I-Black Tea, eyaziwa ngokunambitheka kwayo okucebile futhi okuqinile, isiphuzo esithandwayo esijatshulelwa yizigidi emhlabeni jikelele. Enye yezinto ezithakazelisa zetiye elimnyama lingumbala walo obomvu ohlukile lapho ubhujiswa. Lo mbhalo uhlose ukuhlola izizathu zesayensi ngemuva kombala obomvu wetiye elimnyama, ukhanyisela izinqubo zamakhemikhali ezifaka isandla kule nto.
Umbala obomvu wetiye elimnyama ungabangelwa ubukhona bezimpawu ezithile eziguqulwa ngamakhemikhali ngesikhathi sokwenza itiye. Amakhompiyutha aphambili abhekene nombala obomvu angama-sweerubigins kanye neTheaflavins, ezakhiwa nge-oxidation of Tea polyphenols ngesikhathi sokuvutshelwa noma inqubo ye-oxidation ebekhona ebhobeni emnyama eqhubeka.
Ngesikhathi sokukhiqizwa kwetiye elimnyama, amaqabunga etiye afakwa ngaphansi kochungechunge lwezinqubo, kufaka phakathi ukushwabana, ukugoqa, oxidation, nokomisa. Kuhamba ngesikhathi sesigaba se-oxidation ukuthi ama-polyphenols wetiye, ikakhulukazi ama-catechins, abhekana noxidation enzymatic, okuholela ekwakhekeni kweThearubigins futhiI-Theaflavins. Lezi zinhlanganisela zibhekele umbala obomvu ocebile kanye nokunambitheka kwesimo setiye elimnyama.
Izulu, ikakhulukazi, amakhompiyutha amakhulu ama-polyphenolic alohlo-nsundu ngombala. Zakhiwa nge-polymerization of Catechins namanye ama-flavonoroids akhona emaqabungeni etiye. Ngakolunye uhlangothi, ama-theaflavins ama-compoom amancane amancane ama-polyphenolic anikela ngombala obomvu wetiye elimnyama.
Umbala obomvu wetiye elimnyama uqiniswa futhi ngokuba khona kwama-anthocyanins, okungamabala ancibilikisiwe amanzi atholakala kwezinye izilimi zetiye. Lezi zingulube zingadlulisela i-hue ebomvu etiyeni elenziwe nge-brewled, engeza kuphrofayela yayo yombala jikelele.
Ngaphezu kwezinguquko zamakhemikhali ezenzeka ngesikhathi sokucutshungulwa kwetiye, izici ezinjengezinhlobonhlobo zezitshalo zetiye, izimo ezikhulayo, kanye namasu wokucubungula nazo zingathonya umbala obomvu wetiye elimnyama. Isibonelo, izinga le-oxidation, isikhathi sokuvutshelwa, kanye nezinga lokushisa lapho kulungiswa khona amaqabunga etiye angathinta umbala wokugcina wetiye elihlanganisiwe.
Ekuphetheni, umbala obomvu wetiye elimnyama ungumphumela wokudlala okuhlangene kwamakhemikhali namakhemikhali ahilelekile ekukhiqizweni kwawo. I-Thearubigins, eTheaflavins, nama-anthocyanins ababambiseko abalulekile kwi-hue ebomvu yetiye elimnyama, ngokwakhiwa kwawo kanye nokuxhumana ngesikhathi sokucubungula ukucubungula umbala othandekayo.
Izinkomba:
I-Gramza-Michałowska A. Tea Infusions: Umsebenzi wabo we-antioxidant kanye nephrofayili ye-phenolic. Ukudla. 2020; 9 (4): 507.
UJilani T, iqbal m, uNadeem m, et al. Ukucutshungulwa kwetiye emnyama kanye nekhwalithi yetiye elimnyama. J Food SCI Technol. 2018; 55 (11): 4109-4118.
UJumtee K, KOMURA H, Bamba T, Fukusaki E. Ukuqashelwa kwetiye letiye eliluhlaza laseJapan ngegesi i-chromatography / Ukususelwa kweminwe kwe-hydrophilic metabolite esekelwe kwi-hydrophilic. J Biosci Bioeng. 2011; 111 (3): 255-260.
Komes d, Horžić d, Belščak-cvitanović a, et al. Ukwakheka kwe-Phenolic kanye nezakhiwo ze-antioxidant zezinye izitshalo zokwelapha ezithintwe isikhathi sokukhishwa kanye ne-hydrolysis. I-phytochem anal. 2011; 22 (2): 172-180.
Isikhathi sePosi: Meyi-09-2024
