Acid Degree Value Research Articles

Effects of free and encapsulated Siah-e-Samarghandi grape seed extract on the physicochemical, textural, microbial, and sensorial properties of UF-Feta cheese.

The current study was conducted to elucidate the impact of grape seed extract (SE) and microencapsulated seed extract (MSE) addition to UF-Feta cheese. The SE was encapsulated in maize starch, alginate, and canola oil using the emulsion technique. The SE and MSE characteristics were evaluated. The products were subjected to physicochemical (pH, titrable acidity, color, texture, and sensory properties), microbiological analysis (starter count), and lipid oxidation test (proxide, acid degree, and ansidine value) during 60 days of storage. The main phenol component in the SE was catechin (419.04 mg/L), gallic acid (319.63 mg/L), and chlorogenic acid (4.19 ± 0.002 mg/L). The antioxidant value was 157.80 mg/L. The MSE was elliptical in shape with a 24.29 μm diameter. The efficiency of microencapsulation was 53.86%. The addition of SE and MSE had no significant effect on pH and acidity, but lipolysis decreased based on acid degree value (0.7%; p > .05). The increasing trend of peroxide values was 172.54%, 145.68%, and 118.75% for C, SE, and MSE samples, respectively, and 35.68%, 32.28%, and 17.24% for the P-anisidine values during the storage time. Therefore, fat oxidation was reduced in the supplemented cheese. Nevertheless, the supplemented cheese had limited color alterations. The MSE and SE did not affect the survival rates of the starter count. The SE and MSE had a less rigid structure. The hardness (2748.0 g) and chewiness (57.45 mJ) values in SE cheese had the greatest value among the samples. All sensory parameters were lowest in MSE cheese. In short, encapsulation showed suitable properties for SE to apply in UF-Feta cheese.

Physicochemical properties of kashk supplemented with encapsulated lemongrass extract

Kashk is a perishable fermented dairy product. Since chemical preservatives are harmful for human health, we aimed to study lemongrass (Cymbopogon citratus L.) as a natural preservative.
 First, we assessed the phytochemical properties of lemongrass extract. Then, we added lemongrass extract and microencapsulated lemongrass extract to kashk samples. Finally, we analyzed their physicochemical and sensorial properties during 60 days of storage.
 Catechin (419.04 ± 0.07 mg/L), gallic acid (319.67 ± 0.03 mg/L), and chloregenic acid (4.190 ± 0.002 mg/L) were found to be the predominant phenolic constituents in lemongrass. Total phenolics, total flavonoids, and antioxidant activity (IC50) values of the lemongrass extract were 26.73 mg GA/g, 8.06 mg Quercetin/g, and 2751.331 mg/L, respectively. The beads were spherical in shape with a 35.03-nm average particle diameter and 47.81% microencapsulation efficiency. The pH of the supplemented kashks decreased during the storage time. They showed lower acid degree values than the control at the end of storage. The peroxide, p-anisidine, and thiobarbituric acid values of the sample fortified with microencapsulated lemongrass extract were 6.15, 4.76, and 44.12%, respectively, being the lowest among the samples. This kashk sample had the highest hardness (570.62 ± 21.87 g), adhesiveness (18.10 ± 4.36 mJ), and cohesiveness (0.56 ± 0.25) but the lowest chewiness (72.66 ± 3.08 mJ) among the samples. It also had a better sensory profile than the control samples.
 Our results indicated that microencapsulated lemongrass extract could be incorporated into kashk to ensure suitable sensorial and textural properties. Furthermore, it may delay fat oxidation and lipolysis during storage.

Evaluation of the impact of hydrogen-rich water on the quality attribute notes of butter.

The effects of washing raw butter with hydrogen-rich water (HRW), prepared with hydrogen (H2) and/or magnesium (Mg), on butter quality were investigated in this research paper. During the washing process, titratable acidity (TA) decreased by 12% for all washed samples. During the storage period, TA increased by 28% and 93% (control), 14% and 58% (H2), and 10% and 66% (Mg) for the 60th and 90th days, respectively. Peroxide value (mEq O2/kg) increased to 2.76 and 8.83 (control), 1.92 and 7.25 (H2), and 2.02 and 8.12 (Mg) for the 60th and 90th days. HRW samples showed the lowest acid degree value (ADV) and the highest color notes (L*, C*, and h). The HRW treatment of raw butter has shown improving effects on the product without any harmful residuals in the final product or the environment.

The Quality and Composition of Iranian Low-Salt UF-White Cheese

In cheese, the reduction of salt is still a challenging task, as sodium chloride exerts multiple and fundamental functions. Salt favors the drainage of the residual whey; enhances the taste and the aroma profile; regulates the texture, the final pH, and the water activity; and affects the microbial growth. Hence the impact of partial replacement of NaCl by KCl on the ripening characteristics of Iranian UF (ultrafiltration) cheese during storage was monitored. To produce low-salt cheese, different mixtures of UF white cheese were treated with NaCl : KCl ratios of (a) 3% NaCl (control), (b) 1.50% NaCl+1.50% KCl, (c) 1.00% NaCl+2.00% KCl, and (d) 0.75% NaCl+2.25% KCl by dry salting. ADV (acid degree value) results showed significant differences ( P < 0.05 ) in all treatments after 15, 30, 40, and 50 days of ripening. No significant differences were observed in the GC (gas chromatography) results in the samples’ free fatty acid (FFA) profile except for C18 : 0 in all treatments. KCl did not affect the moisture, dry matter, fat, TN (total nitrogen)/dry matter, and WSN (water-soluble nitrogen) contents of cheeses considerably. The evaluation of force to fracture showed that there were significant differences ( P < 0.05 ) between treatment (d) as a control cheese and treatments (b) and (c). Sensory evaluations showed as the concentration of KCl increased, the cheese gradually became less acceptable and treatments with higher potassium chloride content were crumblier and less firm. Results of the aroma evaluation of cheese samples showed that unlike acetaldehyde, ethanol, acetoin, and diacetyl amounts decreased significantly ( P < 0.05 ) during the storage period. Results also indicated that a reduction of sodium by up to 50% did not significantly affect the quality and composition of Iranian low-salt UF-white cheese except for sensory evaluation, texture analysis, and aroma characteristics.

Effect of the Application of Cold Plasma Energy on the Inactivation of Microorganisms, Proteins, and Lipids Deterioration in Adobera Cheese

Cheeses are perishable foods that must fulfill sanitary and quality requirements according to the parameters established globally. Plasma as a nonthermal inactivation technique has been a current research topic for food preservation, so the objective of this work was to study the effect of plasma energy against microorganisms in Adobera cheese (traditional Mexican cheese) as well as evaluate the possible degradation of lipids and protein. 108 CFU/mL of Escherichia coli ATCC 25922, Salmonella ATCC13076, and Staphylococcus aureus ATCC 6538 were inoculated at 0.5 g of Adobera cheese and were subjected to an energy of 30 volts, in a dielectric barrier discharge reactor (DBDR) at intervals of times 1, 3, 5, 7, 10, and 15 min. A flow of a mixture of air and helium at 96% purity was used. The decimal reduction time (D) was determined, and the oxidation of proteins and lipids was analyzed after each treatment. The results showed an annihilating effect of plasma on the indicator bacteria under study, and a reduction of 5 logarithmic cycles was obtained. The maximum degree of lipid oxidation was 23 acid degree values (ADV) after 7 min of exposure to plasma. The oxidation of proteins showed a direct and proportional relationship between the formation of carbonyl groups with the percentage significant loss to the concentration of carbonyl groups with the concentration of protein oxidation, after 3 min of exposure to cold plasma levels of 82% and 99% oxidation of Adobera cheese protein and free casein, respectively. We conclude that the plasma energy applied to Adobera cheese is an effective treatment to inactivate bacteria. However, there is the possibility of causing changes in taste and odor, due to the release of fatty acids and the oxidation of proteins.

Effect of microencapsulated chavil (Ferulago angulata) extract on physicochemical, microbiological, textural and sensorial properties of UF-feta-type cheese during storage time

Abstract Chavil (Ferulago angulata) extract (CE) and microencapsulated chavil extract (MCE) were added to UF- Feta-type Cheese. The aim of this study was to comprising CE and MCE on physicochemical and microbiological properties in cheese. The scanning electron microscope images demonstrate the MCE had elliptical shape. The average size diameter curve of the MCE revealed bimodal distribution with two peaks (1541 and 2222 nm) separately. The hardness value of MCE cheese (212.83 ± 17.63 g) was lower than that of CE (343.67 ± 25.53 g) because of canola oil used in the microencapsulation process. The MCE-cheese showed lower values of acidity (1.67%) in comparison with CE-cheese (1.87%). The viable numbers of Streptococcus thermophilus and Lactococcus lactis were equal among the samples (4.6–4.9 log10 CFU/g respectively). The acid degree value of MCE (2.07 ± 0.21%) and CE (1.83 ± 0.25%) cheese were nearly equal at the end of storage time.

Storage stability of yoghurts enriched with coriander (Coriandrum sativum l.) seeds extract

This study was aimed to estimate the effects of the extract of coriander seed during storage on the chemical and sensory properties of yoghurt. Coriander seed extract was incorporated into yoghurt at different concentrations, 18 mg/mL (T1C1), 36 mg/mL (T2C2) and 54 mg/mL (T3C3) respectively, while control was performed using a sample without extract (T0C0). Samples were stored at 4°C for 42 days and every seven days were evaluated. For all samples containing extract, the values of lactose, fat, pH, protein, tyrosine, acid degree value, acid value, free fatty acid and sensory properties gave higher scores than those of yoghurt without extract. A major deterioration beyond 28 days of storage due to high acidity and an unpleasant taste was discovered by chemical and sensory evaluations of the yoghurt without plant extract. On the other hand, concentrations of 18, 36 and 54 mg/mL had shown to have a remarkable 42-day preservation activity in yoghurt. Compared to formulas T1C1 and T2C2, which contained 18 mg/mL and 36 mg/ mL respectively, formula T3C3, fortified with coriander seed extract at 54 mg/mL, had the highest value in maintaining the chemical properties of yoghurt after 42 days. The findings indicated that coriander extract can be applied as a natural food preservative to milk products in order to increase stability during storage.

DETERMINATION OF THE FACTORS THAT CAUSE BITTERNESS DURING SHELF-LIFE IN WHITE CHEESE PRODUCED USING ULTRAFILTRATED MILK

This study aimed to determine the causes of bitterness problems in white cheese produced by ultrafiltration (UF). To investigate the association between the bitterness with the enzyme use or by the starter culture, white cheese was produced using UF-pasteurized and UF-raw milk with two different coagulating enzymes and two starter cultures with different proteolytic activities. Sensory analysis, protein, water-soluble nitrogen, 12% trichloroacetic acid-soluble nitrogen, 5% phosphotungstic acid-soluble nitrogen and acid degree values were determined on day 1, 30, 60 and 90 of the ripening periods. During the ripening process, bitterness was determined in the cheese samples due to proteolysis. The A cheese sample, which was produced using chymosin enzyme and a starter culture with high proteolytic activity, was determined to be the sample with the highest bitterness level in the sensory analyses, SDS-PAGE electrophoresis and HPLC analysis. 72.26% αs-casein hydrolysis was determined in the A cheese sample. According to HPLC results, a high hydrophobic peptide formation was determined with the increase in the area of hydrophobic peptides with a rate of 106% between 40 and 60 minutes.

Optimizing the acceleration of Cheddar cheese ripening using response surface methodology by microbial protease without altering its quality features

Cheddar cheese proteolysis were accelerated employing Penicillium candidum PCA1/TT031 protease into cheese curd. In the present study, several of the significant factors such as protease purification factor (PF), protease concentration and ripening time were optimized via the response surface methodology (RSM). The ideal accelerated Cheddar cheese environment consisted of 3.12 PF, 0.01% (v/v) protease concentration and 0.6/3 months ripening time at 10 °C. The RSM models was verified to be the most proper methodology for the maintain of chosen Cheddar cheese. Under this experimental environment, the pH, acid degree value (ADV), moisture, water activity (aw), soluble nitrogen (SN)%, fat and overall acceptability were found to be 5.4, 6.6, 35%, 0.9348, 18.8%, 34% and 13.6, respectively of ideal Cheddar cheese. Furthermore, the predicted and experimental results were in significant agreement, which confirmed the validity and reliability of the suggested method. In spite of the difference between the ideal and commercial Cheddar cheese in the concentration of some of amino acids and free fatty acids, the sensory evaluation did not show any significant difference in aroma profile between them.

Effect of vegetable fat on the texture, colour and sensory properties of Macedonian white brined cheese

This study aimed to investigate the influence of substitution of milk fat with palm fat on the composition, yield and technological quality of White cheese, a Macedonian traditional cheese. In this study, full-fat white brined cheese was used as a control sample (WC), while experimental cheeses were prepared from cow milk with vegetable fat (WV) addition and low-fat cheese (WL), respectively. The cheeses have been analysed for physicochemical (acidity, pH, fat, fat acidity, protein), instrumental texture and colour properties (L, a, b) as well as the sensory properties after 1, 20 and 60 days. WV cheeses showed a significantly (P<0.05) lower degree of pH and higher titratable acidity than the WC and WL cheese samples. Cheese that contained vegetable fat showed lower degrees of lipolysis, as assessed by the acid-degree value and received significantly (P<0.05) better appearance, highest hardness value (5226.98 N) and cheese yield scores compared to other samples.

Extended Storage of Yoghurt by Using Water Extract of Coriander Seeds

The objective of this study was to evaluate the effects of coriander seed extract on the chemical and sensory properties of yoghurt during storage. Coriander seed extract was incorporated in yoghurt at different concentrations, 18 mg/ml (T1C1), 36 mg/ml (T2C2), and 54 mg/ml (T3C3), while a sample without extract (T0C0) was used as a control. Samples were stored at 4°C and were assessed every seven days. The values of lactose, fat, pH, protein, tyrosine, acid degree value, acid value, free fatty acid, and sensory properties for all samples containing extract give higher scores than those of yoghurt without extract. Chemical and sensory evaluations of the yoghurt without plant extract revealed a significant degradation beyond days 28 of storage due to high acidity, and an unpleasant flavour. By contrast, the concentrations of 18, 36 and 54 mg/ml, were shown to have remarkable preservation activity in yoghurt at 42 days. The formulation T3C3, fortified with coriander seed extract at 54 mg/ml, had the highest value in preserving the chemical properties of yoghurt after 42 days, compared with formulas T1C1 and T2C2, which contained 18 mg/ml and 36 mg/ml respectively. Results suggest that coriander extract can be added to dairy products as a natural food preservative, to improve stability during storage.

Effects of different starter cultures on the ripening characteristics of Golot cheese

PurposeThe purpose of this study was to investigate the chemical, textural and sensory properties of some starter cultures fruit-added Golot cheese.Design/methodology/approachSix types of Golot cheeses were produced in this study. While the control sample contained no starter cultures, five different starter culture combinations (GS1: Streptococcus thermophilus, Lactococcus lactis subsp. cremoris, L. lactis subsp. lactis and Lactobacillus bulgaricus; GS2: S. thermophilus and L. bulgaricus; GS3: S. thermophilus; GS4: S. thermophilus and Lactobacillus helveticus; and GS5: S. thermophilus, L. lactis subsp. cremoris and L. lactis subsp. lactis) were applied to the other cheese samples using an immersion technique. Then, all cheeses were vacuum-packed and ripened at 4 ± 1°C for three months and their chemical, biochemical, sensory and textural analyses were performed on the 2nd, 15th, 30th, 60th and 90th days of ripening.FindingsResults indicated that generally starter cultures have positive effects on the chemical, biochemical and sensory properties of Golot cheese. Considering the final values, the addition of starter cultures enhanced the ripening index of Golot cheeses (8.4%–9.2%), except the GS3 (7.4%), compared to the control (8.1%). At the end of the ripening period, meltability values of GS4 (16.5 mm) cultured cheeses were higher than those of other cultured cheeses (13.0–15.5 mm) and control cheese (14.5 mm). While lipolysis values were low in fresh cheese, it increased during ripening. Overall, GS3 (2.46 acid degree value [ADV]) and GS4 (2.40 ADV) had the highest lipolysis rate, while GS1 (2.14 ADV) had the lowest (p = 0.07). Electrophoretograms indicated that the highest fragmentation of α- and ß-casein occurred in GS5 (48.43%) and GS1 (44.24%), respectively. Also, GS5 was the most appreciated and preferred cheese in terms of sensory. Regarding texture, hardness, cohesiveness, adhesiveness, springiness and gumminess values were determined to be statistically important in terms of ripening time and cheese variety (p < 0.01).Originality/valueConsequently, all starters had a positive impact on Golot cheese samples and among all S. thermophilus and L. helveticus starter were determined to be the most applicable one considering ripening, texture, sensory and melting properties.

Effect of cold and frozen temperatures on artisanal goat cheese containing probiotic lactic acid bacteria isolates (Lactobacillus plantarum TW14 and Lactobacillus rhamnosus TW2).

Aim:The research was conducted to determine the effect of temperature and storage duration on the physicochemical, lipolytic, microbiological, and proteolytic characteristics of goat cheese made using Lactobacillus plantarum TW14 and Lactobacillus rhamnosus TW2 bacteria.Materials and Methods:The cheese was stored at 4°C and −20°C for 0, 15, 30, 45, and 60 days. Observations were made on its physicochemical, lipolysis, and microbiological characteristics. The proteolysis pattern was measured with sodium dodecyl sulfate-polyacrylamide gel electrophoresis.Results:The protein, fat, ash and total solids levels of cold-stored cheese were higher than the frozen-stored one. The frozen-stored cheese’s free fatty acids (FFA) and acid degree value (ADV) levels are lower than those of the cold-stored cheese as indicated by the partial lipolysis event. The total yeast in the frozen-stored cheese is lower than that in the frozen-stored cheese. Finally, the electrophoresis profile indicates that proteolysis of the frozen-stored cheese is formed since there have been detected αs1-casein, αs2-casein, β-casein, and κ-casein in the casein breakdown during the 60-day storage.Conclusion:The physicochemical characteristics of cold-stored cheese are better than the cheese stored at frozen temperature. However, frozen-stored cheese produces lower FFA and ADV than cold-stored cheese and lipolysis occurs only partially.

Исследование влияния состава посолочных смесей на процесс окисления липидов мясных систем

Lipids are the most unstable substances that take part in oxidation process in meat and meat products. Table salt (sodium chloride) which is considered as a pro-oxidant factor has significant effect on the development of meat products oxidative deterioration. The main objective of the research was to study the effect of curing mixture compositions which have low sodium content on the intensity and dynamics of lipids oxidation process in model systems, raw meat and final products during storage. Semi-smoked sausages were taken as an example. The author studied curing mixtures in which 30% of sodium chloride was replaced with one of the following components: potassium chloride, calcium chloride, magnesium chloride. Compositions included potassium chloride and calcium chloride at the ration of 1 to 1, mixture of sodium chloride with yeast extract. The results of the study of the oxidation process in model systems and meat systems with different curing mixtures conform to each other which shows that the mixtures which contain potassium chloride, magnesium chloride and composition of potassium chloride and calcium chloride help slow down oxidation process. According to the results of semi-smoked sausages organoleptic analysis, which were cooked using different curing compositions, the traditional characteristics of the product are obtained when one uses curing mixture which consists of 70% of sodium chloride and 30% of potassium chloride and calcium chloride composition. The dynamics of changes in acid-degree value, peroxide value and thiobarbituric value during semi-smoked sausage storage cooked using that curing mixture indicates that lipid fraction oxidation process stabilizes.

Evaluation of Correlation between Acid Degree Value and Peroxide Value in Lipolysis of Control and Iron Fortified Caprine Milk Cheeses during 4 Months Storage

Elevation of acid degree values (ADV) and peroxide value (POV) indicates deterioration of nutritional and sensory qualities of dairy products during storage. Iron fortification in bovine milk cheeses in relation to lipolytic parameters and their correlations have been studied, while no such studies have been reported on caprine milk cheeses. The objectives of this study were to evaluate levels of ADV and POV of iron fortified [regular ferrous sulfate (RFS) and large microencapsulated ferrous sulfate (LMFS)] goat milk Cheddar cheeses compared to those of non-fortified control cheese (CC) and their correlations. Three batches of 3 types (CC, RFS and LMFS added) of goat milk cheeses were manufactured and stored at two temperatures (4°C and -18°C) for 0, 2 and 4 months. Iron was supplemented to RFS and LMFS cheeses by 8.23 g and 9.03 g per 9 kg, respectively. ADV and POV were determined using standard methods of examining dairy products (Richardson, 1985) and AOCS (1975) procedures. Results showed that ADV values for CC, RFS and LMFS cheeses for 0 and 4 month storage at 4°C were: 0.67, 0.73, 0.64; 1.24, 1.78, 1.58, respectively, indicating significant (P < 0.05) elevations occurred in ADV for all three cheeses during 4 months storage. The cheese samples at 4 months storage showed significantly (P < 0.05) higher peroxide values compared to 0 and 2 month stored ones. The samples stored at refrigeration temperature (4°C) revealed slightly more lipid oxidation than those stored at frozen temperature (-18°C). Significant (P < 0.05) elevations in POV for all goat cheeses stored for 4 months and slight increases in POV at higher temperature implies that the longer time and higher temperature storage can elevate the rate of lipid oxidation in goat milk Cheddar cheeses. Correlations (r) between ADV and POV for the pooled data of three types of the caprine cheeses across storage periods were significant (P < 0.01), while r values of CC cheeses alone were negative. It was concluded that significant correlations exist between extents of lipolysis and lipid oxidation in the caprine milk Cheddar cheeses during 4 months storage.

Short communication: Chemical-sensory and volatile compound characterization of ricotta forte, a traditional fermented whey cheese

Ricotta forte is a traditional whey cheese, obtained through natural fermentation of fresh ricotta, that is getting increasing attention by food traders. In view of possible initiatives for its valorization, the chemical and sensory characteristics were investigated. Samples were obtained from 14 different manufacturer, and were subjected to chemical, biochemical, volatile organic compound, and sensory analyses. All samples presented low pH with high moisture (62-66%) and fat content (57-60% on dry matter). From a biochemical point of view, the electrophoretic patterns evidenced that β-lactoglobulin was the main protein present at all sample ages. Only intermediate levels of proteolysis (20.69% ripening index) took place during aging, whereas the main biochemical event in this dairy product was lipolysis (2.10 mEq/g of acid degree value). Accordingly, free fatty acids dominated the volatile organic compound profile and strongly influenced the sensory characteristics with flavor described as rancid, pungent, acrid, and smelly feet: all associated with short-chain fatty acids such as acetic, propionic, butyric, and caproic. Finally, the sample age did not influence chemical composition, whereas it had significant effect on lipolysis and flavor intensity.

Characterisation of Urda whey cheese: Evolution of main biochemical and microbiological parameters during ripening and vacuum packaged cold storage

In this study, the main biochemical and microbiological characteristics of Urda, a traditional Greek whey cheese, were determined during ripening at 19 ± 2 °C for 25 days followed by vacuum packaging and storage at 5 °C until day 360. Few differences in pH, water activity, acid degree value, moisture, salt, protein and fat contents were observed between Urda cheeses produced from sheep or goat milk whey at all sampling days (1, 25, 90, 180 and 360). Cheese microbiota was dominated by mesophilic lactic acid bacteria, but high numbers of enterococci, aerobic gram-negative bacteria and Enterobacteriaceae were also present. Increases in all the soluble nitrogen fractions of cheeses occurred, primarily during cold storage. Ketones and terpenes were the most abundant volatile compounds in fresh (1-day) sheep and goat cheeses, respectively, whereas free fatty acids were the most abundant compounds in mature (180-day) cheeses, followed by ketones.

Cholesterol Concentrations and Lipolytic Characteristics of Commercial Bovine and Caprine Milk Yogurts during Four Weeks Refrigerated Storage

Yogurt is a popular cultured dairy product in many countries, while few studies have been reported on cholesterol concentration and lipolytic property of goat milk yogurt. The purposes of this study were to quantify cholesterol contents of commercial bovine and caprine milk yogurts produced in the US, and compare differences in lipolysis between the two species products during 0, 2 and 4 weeks storage at 4oC. Three batches each of commercial cow milk yogurt (CCY) and commercial goat milk yogurt (CGY) were purchased from local retail stores. All experimental yogurt samples were subjected to analyses of cholesterol, basic nutrients, pH and acid degree value (ADV) using AOAC procedures. Cholesterol content was quantified by GC-17A (Shimadzu Scientific, Inc., Columbia, MD) equipped with a fused silica capillary column (HP-5, 30 m × 0.32 mm inner diameter × 0.25 μm thickness) and FID detector. The respective mean (%) of protein, fat, ash, carbohydrates and total solids of the CGY and CCY were: 3.25, 3.69; 2.97, 2.83; 0.847, 0.777; 4.19, 4.89; 11.95, 11.49, indicating that the CGY contained higher fat, ash and total solids, and lower protein than those of the CCY. The higher carbohydrates, ash and total solids in the CGY accounted for the supplementation of tapioca and pectin in the caprine product. Cholesterol contents (mg/100 g) of the CGY and CCY for 0, 2 and 4 weeks storage were: 19.8, 18.4; 20.3, 17.9; 22.0, 19.7, respectively, showing that CGY contained slightly higher cholesterol than CCY throughout the storage periods. It was concluded that the caprine yogurt contained slightly higher fat and cholesterol than the bovine counterpart, which was unexpected because goat milk is known to contain lower cholesterol than cow milk. The differences in lipolysis between CGY and CCY during the 4 weeks storage were minimal.

Volatile compounds, chemical and sensory properties of butters sold in Çanakkale

The aim of this study was to determine physical, chemical and sensory properties and volatile components of butter samples sold in Canakkale. For this purpose, color, viscosity, refractive index, melting point, moisture (%), total acidity (%), acid degree value and fat content (%) of the samples were determined in eleven butter samples. Volatile compounds were identified by gas chromatography-mass spectrometry. Sensory properties of samples were determined by Spectrum TM method. There were significant differences among butter samples in terms of physical, chemical and sensory properties. Viscosity, refractive index, melting point, moisture, total acidity and fat content of the samples ranged between 45.40-62.0 cP, 1.3331-1.4672, 32.50-37.50 ˚C, 15.03-19.06%, 0.24-0.42%, 82-89%, respectively. Diacetyl, acetoin, acetic acid, hexanoic acid, butyric acid and δ-decalactone were major volatiles in butter samples. In addition, cooked, creamy, rancid and margarine-like were the characteristic terms developed by the panelists.

Storage changes in low sodium-processed Mozzarella cheese prepared using potassium-based emulsifying salts

Dietary sodium has been considered to cause hypertension and other health ailments. Processed Mozzarella cheese (PMC) is a type of processed cheese that contains high sodium in the form of sodium chloride and sodium emulsifying salts. Henceforth, the aim of this study was to investigate the effect of partial substitution of sodium chloride (NaCl) with potassium chloride (KCl) and total replacement of sodium-based emulsifying salts with potassium-based emulsifying salts in the production of experimental PMC. A blend of potassium citrate and dipotassium phosphate (1:1) was used as an emulsifying salt. Changes in sensory attributes, physico-chemical characteristics, and functional properties of PMC were analyzed and compared with the corresponding changes in a control PMC made with NaCl and trisodium citrate. Products were evaluated after regular intervals of 7 days up to 56 days. Significant differences in flavor (28–56 days), sensory body and texture, acid degree value (0–42 days), soluble protein, titratable acidity (7–56 days), pH (7–56 days), meltability (0–56 days), and stretchability (4–49) were evident between the control and experimental PMC over storage. It appears that potassium replacement of sodium resulted in a low decrease in casein hydration and an increase in pH and bitterness. This subsequently resulted in a lower rate of proteolysis, lower flavor scores, lower meltability, lower titratable acidity, lower acid degree values, and greater stretchablity and sensory body and texture scores.