تاثیر فرآوری، زمان و منطقه برداشت بر فعالیت آنتی اکسیدانی و ترکیبات شیمیایی چای

نویسندگان
1 دانش آموخته مقطع ارشد علوم و مهندسی صنایع غذایی، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران
2 استادیار، گروه علوم و مهندسی صنایع غذایی، واحد لاهیجان، دانشگاه آزاداسلامی
3 استادیار، گروه علوم و مهندسی صنایع غذایی، واحد لاهیجان، دانشگاه آزاداسلامی، لاهیجان، ایران
چکیده
چای پس از آب یکی از پرمصرفترین نوشیدنی‌های جهان است و به علت ترکیبات شیمیایی موجود در آن نظیر پلیفنل‌ها، ترکیبات آنتی‌اکسیدانی و کافئین که سودمند هستند، مورد توجه قرار گرفته است. عواملی مانند فرآوری برگ چای، زمان برداشت برگ و منطقه کشت می‌تواند بر روی ترکیبات برگ چای تاثیر بگذارد. این تحقیق در طرح فاکتوریل و در غالب طرح کاملا تصادفی شامل متغیرهای مستقل به صورت برگ سبز خام، چای سبز و چای سیاه فرآوری شده است و متغیرهای وابسته در این طرح از جمله اندازه گیری میزان پلی‌فنل، فعالیت آنتی‌اکسیدانی، میزان کافئین و ویژگی‌های خاک می‌باشد که در دو فصل برداشت بهار(اردیبهشت) و تابستان(تیر) و دو منطقه کشت شرق گیلان(لاهیجان) و غرب گیلان(فومن)، انجام شده است. بر طبق نتایج به دست آمده اثرات متقابل بدین صورت بود، میزان رطوبت در چای سبز بهاره منطقه فومن (83/78 %) در بیشترین حالت خود و چای سبز تابستانه منطقه فومن (22/6 %) کمترین مقدار را دارا بود. به همین ترتیب بیشترین میزان ماده جامد نیز در چای سبز تابستانه منطقه فومن (76/93 %) و کمترین میزان آن در برگ سبز بهاره فومن (20/21 %) گزارش شد. همچنین بالاترین میزان کافئین در چای سبز بهاره فومن (65/2 %) و کمترین مقدار آن در برگ سبز تابستانه لاهیجان(87/1 %) گزارش گردید و بیشترین و کمترین میزان ترکیبات آنتی‌اکسیدانی به ترتیب در برگ سبز چای لاهیجان در هردو چین بهار و تابستان و چای سیاه تابستانه فومن (27/57 %) دیده شد. علاوه بر این بیشترین میزان ترکیبات پلی‌فنلی در چای سبز بهاره فومن (37/12 %) و کمترین میزان آن در چای سبز تابستانه فومن (29/12 %) مشاهده گردید.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The impact of processing, time, and harvesting location on the antioxidant activity and chemical compounds of tea

نویسندگان English

negin samizadegan 1
Mandana Tayefe 2
Fadayi Fadayi Eshkiki 1
AZIN NASROLLAH ZADEH 3
sahar Doaie 3
1 Graduated in Food Science and and Technology, Lahijan Branch, Islamic Azad University, Lahijan, Iran
2 Assistant Professor, Department of Food Science and Technology, Lahijan Branch, Islamic Azad University
3 Assistant Professor, Department of Food Science and Technology, Lahijan Branch, Islamic Azad University
چکیده English

Tea, after water, is one of the most consumed beverages in the world due to its chemical compounds such as polyphenols, antioxidant compounds, and caffeine, which are beneficial. Factors such as tea leaf processing, harvest time, and cultivation region can affect the composition of tea leaves. This research was conducted in a factorial design and as a completely randomized design, with independent variables including raw green tea leaves, processed green tea, and black tea, and dependent variables in this design include measuring the amount of polyphenols, antioxidant activity, and The amount of caffeine and soil properties have been carried out in two harvest seasons: spring (May) and summer (July) and two cultivation zones in the east of Guilan (Lahijan) and west of Guilan (Fouman). According to the results, the interaction effects were, the moisture content of spring green tea in Fouman region (78.83%) was at its highest and summer green tea in Fouman region (6.22%) had the lowest value. The highest amount of solid matter was reported in summer green tea from the Fuman region (93.76%), while the lowest amount was found in spring green tea leaves from Fuman (21.20%) Additionally, the highest caffeine content was observed in spring green tea from Fuman (2.65%), and the lowest amount was in summer green tea leaves from Lahijan (1.87%) The highest and lowest levels of antioxidant compounds were also seen in both spring and summer green tea leaves from Lahijan, as well as in summer black tea from Fuman (57.27%). Furthermore, the highest amount of polyphenols was observed in the spring green tea from Fouman (12.37%), while the lowest amount was found in the summer green tea from Fouman (12.29%).

کلیدواژه‌ها English

Polyphenol
Tea
processing method
Caffeine
cultivation region
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