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
Black tea which contains polyphenol is important for health benefits and it is
considered as antioxidant contents .
The extraction parameters, time and temperature and kind of solvent extraction, can
Influence the polyphenol concentrations of Blac
This paper presents a developed HPLC method for the determination of
caffeine and theobromine in different black and green tea infusion samples,
using different infusion methods, such as infusion with and without boiling,
repeated and continuous i
The scientific technological contemporary revolution, represented by the Internet and computer technics, has led to a new working environment named E-Business. In turn, this environment has produced some nomenclatures appropriate to its nature such a
This research aimed at studying the impact of firm characteristics on the level of
social responsibility disclosure by firms subject to the rules of The Syrian Commission on
Financial Markets and Securities. The research was applied on 38 companies
This paper aims at exploring man's relation to nature in John
Neihardt's Black Elk Speaks. It contrasts the European Americans'
and the American Indians' attitudes towards nature that may justify
their historical conflict.