Tags

Type your tag names separated by a space and hit enter

Preparation of partially decaffeinated instant green tea.
J Agric Food Chem. 2007 May 02; 55(9):3498-502.JA

Abstract

The caffeine level of instant tea extracted from decaffeinated leaf tea with 4.0 mg g-1 caffeine is commonly above 10.0 mg g-1, the maximum limit of caffeine for decaffeinated instant tea. Further removal of caffeine by active carbon (AC) from the green tea extract was investigated. It showed that the removal of caffeine from the tea extract solutions depended on the treatment time and tea extract concentration while the ethanol concentration and pH had little effect on the removal of caffeine. According to the removal of caffeine and the ratio of total catechins to caffeine in the tested samples, the optimum decaffeination conditions were determined to be as follows: tea extract concentration 15-30 g L-1 for common tea extract but higher for partially decaffeinated tea leaf extract; ratio of tea solution to AC, 100 mL:4 g; treatment time, 4 h; and natural tea extract pH. Instant tea powder extracted from partially decaffeinated leaf tea with a caffeine level of 4.03 mg g-1 and further decaffeinated by AC had a caffeine level of 7.81 mg g-1, which was 31% lower than that without AC treatment.

Authors+Show Affiliations

Zhejiang University Tea Research Institute, 268 Kaixuan Road, Hangzhou 310029, People's Republic of China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17407319

Citation

Ye, Jian-Hui, et al. "Preparation of Partially Decaffeinated Instant Green Tea." Journal of Agricultural and Food Chemistry, vol. 55, no. 9, 2007, pp. 3498-502.
Ye JH, Liang YR, Jin J, et al. Preparation of partially decaffeinated instant green tea. J Agric Food Chem. 2007;55(9):3498-502.
Ye, J. H., Liang, Y. R., Jin, J., Liang, H. L., Du, Y. Y., Lu, J. L., Ye, Q., & Lin, C. (2007). Preparation of partially decaffeinated instant green tea. Journal of Agricultural and Food Chemistry, 55(9), 3498-502.
Ye JH, et al. Preparation of Partially Decaffeinated Instant Green Tea. J Agric Food Chem. 2007 May 2;55(9):3498-502. PubMed PMID: 17407319.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Preparation of partially decaffeinated instant green tea. AU - Ye,Jian-Hui, AU - Liang,Yue-Rong, AU - Jin,Jing, AU - Liang,Hue-Ling, AU - Du,Ying-Ying, AU - Lu,Jian-Liang, AU - Ye,Qian, AU - Lin,Chen, Y1 - 2007/04/04/ PY - 2007/4/5/pubmed PY - 2007/7/25/medline PY - 2007/4/5/entrez SP - 3498 EP - 502 JF - Journal of agricultural and food chemistry JO - J. Agric. Food Chem. VL - 55 IS - 9 N2 - The caffeine level of instant tea extracted from decaffeinated leaf tea with 4.0 mg g-1 caffeine is commonly above 10.0 mg g-1, the maximum limit of caffeine for decaffeinated instant tea. Further removal of caffeine by active carbon (AC) from the green tea extract was investigated. It showed that the removal of caffeine from the tea extract solutions depended on the treatment time and tea extract concentration while the ethanol concentration and pH had little effect on the removal of caffeine. According to the removal of caffeine and the ratio of total catechins to caffeine in the tested samples, the optimum decaffeination conditions were determined to be as follows: tea extract concentration 15-30 g L-1 for common tea extract but higher for partially decaffeinated tea leaf extract; ratio of tea solution to AC, 100 mL:4 g; treatment time, 4 h; and natural tea extract pH. Instant tea powder extracted from partially decaffeinated leaf tea with a caffeine level of 4.03 mg g-1 and further decaffeinated by AC had a caffeine level of 7.81 mg g-1, which was 31% lower than that without AC treatment. SN - 0021-8561 UR - https://www.unboundmedicine.com/medline/citation/17407319/Preparation_of_partially_decaffeinated_instant_green_tea_ L2 - https://dx.doi.org/10.1021/jf070046c DB - PRIME DP - Unbound Medicine ER -