Low-fat Yogurt Research Articles

Evaluation of physicochemical properties, antioxidant and sensory activity of three types of functional low-fat probiotic yogurt

Evaluation of physicochemical properties, antioxidant and sensory activity of three types of functional low-fat probiotic yogurt

Dietary Patterns Characterized by Fat Type in Association with Obesity and Type 2 Diabetes: A Longitudinal Study of UK Biobank Participants.

The fat type consumed is considered a risk factor for developing obesity and type 2 diabetes (T2D). However, these associations have not been investigated using a dietary patterns approach, which can capture combinations of foods and fat type consumed. This study aimed to investigate associations between dietary patterns with varying proportions of SFAs, MUFAs, or PUFAs and obesity, abdominal obesity, and self-reported T2D incidence. This study included UK Biobank participants with 2 or more 24-h dietary assessments, free from the outcome of interest at recruitment, and with outcome data at follow-up (n=16,523; mean follow-up: 6.3 y). Reduced rank regression was used to derive dietary patterns with SFAs, MUFAs, and PUFAs (% of energy intake) as response variables. Logistic regression, adjusted for sociodemographic and health characteristics, was used to investigate the associations between dietary patterns and obesity [BMI (kg/m2) ≥30], abdominal obesity (waist circumference; men: ≥102cm; women: ≥88cm) and T2D incidence. Two dietary patterns, DP1 and DP2, were identified: DP1 positively correlated with SFAs (r = 0.48), MUFAs (r = 0.67), and PUFAs (r = 0.56), characterized by higher intake of nuts, seeds, and butter and lower intake of fruit and low-fat yogurt; DP2 positively correlated with SFAs (r = 0.76) and negatively with PUFAs (r = -0.64) and MUFAs (r = -0.01), characterized by higher intake of butter and high-fat cheese and lower intake of nuts and seeds. Only DP2 was associated with higher obesity and abdominal obesity incidence (OR: 1.24; 95% CI: 1.02, 1.45; and OR: 1.19; 95% CI: 1.02, 1.38, respectively). Neither of the dietary patterns was associated with T2D incidence. These findings provide evidence that a dietary pattern characterized by higher SFA and lower PUFA foods is associated with obesity and abdominal obesity incidence, but not T2D.

The association between dairy products and psychological disorders in a large sample of Iranian adults

ABSTRACT Background Dairy products contain certain nutrients that are useful in mental disorders. This study aimed to assess the associations between dairy products and psychological disorders in a large sample of Iran, a Middle Eastern country. Methods This cross-sectional study was undertaken on 7387 adults. Data on dietary intakes were obtained using a validated Food Frequency Questionnaire. Psychological health was assessed by the Iranian validated version of depression, anxiety, and stress scale 21. Multivariable logistic regression analysis was performed to analyze the association between dairy intake and psychological disorders. Results After adjustment for potential confounders, total milk consumption (OR for the highest vs. lowest tertile: 0.73, 0.58-0.92) and total yogurt consumption (0.78, 0.62-0.97) were associated with decreased odds of depression. An inverse relationship was found between total dairy (0.73, 95% CI 0.590.91), total milk (0.72; 0.58-0.88), kashk (0.79, 0.65-0.96), and yogurt drink (0.80, 95% CI 0.65-0.98) consumption and anxiety symptoms. Higher intake of cheese was related to greater odds of stress (1.52, 1.02-2.26). No association was found between the consumption of high-fat dairy, low-fat dairy, low-fat milk, low-fat yogurt, high-fat yogurt, cheese, kashk, yogurt drink, and depression. Also, there is no association between dairy products and stress symptoms. This association was significant among men and women and high-fat and low-fat products in the total adjusted stratified analysis models. Conclusions Findings of this study revealed that both high-fat and low-fat dairy products are associated with a reduced prevalence of psychological disorders. Still, more prospective studies are required to confirm these associations.

Preparation of Low Fat Probiotic Yoghurt Supplemented with Pomegranate Pomace Powder as Source of Antioxidant Dietary Fibers

The effect of fortification of low fat milk with pomegranate pomace powder on the chemical, rheological, antioxidant and sensory properties of low fat (1% fat) probiotic yoghurt was studied. Pomegranate pomace powder was added to low fat milk yoghurt at levels of 1, and 2%., low fat yoghurt was analyzed when fresh and during the passage of 5, 10 and 15 days of storage at the temperature of the refrigerator. The results showed that fortification of reduced-fat milk used in the manufacture of probiotic yoghurt significantly affected the chemical composition of the resulting yoghurt as it increased the contents of total solids, protein, ash, dietary fiber and phenolic , ​​ pH and viscosity values, and these increases were proportional to the supplementation ratio. While the values ​​of acidity and whey separation decreased as a supplementation ratio increased. Supplementation of reduced fat yoghurt with the pomegranate pomace powder improved the via­bility of probiotic starter culture. Low fat yoghurt containing 2% pomegranate pomace powder had the highest scores of the sensory evaluation was gained in the presence of 2% pomegranate pomace powder, compared to other low fat yoghurt treatments .Through the results, it can be recommended to fortify the low-fat milk used in the manufacture of yoghurt with pomegranate pulp powder by 2%, as this fortification improved the chemical, rheological, antioxidant and sensory properties of the resulting low-fat yoghurt.

3D enabled facile fabrication of substrates with human tongue characteristics for analysing the tribological behaviour of food emulsions

The mouth-feel or oral perception of a food may vary in different oral surfaces or tongue-palate environment depending on the physical characteristics of human tongue. Tribological measurements emulating the characteristics of tongue-palate environment will assist in the evaluation of oral perception of food materials. This study reports a 3D printing assisted approach for rapid fabrication of the soft elastomer substrates with different surface (roughness) and bulk characteristics (elastic modulus and thickness) for tribological measurements. The influence of substrates with various regularly patterned surfaces, elastic modulus, and thickness on the lubrication properties of four food emulsions (full-fat and skim milk, high-fat and low-fat yoghurt) has been investigated. It is observed that friction coefficient of food emulsions increases with a decrease in height or an increase in density of rectangular micro-scale pillars representing papillae on the surface of soft substrate. Interestingly, a decrease in the elastic modulus of the substrates causes an increase in the friction coefficient for the milk samples, whereas for yoghurt samples it causes a decrease. The variations in the thickness of the substrates have little effect on the friction coefficients of the food emulsions.

Effect of buttermilk and skimmed milk powder on the properties of low-fat yoghurt

The aim of the study was to determine the potential of using buttermilk and skimmed milk powders as additives to standardize the dry matter content of milk in the production of low-fat yoghurt. A batch of yoghurt was produced using a starter culture of Lactobacillus delbruecki ssp. bulgaricus and Streptococcus thermophilus. The rates of milk acidification and pH levels were similar for both variants of yoghurt. After chilled storage (21 days), the yoghurt produced from milk supplemented with buttermilk powder was found to contain higher (P ≤ 0.05) levels of lactic acid (1.179%) than that supplemented with skimmed milk (1.154%). The use of buttermilk powder allowed reducing (not significantly, P > 0.05) syneresis in the stored yoghurt. The milk fat in the buttermilk–supplemented yoghurt showed lower (P ≤ 0.05) phospholipids content and exhibited slightly higher phospholipids loss during storage than the yoghurt produced from milk with addition of milk powder. No differences were found between the profile of fatty acids between the yoghurts enriched with skimmed milk powder and those enriched with buttermilk powder. Buttermilk can be used as an additive to produce a novel yoghurt type with modified functional features.Research HighlightsThe use of buttermilk powder did not affect fermentation process, however increased lactic acid content and water-holding capacity of yoghurt.The yoghurts with added buttermilk contained less phospholipids when compared with yoghurts supplemented with milk powder.Buttermilk powder can be incorporated as an ingredient in production of novel yoghurt type with improved functional features.

Production of functional low-fat yogurt fortified with flaxseed flour

Production of functional low-fat yogurt fortified with flaxseed flour

Non-Fat Yogurt Fortified with Whey Protein Isolate: Physicochemical, Rheological, and Microstructural Properties.

The demand for low- and non-fat products has recently increased due to the health problems, such as obesity, diabetes, and cardiovascular diseases, that have resulted from high-fat products. However, the reduction in fat can affect the quality of products adversely. The objective of this work was to explore the potential of whey protein isolate (WPI) in improving the quality of non-fat yogurt prepared using skim milk powder (SMP). Yogurt mixes (standardized at 14% total solids) were formulated using SMP as a milk base enriched with WPI. The SMP was replaced by WPI in the yogurt mixes at a rate of 3, 5, 7, and 9%. Full-fat and non-fat set-style yogurts were prepared from whole milk and skim milk, respectively, as controls. Yogurts were fermented at 43 °C to get a pH of 4.6 and stored at 4 °C for the next day. The texture, microstructure, rheological characteristics, and sensory properties of the yogurt samples were studied. The incorporation of WPI increased the water holding capacity to 50% as compared to the non-fat control. This improved the rheological properties while the yogurt viscosity increased in direct proportion with increasing the WPI. The firmness of yogurt was inversely proportional to the increase in WPI, which resulted in 180 g firmness when 9% WPI was added to the non-fat yogurt formulations. Yogurts’ microstructure improved by the addition of WPI. The non-fat yogurt incorporated with 3 and 7% WPI had comparable sensory and textural characteristics to the full-fat yogurt. WPI can be used as a fat replacer to develop low-fat yogurt with desired features. WPI may be a natural and economical ingredient for producing low- and non-fat fermented dairy food products.

Theoretical substitutions between dairy products and all-cause and cause-specific mortality. Results from the Danish diet, cancer and health cohort.

A daily intake of dairy products is recommended in many countries in order to maintain optimal health throughout life. However, evidence regarding the association between intake of individual dairy products and mortality is limited. We therfore,explored associations between intake of different dairy products and all-cause and cause-specific mortality using specified theoretical substitution analyses. We analysed data from 55775 Danish men and women aged 50-64 years between 1993 and 1997. Information about dairy product intake at baseline was collected using a validated food frequency questionnaire. Information about vital status and causes of death was obtained through national registers. Measures of associations were calculated using Cox proportional hazards regression. During a median follow-up of 19·0 years, 11586 participants died. For all-cause mortality, we observed that the intake of low-fat milk, whole-fat milk or low-fat yogurt products in place of cheese was associated with a higher rate of death (hazard ratios between 1·03 and 1·12 per serving/d substituted). The same pattern was present for CVD mortality. For cancer mortality, whole-fat milk and low-fat yogurt products in place of cheese were also associated with a higher rate of death for men while for women, whole-fat milk in place of buttermilk was associated with a higher cancer mortality rate. The results appeared robust in several sensitivity analyses. Our results suggest that intake of low-fat milk, whole-fat milk or low-fat yogurt products in place of cheese is associated with a higher rate of all-cause and cause-specific mortality.

Physicochemical and functional properties of yoghurt powder

The aim of this work was to investigate the physical, chemical and functional properties of yoghurt powder prepared by air drying of low fat yoghurt so that it can be used as a conclusive dairy ingredient for value addition and nutrition. For that fresh yogurt was air dried in electric tray dehydrator in 3-5mm at 55-60 °C temperature at air velocity 1.5m/s. Evaluation of moisture value, fat value and ash value was done to study the proximity of yoghurt powder. Tests such as pH, titratable acidity, vitamin C and DPPH were applied to study the chemical properties of yoghurt powder. Study of the bulk properties was done so as to reduce the storage and transportation volume of product. Carr's compressibility index and Hausner ratio were applied to study the flow ability. Wettability, dispersibility, water absorption capacity, solubility, free fat, and sedimentation were conducted for finding the functional properties of yoghurt powder.

Utilization of thermal-denatured whey protein isolate-milk fat emulsion gel microparticles as stabilizers and fat replacers in low-fat yogurt

In the current study, thermal-denatured whey protein-milk fat emulsion gel microparticles (WPI-EGs) were used as stabilizers and fat replacers in low-fat yogurt. The effects of emulsion gel microparticles were studied on the texture, rheology, microstructure, and sensory evaluation of low-fat yogurt. The results showed that yogurt with WPI-EGs had a better (p < 0.05) water-holding capacity. The hardness of low-fat yogurt (1.50% (wt/wt) fat) added with WPI-EGs (1.5% LF-EY) increased (p < 0.05) significantly compared than skim yogurt and whole fat yogurt. Results from scanning electron microscopy showed that with the addition of WPI-EGs, yogurt has a more compact network structure and smaller pores. This study shows that WPI-EGs can be used as an effective fat replacer and stabilizer in yogurt. WPI-EGs have broad application prospects in dairy products, such as low-fat ice cream and processed cheese.

Effects of Balangu Seed Gum on Physicochemical and Sensory Characteristics of Low-Fat Fresh Yoghurts

Effects of Balangu Seed Gum on Physicochemical and Sensory Characteristics of Low-Fat Fresh Yoghurts

Investigation of physico-chemical and microbial properties of low fat yogurt enriched with whey protein concentration, milk protein concentration, and wheat-psyllium fiber

Investigation of physico-chemical and microbial properties of low fat yogurt enriched with whey protein concentration, milk protein concentration, and wheat-psyllium fiber

Therapeutic potential of low-fat yogurt supplemented with Dried Nabaq fruit (Zizyphus spina-christi L) on hyperglycemia in streptozotocin-induced diabetic rats.

Therapeutic potential of low-fat yogurt supplemented with Dried Nabaq fruit (Zizyphus spina-christi L) on hyperglycemia in streptozotocin-induced diabetic rats

Rheological properties of xanthan-modified fish gelatin and its potential to replace mammalian gelatin in low-fat stirred yogurt

Fish gelatin (FG) has been modified to replace mammalian gelatin, but has not been applied in the yogurt production. In this study, xanthan gum (XG) was used to improve the rheology properties of FG, and the XG-modified FG was applied in acid milk gels and low-fat yogurts to mimic the rheology and texture properties of porcine gelatin (PG). No obvious difference in the storage moduli was observed for the FG gels (2.5 g/100 g) with the addition of XG from 0 to 0.05 g/100 g, while increasing addition of XG increasingly impeded the gelation process of FG. Moreover, in the milk gel system with FG addition (0.4 g/100 g), an increase in the XG proportion caused an increase in the storage moduli. Milk gels with a XG to FG ratio of 1:99 best mimicked the storage moduli of milk gels with PG. In the yogurt system, yogurt with 0.4 g/100 g XG-modified FG had better water-holding capacity and consistency than the yogurt with 0.4 g/100 g PG, and had similar viscosity, pseudoplasticity, and thixotropy to yogurt with 0.4 g/100 g PG. The results suggested that XG-modified FG is a promising replacement for mammalian gelatin in low-fat stirred yogurt.

Impact of yeast sediment beta-glucans on the quality indices of yoghurt

The objective of the study was to investigate the potential application of beta-glucans obtained from yeast sediment resulting from the manufacture of local Viorica wine (2018 harvest). To determine the amount of beta-glucans in the yeast sediment, two were used: the calculation method and the laboratory method, obtaining similar quantities, 29.92 ± 0.47 and 28.17 ± 0.32 respectively. The beta -glucans obtained were incorporated in various concentrations (0.1%; 0.2%; 0.3%; 0.4% and 0.5%) in the yogurt obtained from skimmed milk. The effect of beta-glucan addition on the physicochemical properties of freshly prepared yogurts was investigated. The addition of beta-glucans positively influenced the formation of the gel relay resulting in a decrease in the fermentation time of yogurt. The final pH point of 4.5 was reached one hour earlier (in 4 hours) compared to the control sample (in 5 hours). The results showed that there are no significant changes in physicochemical properties (titratable acidity, pH, viscosity and syneresis). The results obtained report that beta-glucans can be used as a thickening agent for low-fat yogurts by shortening the fermentation period and not essentially changing the sensory characteristics. Experimental results showed that the glycemic index of yogurt samples with the addition of beta-glucans have similar values in the range of 28-30. Respectively, the yogurts under study are attributed to food category with low glycemic index.

THE EFFECT OF MICROWAVE OUTPUT POWER ON DRYING KINETICS OF YOGHURT AND MATHEMATICAL MODELING OF DRYING CURVES

The objectives of this study were investigation the effects of microwave output powers on drying kinetics of yoghurt, selecting the best fitted thin-layer model to characterize the drying behavior of yoghurt and determination of the activation energy and effective diffusivity. In order to achieve these objectives, low-fat yoghurt was dried by using domestic microwave oven at different microwave output powers (100, 180 and 300 W). Average drying rates were determined as 1.49, 4.43 and 7.90 g H2O m-2 s-1 for microwave output powers of 100, 180 and 300 W, respectively. The effective moisture diffusivities were determined as 3.30 x 10-9, 6.62 x 10-9 and 1.15 x 10-8 m2 s-1 for 100, 180 and 300 W, respectively. The Ea of yoghurt was found as 3.62 W g-1. Midilli and others model was selected as best fitted model due to highest values of R2 and low values of χ2, RMSE and RSS.

Advancements in functionality and quality characteristic of yoghurt- a fermented dairy product: a review

Yoghurt a fermented product is a wholesome, nutritious food product, liked by every segment of the population. There has been a continuous effort in increasing the quality of the product by fortification and technological interventions. Researchers have focused on the addition of vitamins and minerals to eradicate micronutrient deficiency as well as the addition of health-promoting bioactive functional ingredients such as Hibiscus sabdariffa (calyx) extract and natural antimicrobial agents such as essential oils to increase the shelf life and quality parameters of yoghurt. In the case of low-fat yoghurt, carbohydrate-based fat replacers like barley beta-glucan, guar gum and inulin were used and compared with milk fat. Present review focuses on the influence of antioxidant-rich fruits such as Rutub date, mulberry pekmez and concentrated grape juice on the fermentation and quality of fruit flavoured yoghurt. There has been an innovation in product design such as carbonated yoghurt prepared from sweetened low-fat yoghurt and yog-ice cream by addition of inulin. The present review signifies that enrichment of yoghurt with functional ingredients leads to enhancement in the quality, storage stability as well as health benefits making it a product suitable for maintaining good health and curing diseases of the population in a whole.

Effect of low-fat dairy products fortified with 1500IU nano encapsulated vitamin D3 on cardiometabolic indicators in adults with abdominal obesity: a total blinded randomized controlled trial

Background & aims Vitamin D deficiency is widespread worldwide. In this study, we aimed to evaluate the effect of a nano encapsulated form of vitamin D used for fortifying low-fat dairy products (milk and yogurt) on anthropometric indices, glycemic status, and lipid profile in subjects with abdominal obesity. Methods In a totally (quadruple) blinded, randomized, and parallel-controlled trial, 306 individuals with abdominal obesity were randomly allocated to one of four groups: fortified low-fat yogurt (FY, 1500 IU nano encapsulated vitamin D3 per 150 g/d), non-fortified low-fat yogurt (nFY), fortified low-fat milk (FM, 1500 IU nano encapsulated vitamin D3 per 200 g/d), non-fortified low-fat milk (nFM), for 10 weeks (nFM and nFY, were considered as the control groups). Anthropometric and biochemical parameters were measured at baseline and after a ten-week trial in Mashhad, Iran. Results After the ten-week intervention, we found a significant increase in serum concentration of 25(OH)D in both the FM and FY groups compared to the respective control groups (19.10 ± 5.69 ng/mL and 20.88 ± 5.76 ng/mL respectively, p < .001). We observed a significant reduction in weight to hip ratio (p = .04) and a significant improvement in triglyceride (p < .001) and HDL-C (p = .01) only in FM group compared to nFM group. Also, we found a significant reduction in fasting serum insulin (p < .001), and a significant improvement of HOMA-IR (p < .001) and QUICKI (p < .001) in both intervention groups compared to their placebos. Conclusions An intake of fortified dairy products containing nano-encapsulated vitamin D3 was associated with an improvement in some measures of anthropometric indices, glucose homeostasis, and lipid profiles, particularly in individuals receiving fortified milk. Hence, along with other benefits, fortification of dairy products with vitamin D may be an effective approach to improve some cardiometabolic indicators, such as insulin resistance. Trial registration number IRCT20101130005280N27

Evaluation of lactose oxidase as enzymatic antifungal control for Penicillium spoilage in yogurt

In this study, we investigated the antifungal activity of lactose oxidase (LO) as a potential biopreservative in dairy products. Our study objectives were to screen antifungal activity of LO against common mold strains, to detect the minimum inhibitory level of LO against the same strains, and to understand how LO affects the pH and lactic acid bacteria (LAB) counts in set yogurt. Five mold strains (Penicillium chrysogenum, Penicillium citrinum,Penicillium commune,Penicillium decumbens,and Penicillium roqueforti) were used throughout study. These strains were previously isolated from dairy manufacturing plants. Throughout the study, yogurts were stored at 21 ± 2°C for 14 d. Antifungal activity of LO was screened using 2 enzyme levels (1.2 and 12 g/L LO) against selected strains on the surface of a miniature laboratory set-yogurt model. For all tested strains, no visible mold growth was detected on the surface of yogurts covered with LO compared with control yogurt without LO. The minimum inhibitory level of LO against each strain was further investigated using 4 enzyme levels (0.12, 0.48, 0.84, and 1.2 g/L LO) on the miniature laboratory set-yogurt model. We detected 0.84 g/L LO as the minimum level inhibiting visible hyphal growth across strains. The minimum inhibitory level of LO varied for each individual strain. To study the effect of LO on the pH of yogurt, miniature laboratory set-yogurt models were covered with different enzyme levels (0.12, 0.48, 0.84, 1.2, and 12 g/L LO). At d 14, a difference was detected comparing pH values of treatments to control with no LO. Commercial low-fat set yogurt was used to study the effect of LO on LAB survival when yogurt surface was covered with 0.84 g/L LO under the same experimental conditions. Control with no LO was included. At d 14, 3 levels of catalase were added (0, 0.01, and 0.1%) to each treatment. To enumerate LAB, homogenized samples were plated on de Man, Rogosa, and Sharpe agar and incubated. Yogurts with 0.84 g/L LO had lower LAB counts compared with control yogurts, and catalase level did not have a significant effect on LAB counts. Our results demonstrated potential antifungal efficacy of LO against common spoilage organisms in dairy products with residual lactose and relatively low pH. Manufacturers should establish efficacy of LO against mold strains of interest and determine the effects of LO on organoleptic properties and LAB survival in set yogurt.