CATECHIC TANNIN CONTENT OF DIFFERENT TEA SAMPLES

Yıl 2022, Cilt: 5 Sayı: 2, 93 - 98, 30.06.2022

Gülbahar Özge Alim Toraman Nur Tan

https://doi.org/10.26650/JARHS2022-1071325

Öz

Objective: Camellia sinensis (tea) which is a member of the Theaceae family can be found in many tropical and subtropical areas with diverse cultural forms. It is grown only in the Eastern Black Sea Region of Turkey and originated from China and Japan and is defined as a small evergreen tree. White, green, and black teas are all made from the Camellia sinensis plant species. Scientific studies have shown that distinct types of tea have emerged because of different fermentation processes in the production stages. In this study, the macroscopic and microscopic analysis, diagnosis of tannin, and catechical tannin determination have been conducted on fifteen Camellia sinensis samples purchased from various places. Material and Methods: Five grams of powdered tea samples were extracted with 50 ml of hot water and the catechical tannin determination in the extracts was made by gelatin, ferric and stiasny tests.
Results: In the macroscopical examination of A-E (white, green, and black) tea samples the researchers observed no color, odor, or any other substance. When all the samples were microscopically examined, reaserch detected the presence of idioblast which is the characteristic structure of the tea.
Conclusion: There was a positive result regarding a diagnosis of tannin and catechical tannin. Catechin substances were determined in each of the one gram samples; The E white tea 0,1300 g, green tea 0,1500 g, black tea 0,0693 g; the D white tea 0,1889 g, green tea 0,1228 g, black tea 0,0710 g; the C white tea 0,2118 g, green tea 0,1306 g, black tea 0,0436 g; the A white tea 0,2400 g, green tea 0,1972 g, black tea 0,0686 g; the B white tea 0,3317 g, green tea 0,1380 g, black tea 0,0517 g.

Anahtar Kelimeler

Camellia sinensis, catechin, white tea, green tea, black tea

FARKLI ÇAY ÖRNEKLERİNİN KATEŞİK TANEN İÇERİĞİ

Öz

Amaç: Theaceae familyasının bir üyesi olan Camellia sinensis (çay), farklı kültürel formlarda, birçok tropikal ve subtropikal bölgede bulunabilir. Çin ve Japonya kökenli olup, Türkiye’de sadece Doğu Karadeniz Bölgesinde yetişen, yaprak dökmeyen küçük bir ağaç olarak tanımlanmaktadır. Beyaz, yeşil ve siyah çayların hepsi Camellia sinensis türünden elde edilir. Bilimsel çalışmalar, üretim aşamalarındaki farklı fermantasyon süreçleri nedeniyle farklı çay türlerinin ortaya çıktığını göstermektedir. Bu araştırmada beş farklı markadan satın alınan C. sinensis örneklerinde (A-E) makroskopik ve mikroskobik analizler, tanen tanısı ve kateşik tanen tayini yapıldı. Gereç ve Yöntem: Beş gram toz çay numunesi 50 ml sıcak su ile ekstre edilmiş ve ekstrelerdeki kateşik tanen teşhisi jelatin, ferrik ve stiasny test- leri ile analiz edilmiştir. Bulgular: A-E (her bir markadan beyaz, yeşil ve siyah çay) numunelerinin makroskopik incelemesi sırasında hiçbir renk, koku veya başka bir madde gözlenmemiştir. Örnekler mikroskobik olarak incelendiğinde tüm örnekler- de çayın karakteristik yapısı olan idioblast varlığı tespit edilmiştir. Sonuçlar: Tüm örnekler tanen ve kateşik tanen teşhisinde pozitif sonuç vermiştir. Kateşin içeriği 1 gramlık numunelerde; E beyaz çay 0,1300 gr, yeşil çay 0,1500 gr, siyah çay 0,0693 gr; D beyaz çay 0,1889 gr yeşil çay 0,1228 gr siyah çay 0,0710 gr; C beyaz çay 0,2118 g yeşil çay 0,1306 g siyah çay 0,0436 g; A beyaz çay 0,2400 g, yeşil çay 0,1972 g, siyah çay 0,0686 g; B beyaz çay 0,3317 gr, yeşil çay 0,1380 gr, siyah çay 0,0517 gr olarak tespit edilmiştir.

Anahtar Kelimeler

Camellia sinensis, kateşin, beyaz çay, yeşil çay, siyah çay

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