Incorporation of uvaia ( Eugenia pyriformis Cambess) pulp in yogurt: A promising application in the lactose‐free dairy product market

Functional stirred yogurt manufactured using co-microencapsulated or free forms of grape pomace and flaxseed oil as bioactive ingredients: Physicochemical, antioxidant, rheological, microstructural, and sensory properties

Functional stirred yogurt samples were manufactured with combinations of grape pomace (GP) and flaxseed oil (FO) in microencapsulated or free forms (2% w/w) and quality characteristics of yogurts were investigated during 21 days of storage. The incorporation of GP and FO in microencapsulated or free forms caused a significant decrease in pH, syneresis, and a significant increase in acidity, water holding capacity, and viscosity of stirred yogurt (p < .05). While stirred yogurt containing GP and FO in free form had the highest loss modulus (G″), all yogurt samples represented solid-like behavior. Stirred yogurts containing the microencapsulated form of GP and FO showed the highest amount of phenolics and antioxidant activity compared with the two other yogurt samples (p < .05). More compact structure and higher gel strength were observed in stirred yogurts formulated with the microencapsulated or free form of GP and FO, compared to the control yogurt sample. The overall sensory acceptability of stirred yogurt manufactured using the encapsulated form of GP and FO was not significantly different from the control yogurt sample (p > .05). In conclusion of this competitive study, GP and FO as bioactive compounds could be used in the microencapsulated form in order to develop functional stirred yogurt with specific quality characteristics.

Characterization of the effects of binary probiotics and wolfberry dietary fiber on the quality of yogurt

The effects of binary probiotics (Lacticaseibacillus casei CGMCC1.5956 and Lactiplantibacillus plantarum subsp. plantarum CGMCC 1.5953) in conjunction with wolfberry dietary fiber (WDF) on yogurt quality were investigated in this study. d-fructose, β-d-glucose, 6-acetyl-d-glucose, and 1-ketose in WDF significantly improved syneresis, apparent viscosity, and elastic behavior of yogurt. Binary probiotics were more suitable for fermenting WDF yogurt than single probiotics, resulting in a higher viable count (9.39 lg (CFU/mL)) and unique flavor. Binary probiotics can promote the production of tyrosol by L. casei 56 through the tyrosine metabolic pathway, thereby enhancing the resistance of L. casei 56 and L. plantarum 53 to their environment and promoting growth. Pyridine, 2,3,4,5-tetrahydro- and prenol might be responsible for the high odor scores in the sensory evaluation of WDF yogurt prepared using binary probiotics. In summary, combining binary probiotics and WDF can significantly improve yogurt quality and add value to the final product.

Effect of Tamarillo Fortification and Fermentation Process on Physicochemical Properties and Nutrient and Volatiles Content of Yoghurt

Bright-red Laird’s Large tamarillo is a unique and under-utilised fruit that is a dietary source of carotenoids, vitamins C and E, and dietary fibre. The effects of the addition of freeze-dried tamarillo powder (5–15%) to milk and yoghurt starter either before (PRE) or after (POS) fermentation on physicochemical properties were examined. Using LC-MS and GG-MS, nutrient and volatile contents of tamarillo yoghurt were also examined. The addition of tamarillo prior to fermentation was associated with a more yellow colour and higher concentrations of tocopherol compared to when tamarillo was added after fermentation. Higher elastic modulus, PUFAs, pro-vitamin A content, and vitamin C retention were observed for POS than PRE. All tamarillo yoghurts showed improvement in syneresis, lower lactose content, and higher concentrations of antioxidant vitamins than the commercial premium-assorted fruits yoghurt from New Zealand Food Composition Data. Yoghurt fortified with tamarillo powder offers the potential for the development of a high-value nutritional product that could be a good source of vitamin C and a source of vitamin E and β-carotene, and maintain the volatiles that give tamarillo its distinctive flavour.