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The relationship between some chemical parameters and sensory evaluations for plain black tea (Camellia sinensis) produced in Kenya and comparison with similar teas from Malawi and South Africa

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dc.contributor.author Owuor, Phillip O
dc.contributor.author Obanda, Martin
dc.contributor.author Nyirenda, Hastings E
dc.contributor.author Mphangwe, Nicholas IK
dc.contributor.author Wright, Louwrance P
dc.contributor.author Apostolides, Zeno
dc.date.accessioned 2018-05-31T08:17:36Z
dc.date.available 2018-05-31T08:17:36Z
dc.date.issued 2006-08-01
dc.identifier.uri https://repository.maseno.ac.ke/handle/123456789/521
dc.description.abstract Reliable and accurately measurable chemical parameters that can be used to estimate black tea quality are desirable in trade, research and breeding programmes. Using plain Kenyan black tea from 11 cultivars, which gave some significant differences in their plain black tea quality parameters, the individual theaflavins composition, total theaflavins, thearubigins, theaflavin digallate equivalent, total colour and brightness were determined. The parameters were regressed against sensory evaluation scores of two tasters A and B. The theaflavin digallate equivalent (TDE) showed the strongest relationship (r = 0.71 (P 6 0.01) and r = 0.80 (P 6 0.001)) for A and B0 , respectively. The simple (non gallated) theaflavin and thearubigins did not show significant relationships with sensory evaluation. Of the liquor characteristics, there were significant relationships between liquor brightness and sensory evaluation by A and B (r = 0.58 (P 6 0.06) and r = 0.59 (P 6 0.05)), respectively. In consequence, TDE and brightness can be used in tea breeding programmes as quality indicators or to estimate plain black tea quality potential in the tea trade. Optimising their levels can also help to produce good quality Kenyan black teas during processing. Comparison of these results with work published earlier indicates that, of the individual theaflavins, theaflavin3,30 -digallate correlates best with tea taster scores for the 11 Kenyan cultivars, whereas the simple theaflavin correlates best with tea tasters scores for 40 Malawian cultivars. However, the derived parameter, TDE correlates very well with tea tasters scores for all of the above cultivars en_US
dc.publisher Elsevier en_US
dc.subject Black tea; Camellia sinensis; Quality; Colour; Brightness; Theaflavins; Theaflavin digallate equivalents; Eastern Africa; Kenya; Central and Southern Africa; Malawi; South Africa en_US
dc.title The relationship between some chemical parameters and sensory evaluations for plain black tea (Camellia sinensis) produced in Kenya and comparison with similar teas from Malawi and South Africa en_US
dc.type Article en_US


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