Types Of Yogurt Research Articles

Effect of added Bovine Casein and Whey Protein on the quality of Camel and Bovine Milk Yoghurts

The aim of this study is to evaluate the effect of fortification of camel milk (CM) and bovine milk (BM) with 1-4% of bovine casein (CN) and/or whey protein (WP) on the quality of yoghurts after 12 hours of fermentation. Response surface methodology was used to design the experiment. Yoghurts were evaluated for pH, acidity, hardness and rheology. The results revealed that addition of WP and CN significantly improved the hardness (p<0.000), and the rheological properties; storage modulus (G’, p<0.005), and loss modulus (G”, p<0.005), viscosity (p<0.005) and tan δ (G’’/G’, p<0.05) of CM yoghurts. Both types of yoghurts attained highest viscosity, G’ and G” values at highest level of WP (4%) and intermediate level of CN (2.5%) while increased CN ratio showed negative effects on yoghurts rheology. It can be concluded that the amount of total proteins as well as altering CN-to-WP ratio are important for the formation of strong gel network and the production of good quality set yoghurts.

Multiple Emulsions with Extracts of Cactus Pear Added in A Yogurt: Antioxidant Activity, In Vitro Simulated Digestion and Shelf Life.

Consumers demand so-called natural in which additive and antioxidant preservatives are from natural origin. Research focuses in using extracts from plants and fruits that are rich in bioactive compounds such as phenolics and betalains, but these are also prone to interact with proteins and are exposed to suffer degradation during storage. In this work, we developed a fortified yogurt with the addition of betalains and polyphenols from cactus pear extract encapsulated in a multiple emulsion (ME) (W1/O/W2). Different formulations of ME were made with two polymers, gum arabic (GA) and maltodextrin (MD) and with the best formulation of ME four types of yogurt were prepared using different % (w/w) of ME (0%, 10%, 20% and 30%). Bioactive compounds, antioxidant activity, color and lactic acid bacteria (LAB) were analyzed in the different yogurts over 36 days of shelf life. Furthermore, in vitro simulated digestion was evaluated. The yogurts had significant (p < 0.05) differences and the ME protected the bioactive compounds, activity of antioxidants and color. The ME did not affect the viability of LAB during 36 days of storage. The in vitro digestion showed the best bioaccessibilities of antioxidant compounds with the yogurts with ME.

Researching of fatty acids and amino acid structure of yogurts with use of mare’s milk

Mare’s milk is special dietary raw materials with treatment-and-prophylactic properties. The only product released by the industry from mare’s milk in Russia is koumiss. However, koumiss is an alcohol-containing product. There is a problem of processing of mare’s milk on functional fermented milk products. The most popular fermented milk product, among the population, is yogurt. We developed compoundings of two types of yogurt with use of mare’s milk, the patent application is submitted No. 2017117840 RU for one of them of 22.05.2017 “Fermented milk product”. The purpose of work is a research of fatty acids and amino acid structure of new yogurts with use of mare’s milk. For studying two samples of yogurts were made. As raw materials mare’s milk of the Bashkir breed was used. Production and researches of prototypes of yogurt were conducted on the basis of “Bashkir State Agrarian University“(Ufa), the accredited laboratory center FGBUN “FITs food and biotechnologies” (Moscow). The analysis of fatty acids composition of samples of yogurts showed that they have high content olein, γ-linolenic, α-linolenic and arakhidonovy acids. Data on the content of amino acids in yogurts with use of mare’s milk show that they are characterized by the high content of the irreplaceable amino acids proving the high biological value of ready-made products. The research is executed with financial support FBSI “Fund of Assistance to Development of Small Forms of the Enterprises in the Scientific and Technical Sphere” within state. contract No. 1202GS1/21741 of 05.05.2016.

A Consumer Perception Study on Functional Dairy Products Among Consumers in Istanbul, Turkey

The aim of this study is to understand Turkish consumers‘ perception of functional dairy products in three different categories, namely milk, yogurt, and cream cheese, as well as their willingness to buy products with health claims. In this study, 50 untrained participants from the city of İstanbul, Turkey, were enrolled to evaluate three types of milk (calcium &amp; vitamin fortified, soy, and whole), three types of yogurt (probiotic, strawberry flavoured probiotic, and plain) and four types of cream cheese (calcium, phosphate &amp; vitamin fortified, reduced fat, light, and regular) using free listing testing and check-all-that-apply (CATA) questions together with Yes/No questions. Twenty-five participants were recruited from Yeditepe University‘s Food Engineering Department and 25 participants from public places to form two clusters. In the free listing analysis, the number of frequent terms related to health dramatically decreased after the tasting session for all products, whereas sensory related terms became more important. CATA analysis showed that consumers look for different product properties in different dairy categories. The findings of both analyses showed that, regardless of their education and awareness, consumers still are not willing to compromise on the taste of dairy foods independent of how healthy the product might be. Their preference of functional dairy products was only 22%, 26% and 14% for fortified milk, probiotic yogurt, and fortified cream cheese, respectively. Moreover, only 30% of the participants were found to believe the health claims on the package, which is another obstacle the functional food industry has to face.

The effect of the addition of microbial transglutaminase before the fermentation process on the quality characteristics of three types of yogurt

The effect of the addition of microbial TGase to milk on selected physical properties of the final product and the viability of lactic acid bacteria cultures during storage at 6 °C for 56 days was studied. Three types of set-style yogurt were made with varying parameters. Weekly analyses included the determination of syneresis and water-holding capacity, texture, pH, and the lactic acid bacteria population. Our research has confirmed that mTGase may be used to stabilize yogurts, although the syneresis, the water-holding capacity of yogurts, and the textural features of yogurts were dependent on the step in the production process at which mTGase was added to milk. The presence of mTGase had no relevance with regard to the acidity of yogurts stored under refrigerated conditions. The addition of mTGase had no effect on lactobacilli, but had a variable effect on Streptococcus thermophilus, depending on the duration of enzymatic activity.

Effects of Some Stabilizers on the Textural Properties of Yogurt

Abstract: This study was conducted to investigate the effect of various stabilizers on textural properties of set yogurt. Yogurt samples were prepared by using seven various stabilizers such as sodium caseinate, gelatin, carrageenan, xanthan gum, guar gum, locust bean gum and native corn starch. Control group samples were produced without using stabilizer. Textural analysis were made with a TA-XT2i texture analyzer. As a result of the statistical analysis, it was determined that stabilizer and storage time had a significant effect (p&amp;lt;0,01) on all texture parameters of yogurt samples, the relaxation force values were not affected by only storage period (p&amp;gt;0,05). In conclusion, Na-caseinate is the most suitable stabilizer for yogurt texture compared to all stabilizers. These findings may contribute to the selection of stabilizer material or preparation of stabilizer mixtures that can be used in the production of set type yogurt for developing different textural parameters.

Fermented Dairy Foods: Impact on Intestinal Microbiota and Health-Linked Biomarkers.

The intake of fermented foods is gaining increasing interest due to their health-promoting benefits. Among them, fermented dairy foods have been associated with obesity prevention, and reduction of the risk of metabolic disorders and immune-related pathologies. Fermented foods could lead to these health benefits by providing the consumer with both easily metabolizable nutrients and beneficial microorganisms. Our aim was to evaluate the relationship between the consumption of fermented dairy products and the intestinal microbiota, serum lipid profile, and the pro-oxidant/inflammatory status. 130 healthy adults were evaluated. Dietary fermented food intake was assessed by an annual food frequency questionnaire (FFQ), including 26 fermented dairy products. Levels of the major phylogenetic types of the intestinal microbiota were determined by qPCR, and concentration of fecal short chain fatty acids were assessed by gas chromatography. Serum glucose and lipid profile, as well as serum malondialdehyde (MDA), C-reactive protein (CRP), and leptin levels were determined by standardized protocols. Among fermented dairy foods, natural yogurt, sweetened yogurt and matured/semi-matured cheese were the most consumed. While natural yogurt consumers showed increased fecal levels of Akkermansia with respect to non-consumers, sweetened yogurt intake was associated to lower levels of Bacteroides. Serum levels of CRP were also significantly reduced in yogurt consumers. Our results underline the interest in exploring the potential effects of the different yogurt types and the role the microbiota may play in such effects.

Health benefits of yogurt among infants and toddlers aged 4 to 24 months: a systematic review.

Health benefits of yogurt are well documented in adults and older children, but less is known about the effects of yogurt in infants and toddlers (aged 4 to 24 months). The aim of this qualitative systematic review was to assess the effects of yogurt and fermented milk products on the health of infants and toddlers. PubMed was searched for English-language papers. No date restrictions were applied. Randomized controlled trials, observational studies, and prospective cohort studies were included. Systematic or narrative reviews, conference abstracts, and dissertations were excluded. In total, 1624 abstracts were screened, of which 1614 were excluded. Full texts of the remaining 10 abstracts were independently reviewed by both authors, who reached consensus about relevance, methods, findings, quality, and conclusions of the included studies. The included studies (published between 1987 and 2017) were heterogeneous with respect to sample size, study population, and type of yogurt used. Five of six studies showed a positive effect of yogurt consumption on infectious diarrhea. Two studies reported a positive effect on gut microbiota composition. Two cohort studies reported a positive effect on reducing the incidence of atopic dermatitis, one of which also reported a positive impact on food sensitivity. Published evidence, much of it decades old, supports a health benefit of yogurt consumption in infants and children. New short- and long-term studies are needed to better evaluate the impact of yogurt consumption in contemporary settings.

GC-MS metabolomics comparison of yoghurts from sheep's and goats' milk

In this study, the polar metabolite profile of commercial yoghurt samples produced in Sardinia (Italy) from milk of local sheep and goats was studied by GC-MS and multivariate statistical data analysis (MVA). Milks underwent the same manufacturing procedures and yoghurts were analysed one day post-manufacture. Results of discriminant analysis indicated that the two yoghurt types had very different metabolite profiles, with different levels of health promoting compounds. Goats' milk yoghurt was richer in free amino acids, γ-aminobutyric acid, pyroglutamic acid and β-phenyllactic acid when compared with yoghurt produced with sheep's milk. Sheep's milk yoghurt was characterised by higher levels of myo-inositol, N-acetylgalactosamine and N-acetylglucosamine. Comparing yoghurt metabolites with those of the original milk, it was found that goats' milk underwent stronger metabolite changes after inoculum. The comparison between the two yoghurt types gave us a deeper insight on the effects of manufacture on different milks.

Impact of Fat Replacement by Core-shell Microparticles on Set Type Yoghurts: Study of Their Physicochemical, Textural and Microstructural Properties

Background: Core-shell micro and nanoparticles can be used to encapsulate bioactive or functional components and to replace fat content also, since they are able to mimic the organoleptic characteristics of the fat globules. &lt;/P&gt;&lt;P&gt; Objective: The aim of this study was to investigate the effect of replacing milk fat matter by core-shell microparticles in set type yoghurt. &lt;/P&gt;&lt;P&gt; Method: Microparticles were produced by electrostatic deposition of carboxymethylcellulose (CMC) on thermally induced aggregates of &amp;#946;-lactoglobulin (&amp;#946;-lg)n. Laboratory made yoghurts were prepared with: full fat milk (F), low fat milk (L) and low fat milk with CS microparticles (CS). Yoghurts properties (e.g. physicochemical, rheological, textural) were characterized during storage at 4 &amp;#176;C. Trials were also conducted in commercial yoghurts taken as references. &lt;/P&gt;&lt;P&gt; Results: Water holding capacity (WHC) and elastic modulus (G´) of CS yoghurts resulted similar to commercial yoghurts. Color properties (L*, a*. b*) were slightly altered and showed no significant variation upon time. CS yoghurts behaved as a weak gel as indicated by the higher n values obtained from mechanical spectra and by the lower firmness obtained from texture measurements. Important differences were observed in microstructure. CS yoghurts showed homogeneous aspect with large aggregates and empty spaces. Bacterial growth in CS yoghurts resulted similar to low fat yoghurts. &lt;/P&gt;&lt;P&gt; Conclusion: Replacement of milk fat by core-shell microparticles would be feasible giving a final product without major differences, at least instrumentally measurable, to commercial yogurt.

Evaluation of Rheological, Physicochemical, and Sensory properties of Apple fortified Yoghurt

Fruit yoghurt was prepared by adding apple pulp at the rate of 10% (AY1), 20% (AY2) and 30% (AY3) (w/v) respectively into milk. The physico-chemical, sensory and rheological properties of different types of yoghurt were determined. A control (C) was prepared to compare the quality characteristics with apple yoghurt. The pH of the apple yoghurt lies between 3.89-4.01 whereas for control yoghurt it is between 4.14-4.34. The addition of apple pulp lead to decrease the pH, syneresis percentage, viscosity and an increase in total solid (TS), water holding capacity (WHC) of the yoghurt. AY3 revealed the highest WHC (%) whereas the lowest value was observed in case of C. Significant differences (p&lt;0.01) are observed for appearance, color, flavor and mouth feelness of different types of yoghurt. The rheological properties of all the samples were analyzed by using Brookfield rheometer and it was found that all the samples follow pseudo plastic nature by following power law model of viscosity. Flow index for C, AY1, AY2 and AY3were found as 0.57, 0.418, 0.402 and 0.395 respectively. So it can be concluded that Apple yoghurt serves as an excellent food worldwide and can get easily accepted by the consumers.

Short communication: Influence of an aqueous myrrh suspension on yogurt culture bacteria over yogurt shelf life

Myrrh is an essential oil and natural flavoring approved by the US Food and Drug Administration, and it has antibacterial and antifungal activity against pathogens. Our objective was to determine the effect of an aqueous myrrh suspension on Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus counts in peptone solution and yogurt, as well as pH and titratable acidity of yogurt during 5 wk of storage at 1 to 4°C. The myrrh suspension (10% wt/vol) was prepared and incorporated into a pure culture dilution in peptone and into yogurt mix at a 1% (vol/vol) level. A control with no myrrh was also prepared, and 3 replications were conducted. Streptococcus thermophilus were enumerated using Streptococcus thermophilus agar with aerobic incubation at 37°C for 24 h, and Lactobacillus delbrueckii ssp. bulgaricus were enumerated using de Man, Rogosa, and Sharpe agar adjusted to pH 5.2, with anaerobic incubation at 43°C for 72 h. During the 8-h period after inoculation, S. thermophilus and L. delbrueckii ssp. bulgaricus counts in peptone solution at 37°C and 43°C, respectively, were not significantly different in the presence or absence of the aqueous myrrh suspension. Counts of S. thermophilus in yogurt containing myrrh (mean ± SD; 4.96 ± 0.58 log cfu/mL) were not significantly different from those in the control yogurt (4.87 ± 0.39 log cfu/mL). The log counts for L. delbrueckii ssp. bulgaricus in yogurt containing myrrh (5.04 ± 1.44 log cfu/mL) and those of the control (5.52 ± 1.81 log cfu/mL) did not differ, and the counts remained within 1 log of each other throughout 5 wk of storage. The pH of the yogurts containing the aqueous myrrh suspension was not significantly different from that of the control yogurts, and their pH values were within 0.1 pH unit of each other in any given week. Titratable acidity values remained steady around 1.1 to 1.2% lactic acid for both yogurt types throughout the storage period, with no significant differences between them. Yogurt culture bacteria can survive in the presence of a myrrh suspension in yogurt with no significant change in pH or titratable acidity. Therefore, it may be beneficial to add an aqueous myrrh suspension to yogurt.

The effect of apple pomace on the texture, rheology and microstructure of set type yogurt

Valorization of apple pomace (AP) as a novel food ingredient is a promising way to efficiently utilize a rich source of phytochemicals and dietary fibre, while also contributing to reducing food waste. In the present study the physico-chemical and functional properties of freeze-dried AP powder were investigated along with the potential of AP powder as a dairy ingredient with focus on interaction of such a complex matrix with milk proteins under acidification and its consequences on the structure of the dairy gel matrix. The addition of 1% AP (w/w) before fermentation favored aggregation of casein micelles at an early stage of fermentation causing onset of gelation at higher pH (5.9) compared to the control (pH 5.3). However, no such effect was noticed at concentrations of AP up to 0.5%. A significant increase of gel firmness and cohesiveness was observed with increasing AP concentration from 0% to 1% during cold storage (28 days), indicating a reinforcement of the structure of the undisturbed casein gels. Such an effect might be attributed to the gelling capability of pectins and other soluble fibres released from AP into milk as well as the gel structure reinforcement by the insoluble AP particles. Confocal images of the intact casein gels indicate a uniform cellular structure with thick casein strands well interconnected at 0.5% AP concentration, which may be an optimal level of AP for a well-structured set-type yogurt gel under the conditions employed in this study.

Influence of purple basil extract (Ocimum basilicum L.) on chemical composition, rheology and antioxidant activity of set-type yoghurt

Four different types of yoghurt were manufactured using purple basil which was added to milk as water extract or powder forms at levels of 1.0 % and 0.4 % (w/w). Physicochemical and rheological properties, antioxidant capacity, color and total phenolic contents of yoghurt samples were measured during 21 days of storage. None of changes were observed for titratable acidity, pH and hardness parameters of yoghurt samples; however, some changes were observed during storage. The contents for total phenolic compounds and antioxidant activity [2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid diammonium salt (ABTS+*) and 2,2-Diphenyl-1-picrylhydrazyl (DPPH*) values] were dramatically higher in powder-added yoghurt samples than those of its water extract counterparts, while the lowest total phenolics and ABTS+* were observed in control sample during storage. The values for storage and loss modulus were higher in water extract-added samples than powder-added counterparts. In conclusion, no significant effect of the addition of powder or water extract of basil was observed on gross chemical characteristics of yoghurt, while use of basil powder positively contributed to antioxidant activity and changed the rheological behavior of yoghurt gel.

Evaluate the physical, chemical and sensory parameters of probiotic yoghurt during storage

Dairy foods like yoghurt are the main types of food matrices supplemented with probiotic bacteria and they have a beneficial health effects among consumers. In this study, to evaluate the physico-chemical parameters and sensory attributers of probiotic added yoghurts using different concentrations (0%, 0.1%, 0.2%, 0.3% and 0.4%) of probiotic (Bifidobacterium spp). The samples were analyzed for physico-chemical, microbiological, and sensorial properties at a week interval during storage of four weeks. The results showed that, the quality parameters such as total solids, ash, fat, reducing sugar, total sugar, pH and titratable acidity did not show any significant difference (P>0.05) for all types of yoghurt at during the first day of storage . Syneresis was high in 0.4% probiotic added yoghurt (40.73±2.05%) and was lower in without probiotic yoghurt (37.70±1.32%). During the storage period, total solids, total sugar, reducing sugar, pH, and titratable acidity were (p < 0.05) varied among the different types of yoghurt sample. At the end of storage 0.4% probiotic added yoghurt showed higher average value of total solids (21.87±1.40%) and titratable acidity (0.67±0.04%), while yoghurt without probiotic showed higher values of reducing sugar (2.17±0.02%), total sugar (10.72±0.21%) and pH (4.38±0.01). At the end of storage, yoghurt without probiotic showed low value of total solids (15.80±1.93%) and yoghurt with 0.1% probiotic showed low value (0.62±0.02%) of titratable acidity yoghurt with 0.4 % probiotic showed low value of reducing sugar, total sugar and pH. During the storage period, dry matter, ash and titratable acidity increased with increasing concentration of probiotic in the yoghurt. Reducing sugar, total sugar and pH decreased with increasing concentration of probiotic. The high numbers of bacterial colony forming unit was showed during second of weeks of storage than fourth week of storage, which is lower than those without probiotic yoghurt. The sensory evaluation of the produced yogurts revealed the superiority of yogurts with 0.3% probiotic was highly preferred by consumers for their taste and overall acceptability comparison with the other types of yogurt. Finally, yogurts with 0.3% probiotic were more suitable for the consumption.

Anti-diabetic Potency and Characteristics of Probiotic Goat-Milk Yogurt Supplemented with Roselle Extract during Cold Storage

This study aimed to evaluate the anti-diabetic potency by in vitro method and the characteristics of probiotic goat-milk yogurt supplemented with roselle extract during cold storage. The experiment used three treatments namely yogurt, probiotic yogurt, and probiotic yogurt supplemented with roselle extract. Yogurt was stored in cold storage (4 oC) and was evaluated for the characteristics and anti-diabetic potency on days 0, 5, 10, and 15. The anti-diabetic potency was analyzed by a-glucosidase inhibitory activity. The results showed that goat milk in this study had a good quality including fat, SNF, protein, lactose content, density, and freezing point. Roselle extract had anti-diabetic potency with 87.72% inhibition at 25% concentration and also had 13.64% IC50 value. The anti-diabetic potency was affected by the type of yogurt, storage duration, and their interaction (P<0.05). Viscosity and water activity were affected by storage duration (P<0.05), meanwhile titratable acidity and pH value were affected by the type of yogurt. Total lactic acid bacteria were affected by storage duration, and there was an interaction between the type of yogurt and storage duration. In conclusion, probiotic yogurt supplemented with roselle extract had the highest anti-diabetic potency among all treatments with 36.70% inhibition. The inhibitory activity of probiotic yogurt supplemented with roselle extract decreased during 15 days of cold storage. The inhibition was comparable with acarbose at 0.1-0.5 ppm concentration. Physical, chemical, and microbiological characteristics of yogurt in this study were good and could be consumed up to 15 days of cold storage.

국내 시판 호상 요구르트의 품질 특성 분석

요구르트는 전유 또는 탈지유를 유산균으로 발효시켜 신맛과 향미를 강화한 대표적인 유 발효식품으로 최근 유고형분 함량과 유산균 수가 많은 호상 요구르트의 수요가 증가하고 있다. 본 연구는 국내 시판되고 있는 호상 타입의 요구르트 20종을 수집하여 제품의 일반적 특성을 조사하였고, pH, 가용성 고형분, 총산, 점도, 호기성･혐기성 유산균 수를 측정하여 기초자료로 제공하고자 하였다. 원유(100%), 탈지분유(70%), 유청 분말(65%), 유크림(40%)이 주원료로 사용되고 다양한 프로바이오틱 유산균주가 단일 또는 복합균주로 첨가되며, modified starch(60%) 및 sugar(45%)가 주된 첨가당류로 사용되었고, amid pectin(45%)은 물성개선재로 가장 높은 빈도로 사용되었다. 20종의 호상 요구르트 제품 간의 품질 특성을 분석한 결과 pH는 4.18~4.60, 총산도는 0.55~1.30%, 가용성 고형분은 7.10~18.13%, 점도는 183.7~901.0 cP로 나타났으며, 호기성 균과 혐기성 균은 106~108 이상으로 식품공전에서 규정하고 있는 일정 수준인 것으로 나타났다. 제품 간에 차이가 나타나는 이유는 첨가물과 점도조절에 따른 점도 증진제 및 스타터의 차이에 기인하는 것으로 보인다. 본 결과는 다양한 기능성 소재 및 소비트렌드를 반영한 요구르트 개발 품질지표 설정의 주요한 기초자료로 사용될 수 있을 것으로 판단된다.

GOAT MILK MANGO YOGHURTS: PHYSICOCHEMICAL STABILITY DURING OR STORAGE

Abstract Goat milk and regional fruits, like the sword mango, are loaded with nutritional potential which warrant investigation as possible sources of generating income, particularly in the deficient semiarid northeastern regions of Brazil. The aim of this study is to assess the stability of the procedure in the production of processed yogurt with goat milk and sleeve pulp. Five different yogurt formulations were processed using varying concentrations of sucrose (5, 10 and 15%) and mango pulp (4, 5 and 6%). Each type of yogurt had a distinctive flavour attributed to the effect of several factors viz., dry extract, ash, lipids, proteins, carbohydrates, calories, pH, acidity and water content, over a 30-day period, with stabilization being performed every 15 days. In this study, the sucrose concentration was identified as the most significant factor among the various physicochemical parameters. In the storage period a decrease in the pH values, calories, lipids, total dry extract and ash was observed, as well as an increase in the acidity values and carbohydrate and water content, in all the yogurts. Yogurts are amenable to market testing, with potential perspectives of significance for income generation and wise utilisation of the available regional premium constituents, like goat milk and sword mango, whose consumption can act as a healthy and nutritious food supplement.

Production of camel milk yoghurt: physicochemical and microbiological quality and consumer acceptability

The objectives of this study were to make yoghurt from camel milk and determine its physicochemical, microbiological and sensory qualities. The quality of camel milk yoghurt was compared with cow milk yoghurt and all parameters were analyzed following standard procedures. Yoghurt of acceptable consistency was made from camel milk using 1.2% gelatin, 5% bovine skim milk powder, 1.5 ml/L of calcium chloride, 40 ml/L of maple strawberry syrup and 6% yoghurt culture (YF-L811) and by incubating the milk at 42°C for 18 h. The average values for moisture, ash, syneresis, pH, titratable acidity and total solids of camel milk yoghurt were 83.4%, 1.13%, 58%, 4.37, 1.255% lactic acid and 16.7%, respectively. The corresponding values for cow milk yoghurt were 80.6%, 0.71%, 56%, 4.67, 0.865% lactic acid and 19.5%, respectively. The titratable acidity of camel milk yoghurt was significantly higher (P&lt;0.05) than cow milk yoghurt; however, no significant difference was observed between the two yoghurt types for the other parameters. Coliforms were not detected in both yoghurt types. The sensory analysis showed that cow milk yoghurt was more preferred by the panellists than camel milk yoghurt. Production of yoghurt from camel milk using the same procedure as for cow milk yoghurt proved to be difficult. Further research is called for to improve the acceptability of camel milk yoghurt using locally available and acceptable flavouring agents. Research needs to be conducted to optimize the operating parameters and standardize the production procedures of camel milk yoghurt in the future.

Production of camel milk yoghurt: physicochemical and microbiological quality and consumer acceptability

The objectives of this study were to make yoghurt from camel milk and determine its physicochemical, microbiological and sensory qualities. The quality of camel milk yoghurt was compared with cow milk yoghurt and all parameters were analyzed following standard procedures. Yoghurt of acceptable consistency was made from camel milk using 1.2% gelatin, 5% bovine skim milk powder, 1.5 ml/L of calcium chloride, 40 ml/L of maple strawberry syrup and 6% yoghurt culture (YF-L811) and by incubating the milk at 42°C for 18 h. The average values for moisture, ash, syneresis, pH, titratable acidity and total solids of camel milk yoghurt were 83.4%, 1.13%, 58%, 4.37, 1.255% lactic acid and 16.7%, respectively. The corresponding values for cow milk yoghurt were 80.6%, 0.71%, 56%, 4.67, 0.865% lactic acid and 19.5%, respectively. The titratable acidity of camel milk yoghurt was significantly higher (P&lt;0.05) than cow milk yoghurt; however, no significant difference was observed between the two yoghurt types for the other parameters. Coliforms were not detected in both yoghurt types. The sensory analysis showed that cow milk yoghurt was more preferred by the panellists than camel milk yoghurt. Production of yoghurt from camel milk using the same procedure as for cow milk yoghurt proved to be difficult. Further research is called for to improve the acceptability of camel milk yoghurt using locally available and acceptable flavouring agents. Research needs to be conducted to optimize the operating parameters and standardize the production procedures of camel milk yoghurt in the future.