Variation in Levels of Flavonols Myricetin, Quercetin and Kaempferol—In Kenyan Tea (<i>Camellia sinensis L.</i>) with Processed Tea Types and Geographic Location  

作　　者：Simon Mwangi Kingori Simon Oduor Ochanda Robert Kipyegon Koech Simon Mwangi Kingori;Simon Oduor Ochanda;Robert Kipyegon Koech(Kenya Agricultural and Livestock Research Organization, Tea Research Institute (KALRO), Kericho, Kenya)

机构地区：[1]Kenya Agricultural and Livestock Research Organization, Tea Research Institute (KALRO), Kericho, Kenya

出　　处：《Open Journal of Applied Sciences》2021年第6期736-749,共14页应用科学（英文）

摘　　要：The aim of this study was to determine the levels of myricetin, quercetin, and kaempferol in green and black Kenyan types in relation to geographic location of production. Tea samples were extracted before chromatographic separations with a Shimadzu 20A HPLC coupled with PDA. Flavonol levels were quercetin ><span lang="EN-US" style="font-family:;" "=""> </span><span lang="EN-US" style="font-family:;" "="">kaempferol > myricetin. Teas from east of rift, had quercetin 1.25</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.83 mg/g and 1.29</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.71 mg/g for green and black types, respectively. Kaempferol levels were between 1.28</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.72 mg/g in green and 1.36</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.76 mg/g in black tea. Myricetin ranged at 0.40</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">0.79 mg/g green and 0.12</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">0.38 mg/g black tea types. Total flavonols in green tea w</span><span lang="EN-US" style="font-family:;" "="">ere</span><span lang="EN-US" style="font-family:;" "=""> highest at 4.28 mg/g while black tea was</span><span lang="EN-US" style="font-family:;" "=""> </span><span lang="EN-US" style="font-family:;" "="">3.83 mg/g. These trends agree well with those observed in teas west of the rift. For tea types, myricetin and kaempferol showed </span><span lang="EN-US" style="font-family:;" "="">a </span><span lang="EN-US" style="font-family:;" "="">significa<span style="letter-spacing:-0.15pt;">nt difference (P</span></span><span lang="EN-US" style="font-family:" letter-spacing:-0.15pt;"=""> </span><span lang="EN-US" style=The aim of this study was to determine the levels of myricetin, quercetin, and kaempferol in green and black Kenyan types in relation to geographic location of production. Tea samples were extracted before chromatographic separations with a Shimadzu 20A HPLC coupled with PDA. Flavonol levels were quercetin ><span lang="EN-US" style="font-family:;" "=""> </span><span lang="EN-US" style="font-family:;" "="">kaempferol > myricetin. Teas from east of rift, had quercetin 1.25</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.83 mg/g and 1.29</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.71 mg/g for green and black types, respectively. Kaempferol levels were between 1.28</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.72 mg/g in green and 1.36</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">1.76 mg/g in black tea. Myricetin ranged at 0.40</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">0.79 mg/g green and 0.12</span><span lang="EN-US" style="font-family:;" "="">-</span><span lang="EN-US" style="font-family:;" "="">0.38 mg/g black tea types. Total flavonols in green tea w</span><span lang="EN-US" style="font-family:;" "="">ere</span><span lang="EN-US" style="font-family:;" "=""> highest at 4.28 mg/g while black tea was</span><span lang="EN-US" style="font-family:;" "=""> </span><span lang="EN-US" style="font-family:;" "="">3.83 mg/g. These trends agree well with those observed in teas west of the rift. For tea types, myricetin and kaempferol showed </span><span lang="EN-US" style="font-family:;" "="">a </span><span lang="EN-US" style="font-family:;" "="">significa<span style="letter-spacing:-0.15pt;">nt difference (P</span></span><span lang="EN-US" style="font-family:" letter-spacing:-0.15pt;"=""> </span><span lang="EN-US" style=

关 键 词：Samples Extracted Chromatographic Separations 

分 类 号：R28[医药卫生—中药学]