Journal
FOOD CHEMISTRY
Volume 141, Issue 4, Pages 3744-3751Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.06.086
Keywords
CTC black tea; Chemical composition; Antioxidant activity; Northeast India
Funding
- Tea Board, India
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Sixty black tea samples from different agro climatic zones of northeast India were assessed for biochemical constituents that determine quality and also influence organoleptic perception. The antioxidant activities such as alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH) free radical scavenging, lipid peroxidation inhibition, nitrite scavenging and super oxide scavenging, of the collected samples were analysed. Out of the four antioxidant activities, the super oxide scavenging activity was lowest and nitrite scavenging activity was highest. Theaflavin was significantly and positively correlated with nitrite scavenging and lipid peroxidation inhibition activities. Thearubigins showed a significant positive correlation only with nitrite scavenging activity. Correlations between relative antioxidant capacity index (RACI) and TF, TR and tasters' quality were positive and significant. Tea tasters' parameters were significantly and positively correlated with each other. Principal component analysis showed that Upper Assam, North Bank and South Bank produced better quality tea than other regions with respect to TF, TR, RACI and tasters' quality. (C) 2013 Elsevier Ltd. All rights reserved.
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