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Effects of Cellulase from Aspergillus niger and Solvent Pretreatments on the Extractability of Organic Green Tea Waste

Authors
Kim, Jae HunPan, Jeong HoonHeo, WanLee, HyungjaeKwon, Eung GiLee, Hong-GuShin, Dong HoonLiu, Rui HaiKim, Young Jun
Issue Date
13-Oct-2010
Publisher
AMER CHEMICAL SOC
Keywords
Catechin; cellulase; extraction; green tea; solvent pretreatment
Citation
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, v.58, no.19, pp.10747 - 10751
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume
58
Number
19
Start Page
10747
End Page
10751
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/115516
DOI
10.1021/jf102346p
ISSN
0021-8561
Abstract
As green tea is being consumed in larger amounts, more green tea waste is being produced. Following extraction, several bioactive compounds may exist in the waste including polyphenols and amino acids. It was found that an Aspergillus niger cellulase treatment of green tea waste increased the extractability of various nutritional and functional components after pretreatments with various extraction solvents such as cold water (CW), hot water (HW), sulfuric acid (SA), hydrochloric acid (HA), and methanol (Me). After the residue was treated with cellulase from Aspergillus niger, the amounts of polyphenols, total catechins, and reducing sugars in the HW extract were increased by 64.6, 941.2, and 350.9%, respectively. In particular, levels of epigallocatechin, epicatechin, and gallic acid were significantly enhanced compared to those in the nontreated control. However, protein extraction was not significantly affected, and cellulase treatment was not more efficient for caffeine extraction compared to phenolic extraction. Among the four extraction solvents, HW and SA showed relatively higher extractabilities as compared to the other groups (CW, HA, and Me). These results indicate that cellulase from A. niger can increase the extractability of green tea waste when combined with certain solvent pretreatments. Consequently, the residual functional compounds and essential nutrients from cellulase-treated green tea waste have the potential to be applied in the production of new functional foods.
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