期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 97, 期 15, 页码 5100-5106出版社
WILEY
DOI: 10.1002/jsfa.8387
关键词
fermented tea; high-theabrownins; submerged fermentation; optimization; Box-Bencken design
资金
- Anhui Province Natural Science Foundation [1508085SMC217]
- Zhangzhou City Key Science and Technology Planning Project [ZZ2016ZD17]
- Anhui Province District Key Project [15czz03101]
BACKGROUNDTheabrownins (TB) are bioactive components that are usually extracted from Chinese dark tea, in which they are present at low concentrations. The present study aimed to produce an instant dark tea high in theabrownins via submerged fermentation by the fungus Aspergillus niger. Three fermentation parameters that affect theabrownins content (i.e. inoculum size, liquid-solid ratio and rotation speed) were optimized using response surface methodology. RESULTOptimum fermentation conditions were modeled to be an inoculum of 5.40% (v/v), a liquid-solid ratio of 27.45mLg(-1) and a rotation speed of 184rpm and were predicted to yield 292.99gkg(-1) TB. Under these experimentally conditions, the TB content of the instant dark tea was 291.93gkg(-1). The antioxidant capacity and -glucosidase and pancreatic lipase inhibitory activities of the high-TB instant black tea were higher than four other typical instant dark tea products. CONCLUSIONThe results of the present study show that careful management of culture conditions can produce a dark tea high in theabrownins. Furthermore, high-theabrownins instant dark tea could serve as a source of bioactive products and be used in functional foods as an ingredient imparting antioxidant properties and the ability to inhibit pancreatic lipase and -glucosidase. (c) 2017 Society of Chemical Industry
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