Nonfat Milk Solids Research Articles

Evaluation of Hazelnut Cake Flour for Use as a Milk Powder Replacer in Ice Cream

Hazelnut oil cake, a by-product in the cold-pressing of hazelnut oil, is a rich in valuable nutrients, which makes it a promising option for supplementation or as a raw material in the development of functional products. The aim of this work was to study the influence of partial or complete replacing of skim milk powder (SMP) with hazelnut press cake flour (HPCF) in varying ratios (0%, 25%, 50%, 75%, and 100%) on the physicochemical properties and sensory attributes of milk ice cream. The replacement modified the chemical composition of the ice cream mixture, resulting in a reduction (p < 0.05) of milk solids non-fat (MSNF), protein, and carbohydrates content, while simultaneously elevating the hazelnut content, and total fat content. This modification influenced the rheological characteristics of the ice cream mixtures, leading to an increase in the consistency coefficient from 1.32 to 7.66 Pa sn. Furthermore, a decline in overrun values (from 26.99% to 15.85%), an increase in hardness (from 6881.71 to 23,829.30 g), retarded melting properties, and variations in colour attributes were observed with higher concentrations of HPCF. In the sensory evaluation test, it was found that consumer acceptance was enhanced for the samples with partial substitution of SMP when compared to standard milk ice cream. The findings suggest that a replacement of milk powder with hazelnut cake by up to 75% is achievable, in order to obtain functional ice cream with adequate physicochemical and sensorial qualities.

The use of xanthan gum in a milk-containing ice cream with the whey protein microparticulate

Hydrocolloids of stabilization systems are necessary components in ice cream production. They influence viscosity, stabilization of structural elements and melting rate. Their role is especially important in production of ice cream with the low content of fat and nonfat milk solids. Today, specialized stabilization systems for production of such ice cream are absent. Moreover, when choosing stabilization systems, there are problems of economic character that are linked with an increase in prices on the effective polysaccharide — locust bean gum. The aim of the research was substantiation of the composition of the effective formulation of hydrocolloids using their available variety, xanthan gum, to use in production of milk-containing ice cream (with the reduced content of fat and dry nonfat milk substances). To achieve the best quality indicators, a whey protein microparticulate was introduced into milk-containing ice cream. Based on the synergetic properties of hydrocolloids in terms of dynamic viscosity, the composition of four formulations was determined with the content of xanthan gum of 8.6% (in samples 1 and 2), 16% (in sample 3) and 3% (in sample 4). Ice cream with the complex stabilization system of the trademark Cremodan 334 was produced as a control sample. The following indicators were determined in all samples: dynamic viscosity, viscoelastic characteristics (hardness, adhesion strength, gumminess), melting rate, condition and dispersity of the air phase and ice crystals. All developed formulations were superior to the control sample in terms of viscosity by 1.2–2 times. It has been found that replacement of the kappa-carrageenan fraction with iota-carrageenan in combination with guar gum and xanthan gum in an amount of 50% leads to a decrease in viscosity by 1.3 times. A reduction of visco-elastic characteristics was noted in the samples of hydrocolloid formulations under study. When using iota-carrageenan (samples 2 and 4), a notable reduction of thermal stability of ice cream was revealed in sample 4. Furthermore, a decrease in dispersity of the air phase was observed; the content of air bubbles with a size of 50 µm reduced by almost 30%. Based on the results of the investigations, it has been established that the formulation of hydrocolloids of ice cream sample 1, which consists of mono- and di-glycerides of fatty acids, guar gum, xanthan gum and kappa-carrageenan, allows obtaining a product with technologically necessary quality indicators and the most cream-like consistency.

Technologically important quality indicators of low-lactose ice cream with milk and whey protein concentrates

Protein concentrates have a high biological value and contain significantly less lactose in comparison with dry skimmed milk. The use of protein concentrates in ice cream without the content of non-fat milk solids allows not only making up for protein but also developing the component composition of a product with the low content of lactose. In this regard, the study of technologically significant quality indicators of ice cream with the low content of lactose without non-fat milk solids when using milk and whey protein concentrates is an urgent task. The rheological, microstructural, color and thermostatic characteristics, as well as the oxidative stability of fat of the test samples were determined in the research. It has been found that viscosity decreased by 1.8-2.6 times when using whey proteins. The use of protein concentrates led to an increase in hardness and adhesiveness by 2.2-4.1 and 1.6-5.0 times, respectively, but did not significantly affect the thermal stability. The mass fraction of fat had the greatest influence on these characteristics. The study of color characteristics of ice cream made it possible to reveal a decrease in the yellowness index when using milk protein concentrate. It has been established that color differences in most of the samples were not recognizable to the human eye. The induction period was characterized by the lowest value in the samples with whey proteins, thus indicating a probability of a faster oxidation process in them. The use of protein concentrates did not have a significant effect on ice crystals. The stability of the air phase was significantly reduced when using the whey proteins. A multivariate analysis of the studied samples divided them into the control and the samples containing protein concentrates. Based on the technologically significant quality indicators, the use of milk protein concentrates in the production of low-lactose ice cream is more preferable than the use of whey protein concentrates.

Age-specific composition of milk microbiota in Tibetan sheep and goats

This study investigates the dynamic changes in milk nutritional composition and microbial communities in Tibetan sheep and goats during the first 56 days of lactation. Milk samples were systematically collected at five time points (D0, D7, D14, D28, D56) post-delivery. In Tibetan sheep, milk fat, protein, and casein contents were highest on D0, gradually decreased, and stabilized after D14, while lactose and galactose levels showed the opposite trend. Goat milk exhibited similar initial peaks, with significant changes particularly between D0, D7, D14, and D56. 16S rRNA gene sequencing revealed increasing microbial diversity in both species over the lactation period. Principal coordinates analysis identified distinct microbial clusters corresponding to early (D0–D7), transitional (D14–D28), and mature (D56) stages. Core phyla, including Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria, dominated the milk microbiota, with significant temporal shifts. Core microbes like Lactobacillus, Leuconostoc, and Streptococcus were common in both species, with species-specific taxa observed (e.g., Pediococcus in sheep, Shewanella in goats). Furthermore, we observed a highly shared core microbiota in sheep and goat milk, including Lactobacillus, Leuconostoc, and Streptococcus. Spearman correlation analysis highlighted significant relationships between specific microbial genera and milk nutrients. For instance, Lactobacillus positively correlated with total solids, non-fat milk solids, protein, and casein, while Mannheimia negatively correlated with protein content. This study underscores the complex interplay between milk composition and microbial dynamics in Tibetan sheep and goats, informing strategies for livestock management and nutritional enhancement.Key points• The milk can be classified into three types based on the microbiota composition• The changes of milk microbiota are closely related to the variations in nutrition• Filter out microbiota with species specificity and age specificity in the milk

Effects of supplementing cassava root silage to grazing dairy cows on nutrient utilization, milk production and composition in the tropics.

The current study evaluated the effects of supplementing cassava root silage (CRS) to dairy cows grazing on Megathyrsus maximus cv Mombasa on nutrient intake and digestibility, as well as on milk production and composition. Ten primiparous Girolando cows with average body weight ± (SEM) of 373.45 ± (63.55) kg were used in a replicated 5 × 5 Latin square. Animals were subjected to five treatments: (I) grazing cows without supplementation (WCS); (II) grazing cows provided with 5kg DM of supplement without CRS (0g/kg DM of CRS) or including (III) 260, (IV) 520, and (V) 780g/kg DM of CRS. Statistical analyses were performed using the PROC MIXED of SAS with significance at P < 0.05. Intake of neutral detergent fiber (NDF) and ether extract decreased (P < 0.01), while intake of non-fiber carbohydrates increased (P < 0.01), with increased CRS in the diets. Total DM intake and digestibility of DM, and digestibility of nutritional components were lower (P < 0.03) in WCS animals compared to supplemented animals, except for intake and digestibility of NDF, which was the opposite. Milk yield (MY) and fat corrected milk (FCM), as well as all milk components were unaffected (P > 0.05) by CRS inclusion. In contrast, MY, FCM, protein, lactose, casein, and non-fat milk solids (NFMS) were greater for animals that received supplementation (P < 0.05), compared to animals WCS. Milk fat and total dry extract (TMS) did not differ (P > 0.11) between two groups. In conclusion, CRS may be a potential corn meal replacer in the supplement of dairy cows under tropical conditions.

Молокосодержащее мороженое с усовершенствованным белково-углеводным и минеральным составом

Milk-containing ice-cream is low in fat and non-fat milk solids. To maintain the conventional sensory and technological properties, dry substances have to be restored, including dry milk solids. This article introduces a new formulation of milk-containing ice-cream with an improved protein-carbohydrate and mineral content and the conventional sensory profile. Whey protein concentrates and dry cheese whey served as substitute components. The research involved physical, chemical, microstructural, and thermostatic methods. In the experimental product, 2 % whey protein concentrate and 4 % dry cheese whey brought dry milk solids up to 38 %, which was similar to the control milk ice-cream sample. The dispersion of ice crystals and the thermal and shape stability were also similar to the traditional ice-cream. However, the dynamic viscosity and the temperature of freezer discharge of the experimental mix exceeded those of the control sample by 1.5 times and 0.6 °C, respectively, while the aerating ability and the air-phase dispersion were lower. Whey protein concentrates and dry cheese improved the protein-carbohydrate and mineral composition of the milk-containing ice-cream, as well as made it possible to approximate it to the traditional sensory parameters. A further study is necessary to select flavors that could improve the sensory profile of the milk-containing ice-cream product.

Current state and ways to increase the dairy productivity of camels in the south-western region of the Republic of Kazakhstan

Abstract Increasing the dairy productivity of camels is an urgent task for many countries where these animals are of great importance as a source of dairy and meat. The purpose of the study was to evaluate and select heavy milk-producing camels for breeding by genotyping, studying the genealogical structure, and selecting related groups with high productivity. To achieve this goal, the number of camel herds in the south-western region of Kazakhstan was monitored during 2020–2022 to study their external characteristics, live weight dynamics, and milk productivity. As a result, it was found that in female camels for 12 months of lactation, the average daily milk yields of the Arvana breed were 7.4 kg, with milk yield for lactation of 2682.8 kg of milk, and in the Bactrian breed with average daily milk yields of 5.8 kg of milk, milk yield for lactation was 1186.3 kg. It was also revealed that the herds of Arvana camels have 15 breeders, and the herds of Bactrian camels have 14 breeders, which are characterised by a sufficient number of offspring for selection and breeding to improve the productive qualities of animals. In addition, it was found that in the herds of Arvana camels, the descendants of the breeders of “Tekele-lek”, “Kara-lek”, “Zhana-lek”, “Mayakum-lek”, “Yrys-lek” and “Shilikti-lek”, and in the herds of Bactrian camels, “Bal-bura”, “Kulsary-bura”, “Zhas-bura”, “Taushyk-II-bura”, “Sakon-bura”, “Konai-bura”, and “Kulandy-bura” noted high milk productivity. It was found that in the milk of camels of the Arvana breed, the content of nonfat milk solids was 8.3%, the density was 27.66 g/cm 3 , the acidity was 19 0 T, in the milk of the Bactrian breed, these indicators were, respectively: 8.23%, 27.81 g/cm, 3 and 19 0 T. The results obtained are of great practical importance, as they can be applied to create new methods and technologies for managing camel herds that will help increase their dairy productivity.

Synbiotic Soygurt Tempe Extract as A Functional Drink for Stunting Prevention

Stunting is a chronic malnutrition problem caused by insufficient nutritional intake for a long time due to the provision of food that does not meet nutritional needs. Toddlers with stunting are a chronic nutritional problem which can be caused by many factors, socioeconomic conditions, maternal nutrition during pregnancy, illness in infants, and lack of nutritional intake in infants. Synbiotics (prebiotics and probiotics) as an effective alternative for stunting Analyzing the effectiveness of prebiotic tempeh soyghurt as a functional drink for stunting prevention. The research method is an experimental research including fermenting prebiotic tempeh and prebiotic tempe extract, making prebiotic tempeh soygurt, and analyzing the nutritional content and product quality of probiotic tempeh soygurt referring to SNI 7552:2009 concerning flavored fermented milk including chemical physics analysis, namely the hedonic method organoleptic test, pH, acidity, protein, fat, ash content, fiber, water content and microbiological tests, namely MPN coliform and Salmonella sp. Data analysis used bivariate and multivariate Anova tests. Organoleptic test results for prebiotic soygurt extract of tempeh product with the addition of chitosan (0.5%; 1.0%; 1.5%; 2.0%) using lactic acid bacteria (LAB) inoculum in the rather dislike category (value 3.00) to rather like (value 4.50) . Physical test results showed liquid texture, yellowish color, aroma of tempeh extract, sour taste. Chemical test results (w/b) fat content 3.34%; milk solids 13.19%, non-fat milk solids 9.25%; proteins 0.69%; ash content 0.19%, acidity 0.69% and sugar content 0.59%. Microbiological tests showed MPN coliform &lt;3 cells/100 ml sample and Salmonella sp/25 ml negative results. CONCLUSION: Soygurt extract tempe prebiotic product meets the physical, chemical and microbiological requirements so that it can function as a functional drink for stunting prevention can be concluded that the accuracy of measuring body weight depends on gender.

Effect of carbohydrate level in the diets of Kholmogor cows on milk productivity and milk quality

The effect of the diets with different ratio of easily digestible carbohydrates on milk productivity and milk quality of high-yielding Kholmogor cows during the milking period was studied. The research and production experiment on the cows was conducted in the Arkhangelsk region in 2022. Selection of animals in the control and experimental groups was carried out by the method of pair-analogues under the stall barn system. Two groups of cows participated in the research: experimental and control groups of 10 cows each. The experiment lasted for 100 days. Carbohydrate-protein mixture was used as a carbohydrate supplement to the diets of experimental animals in the amount of 1.5 kg per head per day. Selective milk quality control for mass fraction of fat, protein, lactose, dry matter, milk solids non-fat (MSNF), freezing point, urea and somatic cells were determined on a Bentley Combi 150 high-speed infrared milk analyzer at the Selective Milk Quality Control Laboratory. It was found that the sugar-protein ratio in the experimental group was twice higher (0.58) than in the control group (0.29), due to the presence of carbohydrate supplementation in the diet. The increase in milk productivity of the animals by 4.6 and 0.14% of the protein level in milk at inclusion of carbohydrate-protein mixture in the amount of 1.5 kg per one head per day in the diet was established. A 3.2% decrease in the level of urea in milk was recorded, indicating a more efficient use of amino acids by the animals in the process of metabolism at the same level of absorption of ammonium forms while increasing the level of simple carbohydrates in the diet. The positive effect of this additive on the content of dry skim milk residue, which increased in the milk of the cows of the experimental group by 0.128 absolute % (abs.%), was revealed. Application of the carbohydrate-protein mixture in the amount of 1.5 kg per one head per day and control over the quality of produced products will increase the milk productivity of cows, improve the quality of products, increase the productive longevity of dairy cattle.

Fruit and vegetable purees as cryoprotectants for vacuum freeze-dried fermented milk products

Fresh fermented milk products have a limited shelf life that can be extended by vacuum freeze-drying. Cryoprotectants are used to increase the survival of lactic acid microorganisms during freeze-drying. The most effective cryoprotectants are those of natural origin. Literature offers little information on the cryoprotective effects of fruit and vegetable purees. Therefore, we aimed to evaluate the effectiveness of fruit and vegetable purees in increasing the survival of lactic acid microorganisms during the freeze-drying and storage of fermented milk products. &#x0D; We studied bioyogurt samples containing pumpkin, fig, and banana purees. Rational modes of freezing and freeze-drying were established on the basis of thermal analysis. The cryoscopic temperature was determined by differential scanning calorimetry. The proportion of frozen moisture was calculated using the Nagaoka formula. Standard methods were employed to evaluate the sensory characteristics of bioyogurts and determine their protein, fat, and non-fat milk solids contents, as well as titratable acidity and microbiological indicators. &#x0D; The addition of pumpkin puree increased the cryoscopic temperature and reduced the freeze-drying stage and the total drying time by 13 h, depending on the amount of puree. However, the addition of sweet fig and banana purees decreased the cryoscopic temperature and increased the freeze-drying stage and the total drying time by 0.5–1.5 and 1.5–3 h, respectively. Based on the sensory evaluation of the freeze-dried bioyogurts, we selected the formulations with 15% of pumpkin and fig purees and 10% of banana puree. We found that the freeze-dried bioyogurts with puree had higher counts of lactic acid bacteria compared to the control. In the freeze-dried samples, the counts were higher at a storage temperature of 4 ± 2°C than at 20 ± 2°C. &#x0D; Pumpkin puree provided the best survival of lactic acid microorganisms during freeze-drying and storage.

Dairy productivity of cows of different genealogical lines and the quality of the cheese

Providing the population of the country with high-quality food products of its own production is one of the most important tasks facing the employees of the agro-industrial complex of the country. Milk is such product. It also acts as a raw material for the processing industry, which produces a large range of dairy products, including cheeses. Special requirements are imposed on the milk used for the production of cheeses. Three groups of cows were formed: the 1st without taking into account the belonging to genealogical line (n=60), the 2nd cows belonging to the line Reflection Sovereign 198998 (n=15), the 3rd cows belonging to the line Wes Back Ideal 1013415 (n=15). The groups were formed taking into account age, live weight and milk productivity according to previous lactation by the method of balanced groups. All cows were on the third lactation. According to milk yield for lactation, the cows of the line Refl ection Sovereign 198998 turned out to be the best, according to milk yield for 305 days of lactation, cows of the 1st group (excluding line belonging). According to physic and chemical indicators, milk from cows of the line Refl ection Sovereign 198998 was inferior to milk from herdmates from other groups. Thus, in the milk of cows without taking into account the origin of the genealogical line, high indicators of nonfat milk solids and dry matter were observed, and in the milk of cows of the line Wes Back Ideal 1013415, a high content of fat, protein and lactose was noted. From the point of view of the fat : protein ratio, milk obtained from cows of the 2nd and 3rd groups was more valuable. During the production of Kostroma cheese, milk obtained from cows of the line Wes Back Ideal 1013415 turned out to be more stable, and cheese from this milk also received a high score according to an organoleptic assessment. In order to increase the production of high-quality cheese, it is necessary to pay attention to the breeding of cows of the genealogical line Wes Back Ideal 1013415.

The quality of milk of cows-daughters of different bulls-producers and assessment of its suitability for processing

Relevance. The increase in the productive qualities of dairy cattle continues through the further use of purebred bulls-producers of the Holstein breed both of domestic and offoreign breeding, which invariably leads to an increase in the blood of the Holstein breed. Milk is not only a valuable food product, but also raw material for the dairy industry, and its use for the production of certain products is determined by its technological properties , so the study of them in a new genetic formation of dairy cattle in the Middle Urals zone has both scientific and practical interest.Methods. The research was carried out in one of the typical breeding reproducers for the breeding of Holstein black-and-white cattle of the Sverdlovsk region in the period 2018–2022. The evaluation included first-calf cows that completed the first lactation, obtained and grown on the farm. All cows are descended from breeding bulls Das, Sayan, De-Su, Gavano, Touareg, Marrs, Cassio, Bentley, who all 15 or more daughters. Qualitative indicators of milk— chemical composition, physico-chemical, technological properties and sanitary and hygienic indicators — were evaluated four times in three-fold repetition according to generally accepted methods and techniques in the dairy laboratory of the Ural State Agrarian University.Results. As a result of the conducted research, it was found that the milk of cows-daughters of different bulls-producers differs in chemical composition. In the milk of cows-daughters of bulls-producers Sayan and Cassio, the content of dry matter (DM), nonfat milk solids, protein, and milk sugar is higher. There was a significant superiority of these cows over their peers from other bulls in MJ in milk (Р ≤ 0.001). Milk obtained from cows-daughters of all bulls-producers corresponds to the highest grade. Differences in the technological properties of milk, namely in cheese suitability, were revealed, despite the fact that it was all attributed to the second type, the most suitable for the manufacture of cheeses.

Association of ?-lactoglobulin gene polymorphism with biochemical parameters of blood and qualitative composition of milk of Holstein cattle

The ?-lactoglobulin (BLG) gene, which is responsible for the biological value indicator that affects the ratio of protein fractions, the level composition and technological characteristics of milk presents of considerable interest for dairy cattle breeding. The purpose of our work was to identify the relationship with the polymorphism of the beta-lactoglobulin gene and the biochemical blood parameters and dairy productivity of Holstein cattle. This research was carried out in 2020-2021 on 148 Holstein cows in the Integrated Agricultural Production Centre “Stud farm named after Lenin” of Atninsky district of the Republic of Tatarstan. As an effect of the studies, it was shown that the animal herd is polymorphic in the ?-lactoglobulin gene. Population is represented by three genotypes: AA - 24.3, AB - 47.3 and BB - 28.4%. The frequency of occurrence of alleles A and B was 0.480 and 0.520, respectively. In group of animals with AB genotype of BLG gene in the blood serum was detected an increased content of indicators of protein metabolism (total protein, albumin, ALT) and the minimum level of urea. Cows whit BLG AB genotypes are characterized by an increased mass fraction fat and protein, MSNF (milk solids non-fat) and dry matter. This research was supported by FASO Russia project number: 122011800138-7.

Влияние концентратов сывороточных белков на технологические и органолептические показатели качества мороженого

The demand for protein-fortified foods is increasing, and so is the necessity of the complete utilization of milk constituents in the food industry. The research objective was to study various technological and sensory indicators of ice cream fortified with whey protein concentrate.&#x0D; The study featured ice cream samples with 8% of mass fraction of fat and 10% of nonfat milk solids with whey protein concentrations of 1–5 %. The dynamic viscosity was studied by rotational viscosimetry, dispersion – by microstructural methods, thermal stability – by thermostatic methods, and titratable acidity – by standard methods.&#x0D; Whey protein concentrate in amount of 1–5 % increased the titratable acidity by 1.05–1.90 times and the dynamic viscosity – by 1.16–2.90 times. With an extra addition of 4% whey protein concentrate, the viscosity of the mix exceeded the technologically permissible values. The consistency coefficient increased by 19.4 times, and the flow index decreased by 4.8 times. During freezing, the mix revealed the high capability to air saturation with mass fraction of melt whey protein concentrate of 1 and 2%. Thermal stability also increased: mass fraction of melt after 60 min of retention decreased by 3 times. After adding 1–3% whey protein concentrate, the dispersion of air bubbles and ice crystals improved. It was determined in accordance with the density of distribution by their sizes. The hardness of ice cream decreased 1.4–8.3 times as whey protein concentrate increased. A greater mass fraction of whey protein enhanced the creamy taste and improved the texture. &#x0D; Based on the main technological and sensory quality indicators, the mass fraction of whey protein concentrates should be under 3%. The results may be used in protein-fortified ice cream production.

Zeboid cow milk: physicochemical quality indicator

Introduction. A herd of zeboid cattle was created by the Snegiri Scientific and Experimental Farm (Moscow region, Russia) as a result of long-term selection and crossbreeding zebu (Bos indicus L.) with cattle (Bos taurus L.). These hybrid cows have good physiological parameters, high resistance to diseases, and a significant adaptive potential. The quality of milk produced by zebu cows at different lactation and milking times has not been studied as well as their milking capacity. Therefore, we aimed to assess the variability of specific physicochemical indicators of milk produced by Snegiri’s zeboid dairy herd.&#x0D; Study objects and methods. The milk of 193 zeboid cows (6–12% of zebu blood) from the Snegiri Farm was analyzed by standard methods for quality indicators such as fat, nonfat milk solids, density, bound water, freezing point, protein, and lactose. Then, we determined how these indicators changed depending on the lactation number and the time of milking (morning/evening). Statistical analysis was applied to process the data.&#x0D; Results and discussion. Such indicators as nonfat milk solids, density, bound water, freezing point, protein, and lactose of zeboid cow milk were consistent with the normal indicators for raw cow’s milk. Only its fat content (4.39%) exceeded the norm. We found no correlation between the quality of milk and the number of lactations. However, the evening milk was more concentrated, with a significant increase in nonfat milk solids and density, as well as with a lower freezing point.&#x0D; Conclusion. Zeboid cows, which can be bred in suboptimal conditions, produce milk suitable for dairy products since it has a high fat content regardless of lactation and milking time.

Quinoa flour as a skim milk powder replacer in concentrated yogurts: Effect on their physicochemical, technological, and sensory properties.

Milk standardization with solids (i.e., nonfat milk solids, MSNF) for yogurt manufacture is traditionally achieved by the addition of skim milk powder (SMP). However, the addition of SMP to milk‐based yogurt increases lactose content and decreases both protein content and gel firmness. Thus, in this work, quinoa flour (QF; 0%, 25%, 50%, 75%, and 100% w/w) was used to replace SMP in concentrated yogurt. The physicochemical, textural, and sensory properties and microstructure of the yogurt were evaluated during cold storage. Generally, protein content, water‐holding capacity, and L* value decreased, while syneresis, textural attributes, and viscosity increased with increasing QF content. The substitution of high levels of QF (>25%, w/w) for SMP led to significantly shorter fermentation times, as compared to the control sample. The scanning electron microscopy observations showed significant changes in the yogurt microstructure as a consequence of QF replacement. Samples with 25% (w/w) substitution of QF and control had the highest scores in overall acceptance. According to the results, QF could be applied as an interesting raw material for concentrating the milk‐based yogurt at substitution level of 25% (w/w).

ВЛИЯНИЕ ЧАСТИЧНОЙ ЗАМЕНЫ СОМО КОНЦЕНТРАТАМИ И ГИДРОЛИЗАТАМИ СЫВОРОТОЧНЫХ БЕЛКОВ НА ПОКАЗАТЕЛИ КАЧЕСТВА МОРОЖЕНОГО ПЛОМБИР

The relevance of the research is due to the tendency of using concentrated forms of milk and whey proteins in food products, ice cream in particular, to increase protein content and reduce raw material costs. The purpose of this work was to study the quality indicators of the most produced in Russia Plombières ice cream with partial replacement of milk solids non-fat (MSNF) with whey protein concentrates and hydrolysates. A significant effect of whey protein concentrates and hydrolysates on the dynamic viscosity and air saturation ability of the mixture was found. Compared to the control sample, the viscosity of mixtures with whey protein concentrates decreased by a factor of 2, while the hydrolysates increased by at least 1.5. The ability of the mixture to saturate with air by whipping index decreased by 1.9 and 1.6 times compared to the control, respectively. When using concentrates, the average diameter of air bubbles increased by 1.23–1.26 times compared with control. The negative effect of whey protein hydrolysates on thermal stability and positive effect on ice crystal dispersion was noted. The fraction of float after 60 min of incubation was 16%, while it was absent in the control, and the average size of ice crystals was larger, 1.4 times larger, than in the control. Whey protein concentrates and hydrolysates, when partially replacing milk solids nonfat in ice cream, affect the dynamic viscosity of the mixture, the beatability and thermal stability of the product, as well as the dispersion of the air phase and ice crystals. In this regard, the research results will be useful in the development of industrial ice cream technologies with their use. The article was prepared within the framework of research under the state assignment of All-Russian Scientific Research Institute of Refrigeration Industry – branch of V.M. Gorbatov Federal Research Center for Food Systems of Russian Academy of Science.

Economic and zoological rationale for using new bedding material for lactating cows

This article examines the influence of the studied bedding material, which is dust-free wood shavings, cleaned from metal impurities and processed by thermochemical and biotechnological methods on the productivity of cows, the sanitary and hygienic quality of milk and the profitability of the products obtained. The production experience was carried out in the conditions of one of the farms of the Republic of Tatarstan on cows of the Holstein-Friesian breed and lasted for 3 months. To assess the quality of milk, the following indicators were taken into account: the amount of fat, protein, lactose, dry matter, non-fat milk solids, urea, somatic cells, as well as acidity, freezing point, pH, analysis for ketone bodies. The milk production was calculated based on the results of the control milking. Our studies have shown that, from an economic point of view, the use of the investigated bedding material is most effective.

Microcapsules Consisting of Whey Proteins-Coated Droplets of Lipids Embedded in Wall Matrices of Spray-Dried Microcapsules Consisting Mainly of Non-Fat Milk Solids.

The effects of wall composition and heat treatment on the formation and properties of core-in-wall emulsions (CIWEs) consisting of whey protein-coated milkfat (AMF) droplets and a dispersion of non-fat milk solids (MSNF) were investigated. Microcapsules were prepared by spray drying these CIWEs. The d3.2 of the CIWEs ranged from 0.36 to 0.54 μm. Surface excess of the CIWEs ranged from 1.39 to 6.57 mg/m2, and was influenced by concentration of whey proteins and heat treatment (30 min at 90 °C). Results indicated a preferential adsorption of β-lg at the O/W interface. Whey proteins accounted for up to 90% of the proteins adsorbed at the O/W interface. The core retention during spray drying ranged from 90.3% to 97.6% and microencapsulation efficiency ranged from 77.9% to 93.3%. The microcapsules exhibited an excellent long-term oxidative stability at 20 and 30 °C that was superior to that of microcapsules consisting of milkfat and MSNF, where the O/W interface was populated mainly by caseins. The superior oxidative stability could be attributed to the formation of dense whey-proteins-based films at the O/W interfaces of the CIWEs that isolated the core domains from the environment. The results open new opportunities in developing highly stable lipids-containing microcapsules and dairy powders.

Ice cream and frozen desserts nutrient compositions: current trends of researches

The current state and new research trends of creating functional ice cream and frozen desserts are considered in the article. Attention is paid to the difference between the characteristics of ice cream regulated by the term in the countries of European Union and Eurasian Union. Taking into account that ice cream and frozen desserts are multicomponent products, the correction of their composition may have different effect on their quality indices. In particular, replacing sucrose by substitutes can lead to a change of traditional taste, consistency and structure. In this connection, aspects of the usage of sucrose substitutes by sweetness (glucose-fructose syrup, processed fruit products, stevia, sucrolose) and by dry matter (food fibers and polyols) are considered. In particular, the authors of researches note that the application of polyols changes the ice cream consistency to be firmer. The researchers pay attention to the impact of some components, introduced into ice cream and frozen desserts, on the cryoscopic temperature of mixture. The enrichment of ice cream and frozen desserts with pro- and prebiotics and application of milk with the increased nutritional value (sheep and goat milk) has been noted to be a trend in research. The attention is drawn to the practical use of enzymes. For people with lactose intolerance, the reason of which in ice cream is Nonfat milk solids (MSNF) it is proposed to hydrolyze it by different methods. In this review the experience of some scientists on the use of transglutaminase enzyme for changing properties of milk proteins, in particular, increasing their water- holding capacity is reflected. Researchers pay great attention to the increasing of nutritional value of ice cream and desserts by growth of mass fraction of protein and introduction of easily digestible proteins (concentrates of whey proteins, including the hydrolyzed proteins). Taking into consideration the growth of people who do not consume products of animal origin, some researches on replacement of milk protein to vegetable one, in particular, soy are noted.