chemical analysis and characteristics of black tea produced in north of iran
نویسندگان
چکیده
tea might be considered as the most popular drink in iran as well as some other parts of theworld. its popularity to some extent depends on its flavor and some other constituents present in its leaves orextract. black tea samples from various agro climatic zones of northeast of iran were evaluated for the chemicalconstituents, polyphenols and metal analysis that determine the quality perception. black tea epicatechins,namely epigallocatechin gallate (egcg), epicatechin gallate (ecg), epigallocatechin (egc) and epicatechin(ec) were also assessed by hplc. furthermore, for metal analysis, the level of mn, cu, pb and ni elementswere evaluated in black tea from the five tea growing districts of north iran. the results confirmed that the totalpolyphenol concentration in black tea varied from 17.10 g/100g to 12.20 g/100g, whereas the catechins contentranged from 17.20 mg/g to 15.80 mg/g. furthermore, significant differences were detected in the chemicalscontent between different black tea samples. in general, the contents of caffeine and water extract in lahijansample were found to be the highest. the mn content was found in the range of 702 and 731 mg/kg and copperranged between 24.30 and 32.60 mg/kg. the lead content in the samples were in the range of 0.22 and 0.35 mg/kg. nickel concentration in black tea leaves ranged between 2.31 and 3.67 mg/ kg. the results of the evaluationof tea confirmed that the level of elemental contents in all of the tea sample were completely lower than theacceptable limit according to the international standards. it was noted that in different black tea samples, lahijanproduced the best quality tea followed by tonekabone.
منابع مشابه
Chemical Analysis and Characteristics of Black Tea Produced in North of Iran
Tea might be considered as the most popular drink in Iran as well as some other parts of theworld. Its popularity to some extent depends on its flavor and some other constituents present in its leaves orextract. Black tea samples from various agro climatic zones of northeast of Iran were evaluated for the chemicalconstituents, polyphenols and metal analysis that determine the quality perception...
متن کاملa swot analysis of the english program of a bilingual school in iran
با توجه به جایگاه زبان انگلیسی به عنوان زبانی بین المللی و با در نظر گرفتن این واقعیت که دولت ها و مسئولان آموزش و پرورش در سراسر جهان در حال حاضر احساس نیاز به ایجاد موقعیتی برای کودکان جهت یاد گیری زبان انگلیسی درسنین پایین در مدارس دو زبانه می کنند، تحقیق حاضر با استفاده از مدل swot (قوت ها، ضعف ها، فرصتها و تهدیدها) سعی در ارزیابی مدرسه ای دو زبانه در ایران را دارد. جهت انجام این تحقیق در م...
15 صفحه اولrole of cultural iran in promotion of multilaieralism in central asia and caucasus
cultural iran is a scope that is more extended than the political territories of iran as a political unit. this concept means that cultural geography(mehdi moghanlo-1383-1) of iran is greater than its political geography which, according to history, has a long history extending west-east from kandahar to the euphrates and north-south from the persian gulf to the caucasus including transoxiana a...
15 صفحه اولthe stady and analysis of rice agroclimatology in lenjan
the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...
15 صفحه اولthe analysis of the role of the speech acts theory in translating and dubbing hollywood films
از محوری ترین اثراتی که یک فیلم سینمایی ایجاد می کند دیالوگ هایی است که هنرپیش گان فیلم میگویند. به زعم یک فیلم ساز, یک شیوه متأثر نمودن مخاطب از اثر منظوره نیروی گفتارهای گوینده, مثل نیروی عاطفی, ترس آور, غم انگیز, هیجان انگیز و غیره, است. این مطالعه به بررسی این مسأله مبادرت کرده است که آیا نیروی فراگفتاری هنرپیش گان به مثابه ی اعمال گفتاری در پنج فیلم هالیوودی در نسخه های دوبله شده باز تولید...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
journal of food biosciences and technologyناشر: tehran science and research branch, islamic azad university
ISSN 2228-7086
دوره 06
شماره 1 2016
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023