Processing Technology of Beijing Traditional Food“Douzhi”

doi:10.7506/spkx1002-6300-201002070

FOOD SCIENCE ›› 2010, Vol. 31 ›› Issue (2): 280-283.doi: 10.7506/spkx1002-6300-201002070

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Processing Technology of Beijing Traditional Food“Douzhi”

DING Yu-zhen1，ZHANG Shao-ying1,2,*，LIANG Jin-yi3，LIU Peng2

(1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China；2. College of
Engineering, China Agricultural University, Beijing 100083, China；3. Beijing Naton Medical Group, Beijing 100082, China

Received:2009-03-31 Revised:2009-08-24 Online:2010-01-15 Published:2010-12-29
Contact: ZHANG Shao-ying1,2,*， E-mail:cauzsy@139.com

Abstract

Abstract:

To enhance the product quality of Beijing traditional food “Douzhi”, the microbiological, chemical and biochemical changes during its processing were studied. Lactic acid producing bacteria were confirmed accounting for the natural acidification of mung bean milk during sedimentation. The main fermenting bacteria came from two species: Lactococcus lactis and Leuconostoc citreum, which accounted for 72% and 26% of the total, respectively. Soaking brought little change in starch content, but caused a significant reduction in crude protein and sugars and an increased level in soluble proteins and free amino acids content. This suggests that a high metabolic activity is induced during steeping. Fermentation caused a rapid reduction in soluble proteins, soluble sugars and reducing sugars and a significant accumulation in free amino acids. Mung bean endogenous protease and amylase activity dropped significantly during fermentation, while the activity of microbial protease enhanced during the latter part.

Key words: mung bean, Lactococcus lactis, Leuconostoc citreum

CLC Number:

TS214.9

DING Yu-zhen1，ZHANG Shao-ying1,2,*，LIANG Jin-yi3，LIU Peng2. Processing Technology of Beijing Traditional Food“Douzhi”[J]. FOOD SCIENCE, 2010, 31(2): 280-283 https://doi.org/10.7506/spkx1002-6300-201002070

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Processing Technology of Beijing Traditional Food“Douzhi”

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