کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7594650 | 1492119 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The major factors influencing the formation of sediments in reconstituted green tea infusion
ترجمه فارسی عنوان
عوامل اصلی موثر در تشکیل رسوبات در تزریق چای سبز بازسازی شده
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
The effects of Ca2+, caffeine and polyphenols on the formation of reversible tea sediments (RTS) and irreversible tea sediments (IRS) in green tea infusion were studied. Adding Ca2+ (2Â mmol/l) was found to increase the formation of RTS by 8% and IRS by 92%, while adding chelating ions of Na2EDTA significantly decreased the amount of RTS by 14.6%, but not the amount of IRS. Under acid conditions, Ca2+ combined with oxalic ions to form indissoluble oxalate that is the principal constituent of IRS, despite the existence of the chelating ions. Decaffeination largely inhibited the formation of RTS (73%) and IRS (60%), even in the presence of Ca2+. The amount of sediment could be reduced by removing polyphenols using polyvinyl-polypyrrolidone. The results suggest that sediment formation in green tea infusions can be inhibited by lowering the concentration of Ca2+, caffeine or polyphenols.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 172, 1 April 2015, Pages 831-835
Journal: Food Chemistry - Volume 172, 1 April 2015, Pages 831-835
نویسندگان
Yong-Quan Xu, Xiong-Fei Hu, Ping Tang, Yong-Wen Jiang, Hai-Bo Yuan, Qi-Zhen Du, Jun-Feng Yin,