cqvip:The mixed fermentation is based on the raw material of raspberry and mulberry. The research is to explore the sticking point for the fermentation progress. To attain the optimized fermentation condition which gained by integrating fermentation data,the concentration of pectinase should be 80 mg/L,the mass fraction of Lactobacillus,Acetobacter and yeast should be 3%,1% and 3%,respectively,the fermentation temperature should be 28 ℃,the initial sugar content should be 24°,and the duration of fermentation should be 16 d. After the fermentation,sugar content should be adjusted to 25°,and the products should be stored for 3 d in the condition of 15 ℃. The Raspberry-mulberry leaven containing 8. 5 × 10~8 probiotics per milliliter and 61. 2 g total acid per liter should be diluted with various proportions of water to drink according to different habits of customers[1]. The volume ratio of leaven and water should be at least 1∶ 1 and at most 1∶ 3.
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