اثر مراحل پلاسیدن، مالش دهی، تخمیر و خشک کردن چای سیاه گیلانی بر محتوای فنولی و خواص آنتی اکسیدانی آن

نویسندگان
رضا فرهمندفر
حدیث عظیمی نژاد
گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران
10.52547/fsct.18.112.1
چکیده
چای سیاه گیلانی طی تخمیر برگ­های تازه Camelia sinensis var. assamica حاصل می‌گردد. این پژوهش، با هدف بررسی اثر فرآیند تولید چای و روش دم کردن آنها با روش­های ماکروویو و متداول بر محتوای فنولی، فلاونوئیدی و فعالیت آنتی‌اکسیدانی (آزمون مهار رادیکال‌های DPPHو قدرت احیاکنندگی اتم آهن) صورت گرفت. نتایج نشان داد در اثر فرآیند تخمیر خواص آنتی‌اکسیدانی و محتوای فنولی چای تغییر کرد و همچنین روش دم کردن چای نیز بر این خصوصیات مؤثر بود. بالاترین محتوای فنولی و فلاونوئیدی و فعالیت آنتی‌اکسیدانی را مرحله مالش‌دهی تحت دم کردن با روش ماکروویو نشان داد. در حالی­که، کمترین محتوای فنولی و فلاونوئیدی مربوط به مرحله پلاسیدن تحت دم کردن با روش ماکروویو و کمترین فعالیت آنتی‌اکسیدانی نیز مربوط به تیمار چای تحت روش دم کردن متداول بود. بنابراین روش ماکروویو با قابلیت استخراج بالا و کاهش زمان فرآیند می‌تواند در صنعت غذا جایگزین روش­های معمول گردد.
کلیدواژه‌ها
آنتی‌اکسیدان
تخمیر
چای
فرآوری
گیلان

موضوعات

عنوان مقاله English

Effect of withering, rolling, fermentation and drying steps of Gilan's black tea on its phenolic content and antioxidant properties

نویسندگان English

Reza Farahmandfar
HADIS AZIMINEZHAD
Department of Food Science and Technology, Sari Agricultural Sciences and Natural Resources University (SANRU), Iran
چکیده English

Gilan’s black tea is obtained via the fermentation of the fresh leaves of Camelia sinensis var. assamica. In this study, the effect of tea production process and brewing methods, microwave and conventional methods were studied on their phenolic and flavonoid content and antioxidant activity (DPPH radical scavenging assay, iron atom reducing power). The results showed that due to the fermentation process, the antioxidant properties and phenolic content of tea were changed and also the tea brewing method was effective on these properties and the highest phenolic and flavonoid contents and antioxidant activity were determined in the rolling step on the microwave brewing method. While the lowest phenolic and flavonoid contents were observed in the withering step on microwave brewing method and the lowest antioxidant activity was related to the tea treatment under conventional brewing. Therefore, the microwave method with high extraction capability and reduced the processing time can be an alternative to the conventional methods in the food industry.

کلیدواژه‌ها English

Antioxidant
Fermentation
Tea
Processing
Gilan
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