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Register a new userQuality characteristics of black tea brands in Syrian markets
دراسة بعض مواصفات الجودة لأصناف الشاي الأسود الموجودة في الأسواق السورية
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Damascus University ورقة بحثية
Publication date
2012
fields
Food Sciences
and research's language is
العربية
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Shamra Editor
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أجري البحث في مختبرات كلية الزراعة قسم علوم الأغذية-جامعة دمشق خلال المدة 2009-2010 بجمع 22 عينة شاي أسود من الأسواق السورية لدراسة مواصفات الجودة مـن خـلال تحديـد نـسبة الرطوبة، و الخلاصة المائية، الكافيين، و الرماد الكلي، و الرماد غير المنحل في حمض كلور الماء المخفف، و الرماد المنحل بالماء و قلوية الرماد المنحل بالماء و الغش بالنباتات الغريبة باستخدام الفحص المجهـري للنسيج. بينّت النتائج أن العينات المدروسة كانت مطابقة للمواصفة القياسية السورية رقم 286 لعـام 2003 بالنسبة إلى مواصفات الجودة المذكورة سابقاً جميعها باستثناء نسبة الكافيين التي كانت أقل مـن الحـد الأدنى الذي تحدده المواصفة السورية؛ و ذلك في 4 عينات فقط. كما بينت النتـائج عـدم وجـود الغـش بالنباتات الغريبة للعينات المدروسة كلّها.
Twenty two samples of black tea were collected from local Syrian markets during 2009-2010 to study the quality characteristics of tea in terms of moisture، water extract، caffeine، total ash، water soluble ash، alkalinity of soluble ash, insoluble ash in diluted hydrochloric acid in addition to microscopic examination. Results showed that all tested samples were identical to the Syrian Standard No. 286/2003 for all above quality specifications، except for caffeine percent which was less than the standard in 4 samples. The results also showed that there was no adulteration with foreign plants nor exhausted tea leaves.
References used
AOAC. 2000. Official method of analysis of the association of official analytical chemists، 979.11, caffeine in roasted coffee, chromatographicspectrophotometer method. 17ed، Maryland. USA
Ashihara، H. and A. Crozie. 1999. Biosynthesis and metabolism of caffeine and related purine alkaloids in plants. Adv. Bot. Res. 30: 118-205
Ashihara. H. and A. Crozier. 2001. Caffeine: A well known but little mentioned compound in plant science. Trends Plant Sci. 6: 407-413
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