Tea
Permanent URI for this collectionhttps://kalroerepository.kalro.org/handle/123456789/13955
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Browsing Tea by Author "Kamunya, S."
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Item Untargeted Metabolomics Reveals Differences Between Commercial and Non-Commercial Camellia sinensis Cultivars Used in Black Tea Production(Springer, 2021-10-18) Nyarukowa, C.; van Reenen, M.; Koech, R.; Mason, S.; Lindeque, Z.; Kamunya, S.; Mose, R.; Apostolides, Z.; University of Pretoria ; North-West University (Potchefstroom Campus) ; Kenya Agriculture and Livestock Research Organization, Tea Research Institute ; James Finlay (Kenya) LimitedTea (Camellia sinensis) has enthralled both consumers and researchers, due to its taste, aroma and its medicinal attributes. Tea consumers concern themselves with the quality of tea in particular, its taste and aroma based on which consumers are willing to pay premium prices for the best quality teas. The quality of tea is undeniably affected by variations in its metabolite composition. In this study, two groups of black tea cultivars were compared using a metabolomics approach. Data were generated via GC–MS and 1H-NMR. The GC–MS differentiated between the two groups, based on carbohydrates. The 1H-NMR differentiated between the two groups, based on caffeine, catechins and amino acids. These metabolites applicability in the discrimination of newly developed cultivars into potentially commercialisable and non-commercialisable groups at an early stage in the tea improvement programme is demonstrated. This may help tea breeders to select promising high quality tea cultivars either for release or further field evaluations.Item UPLC-MS-Based Metabolomics Analysis Reveals Metabolite Compositional Differences Between Kenyan Commercial and Non-Commercial Black Tea (Camellia sinensis L.) Cultivars(Visagaa Publishing House, 2021) Nyarukowa, C.; Koech, R.; Kamunya, S.; Mose, R.; Apostolides, Z.; University of Pretoria ; Kenya Agriculture and Livestock Research Organisation - Tea Research Institute ; James Finlay (Kenya) LimitedCamellia sinensis (L.) O. Kuntze (tea) is one of the most widely consumed beverages worldwide, serving as an essential commodity crop for several developing countries. A bulk of tea’s health-promoting properties are attributed to the antioxidant properties of Epigallocatechin Gallate (EGCg), its predominant polyphenol. As a result of these health benefits, tea production and consumption have expanded and promoted tea industries’ development globally. Tea cultivation is dependent on a good distribution of rainfall, and the current changes in climate pose a significant threat to its global supply chains. Through the efforts of the International Centre for Tropical Agriculture (CIAT), predictions of future climate changes in the tea growing regions of Kenya between now and 2050 have been generated. A study was conducted to develop models to identify essential tea growing regions that will remain ideal for tea farming and investigate the metabolomic differences between 243 droughts susceptible NonCommercial (NComm) and 60 Commercial (Comm) cultivars. Non-targeted, high-resolution UPLC-MS was used to attain a new profound understanding of the metabolomic multiplicity between the Comm and NComm groups and elucidate their association with tea liquor quality and drought tolerance. Several metabolites, namely argininosuccinate, caffeic acid, caffeine, catechin, citric acid, epicatechin, epigallocatechin gallate, gallic acid, gluconic acid, glucose, maltose, quercetin and theanine, were found to differentiate between the Comm and NComm cultivars. These detected metabolites were linked to improved tea quality and drought tolerance in the Comm cultivars.
