Acta Agriculturae Zhejiangensis ›› 2026, Vol. 38 ›› Issue (6): 1099-1111.DOI: 10.3969/j.issn.1004-1524.20250709

• Future Foods and Health • Previous Articles     Next Articles

Study on the preparation of dual-protein yogurt by co-fermentation with Weissella confusa and its storage stability

KANG Ying(), YE Tao, BAI Xueying, ZHANG Xuejiao*()   

  1. Hunan Provincial Key Laboratory of Soybean Products Processing and Safety Control, College of Food Science and Chemical Engineering, Shaoyang University, Shaoyang 422000, Hunan, China
  • Received:2025-11-23 Online:2026-06-25 Published:2026-07-14

Abstract:

To prepare a plant-animal dual-protein yogurt with stable texture, appropriate taste, and rich nutrition, this study for the first time utilized Weissella confusa SY628 strain (a high-yield dextran-producing strain) in combination with a commercial yogurt starter (YF-L904 compound bacterial powder) for the co-fermentation of a soymilk-milk mixed system to develop a novel dual-protein yogurt. Following single-factor experiments, response surface methodology was employed to optimize the fermentation conditions. The quality stability during 28 days of storage was evaluated by determining key nutritional components, physicochemical properties, texture profiles, rheological properties, and microstructure. The results showed that the optimal fermentation conditions were as follows: milk-to-soymilk ratio of 6∶4, fermentation temperature of 30 ℃, ratio of bacterial liquids (bacterial liquid of SY628 strain to bacterial liquid of YF-L904) of 1∶3, sucrose addition amount of 6%, and inoculum size of 3%. Under these conditions, a sensory score of 88.67 was achieved. The polysaccharide content of the dual-protein yogurt produced under the optimal fermentation conditions (SYF) was 22.6 g·kg-1, which was significantly (p<0.05) higher than that of the yogurt fermented solely with the commercial yogurt starter (CN). Throughout the 28-day storage period, SYF exhibited higher hardness, cohesiveness, and springiness in texture; better water-holding capacity; higher storage modulus, loss modulus, and complex viscosity; and a denser sheet-like gel structure. Consequently, SYF demonstrated enhanced storage stability compared with CN. This study provides a feasible technical solution for developing additive-free functional dual-protein yogurt and expands the application prospects of Weissella confusa in functional fermented foods.

Key words: Weissella confusa, dual protein yogurt, fermentation process optimization, stability

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