التقييم الكمي لبعض الخواص الفيزوكيميائية والكافيين في بعض أنواع الشاي والقهوة المباعة في الاسواق المحلية

Authors

  • فاطمة حبوبة قسم هندسة وعلوم البيئة الاكايمية الليبية مصراتة
  • محمد الباقرمي قسم الكيمياء، كلية العلوم، جامعة مصراتة
  • جمال معيوف معيوف قسم الكيمياء، كلية الصيدلة، جامعة مصراتة

Keywords:

Caffeine, coffee, tea, pH, quantitative assessment, Misurata, Libya

Abstract

   In recent years, caffeine received increasing attention in food and pharmaceutical industries, due to its pharmacological properties which comprise stimulation of the central nervous system, peripheral vasoconstriction, relaxation of the smooth muscle and myocardial stimulation. The aim of this study was to determine the content of caffeine in eight types of tea (green, black) and four types of coffee. The content of caffeine was determined by using Spectrophotometric method. The content of caffeine has been associated with plant origin and growth conditions, as well as processing conditions.

The results of the present study showed that the pH values ​​of tea and coffee samples ranged between (6.10-4.81) and the moisture values ​​in the tea samples ranged between 2.04-8.10% where the lowest value was for T4 sample and the highest value for sample T8. While, the ash content of tea samples ranged between 4.71-7.52% and C12 sample was recorded the highest ash content in coffee samples with value 4.86%. The amount of caffeine was quantified by employing UV-vis Spectrophotometric technique at different conditions, the concentration of the caffeine in the tea and coffee solution was determined at different brewing time (1, 3 and 5 min), water volume (30, 70 and 150 ml) and temperature (80, 90 and 100 °C), where the maximum effect was at 100 ° C and 5 min, while the volume of the solution did not significantly affect the concentration of caffeine in the sample extract.

References

• حسين، فليحة حسن (2014). دراسة المحتوى الميكروبي وتقدير بعض العناصر المعدنية وبعض العلامات التجارية للشاي الأسود والأخضر ،مجلة الكوفة للعلوم الزراعية ،3 (2) , 172-178.

• هادي، سارة ثامر وثلج، كركز محمد (2016). تحديد الملوثات الميكروبية والكيميائية لنماذج الشاي في الأسواق العراقية، مجلة جامعة تكريت للعلوم الزراعية، 16 (4), 153-159.

• المركز الوطني للمواصفات والمعايير القياسية- دولة ليبيا، رقم (396) لسنة 2013م الإصدار الأول.

• مؤسسة المواصفات والمقايسس المملكة الارطنية الهاشمية، رقم (315) لسنة 2004م الإصدار الثالث.

• Alade, G. O., Vaikosen, E. N., & Ebeshi, B. U. (2012). Physicochemical analysis and evaluation of trace metals in some locally prepared herbal decoctions sold in Niger Delta region of Nigeria. International Journal of Pharmaceutical Research, 4(2), 96-99.

• Alhajali, A., & Al-Oklah, R. (2013). Quality characteristics of black tea brands in Syrian markets. Damascus University Journal for the Agircultural Sciences (Syria), 29(3), 23-35.

• Astill, C., Birch, M. R., Dacombe, C., Humphrey, P. G., & Martin, P. T. (2001). Factors affecting the caffeine and polyphenol contents of black and green tea infusions. Journal of agricultural and food chemistry, 49(11), 5340-5347.

• Bull, S., Brown, T., Burnett, K., Ashdown, L., & Rushton, L. (2015). Extensive literature search as preparatory work for the safety assessment for caffeine. EFSA Supporting Publications, EN-56, 1-42.

• Cozmuta, A. M., Conea, A., Peter, A., Mihaly-Cozmuta, L., & Nicula, C. (2013). Study the influence of work parameters on the leacheability of mineral elements into the coffee infusion. Print: Issn 2066-6845

• Garba, Z. N., Ubam, S., Babando, A. A., & Galadima, A. (2015). Quantitative assessment of heavy metals from selected tea brands marketed in Zaria, Nigeria. Journal of Physical Science, 26(1), 43-51.

• Higdon, J. V., & Frei, B. (2006). Coffee and health: a review of recent human research. Critical reviews in food science and nutrition, 46(2), 101-123. Hodge Jr, J. G., Scanlon, M., Corbett, A., & Sorensen, A. (2010). The consumable vice: caffeine, public health, and the law. J. Contemp. Health Low. & Poly, 27(1), 76-119.

• Kerrigan, S., & Lindsey, T. (2005). Fatal caffeine overdose: two case reports. Forensic Science International, 153(1), 67-69.

• Komatsu, Y., Suematsu, S., Hisanobu, Y., Saigo, H., Matsuda, R., & Hara, K. (1993). Effects of pH and temperature on reaction kinetics of catechins in green tea infusion. Bioscience, biotechnology, and biochemistry, 57(6), 907-910.

• Mayouf, J. A., Al Bayati, H. S., & Emmima, E. M. (2011). Quantitative Assessment of (Ca, Mg, K, Na, Fe, Mn) in Some Brands of Gre Tea Marketed in Libya.

• Nehlig, A., Daval, J. L., & Debry, G. (1992). Caffeine and the central nervous system: mechanisms of action, biochemical, metabolic and psychostimulant effects. Brain Research Reviews, 17(2), 139-170.

• Ogah, C. O., & Obebe, O. T. (2012). Caffeine content of cocoa and coffee beverages in Lagos, Nigeria. Journal of innovative research in engineering and sciences, 3(1), 404-411.

• Olson, K. R., Anderson, I. B., Benowitz, N. L., Blanc, P. D., Clark, R. F., Kearney, T. E., & Wu, A. H. (Eds.). (2007). Poisoning & drug overdose (Vol. 13). Lange Medical Books/McGraw-Hill.

• Phan, T. T. D., Kuban, V., & Krácmar, S. (2012). Determination of caffeine contents of coffee brands in the Vietnamese market. The Journal of Microbiology, Biotechnology and Food Sciences, 1, 995

• Ramalho, S. A., Nigam, N., Oliveira, G. B., de Oliveira, P. A., Silva, T. O. M., dos Santos, A. G. P., & Narain, N. (2013). Effect of infusion time on phenolic compounds and caffeine content inblack tea. Food research international, 51(1), 155-161.

• Rao, N. Z., & Fuller, M. (2017). The effect of time, roasting temperature, and grind size on caffeine and chlorogenic acid concentrations in cold brew coffee, scientific reports, 7(1), 17979.

• Ruxton, C. H. S. (2008). The impact of caffeine on mood, cognitive function, performance and hydration: a review of benefits and risks. Nutrition Bulletin, 33(1), 15-25.

• Street, R., Szakova, J. I. Ř. I. N. A., Drabek, O. N. D. Ř. E. J., & Mladkova, L. E. N. K. A. (2006). The status of micronutrients (Cu, Fe, Mn, Zn) in tea and tea infusions in selected samples imported to the Czech Republic. Czech Journal of Food Sciences, 24(2), 62.

• Subila, S., & Navis, M. S. (2016). Determination of caffeine in different tea samples. IOSR, Journal of Applied Chemistry (IOSR-JAC), 9, 75-78.

• Sud, R. G., & Baru, A. (2000). Seasonal variations in theaflavins, thearubigins, total colour and brightness of Kangra orthodox tea (Camellia sinensis (L) O Kuntze) in Himachal Peadesh, Journal of the science of food and agriculture, 80(9), 1291-1299.

• Suteerapataranon, S., Butsoongnern, J., Punturat, P., Jorpalit, W., & Thanomsilp, C. (2009). Caffeine in Chiang Rai tea infusions: Effects of tea variety, type, leaf form, and infusion conditions. Food Chemistry, 114(4), 1335-1338.

• Vaikosen, E. N., & Alade, G. O. (2011). Evaluation of pharmacognostical parameters and heavy metals in some locally manufactured herbal drugs. J Chem Pharm Res, 3(2), 88-97.

• Wanyika, H. N., Gatebe, E. G., Gitu, L. M., Ngumba, E. K., & Maritim, C. W. (2010). Determination of caffeine content of tea and instant coffee brands found in the Kenyan market. African Journal of Food Science, 4(6), 353-358.

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Published

2020-01-30

How to Cite

حبوبة ف., الباقرمي م., & معيوف ج. م. (2020). التقييم الكمي لبعض الخواص الفيزوكيميائية والكافيين في بعض أنواع الشاي والقهوة المباعة في الاسواق المحلية. Journal of Academic Research, 15, 195–212. Retrieved from https://lam-journal.ly/index.php/jar/article/view/199

Issue

Vol. 15 (2020)

Section

العلوم الهندسية والتطبيقية

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Copyright (c) 2020 فاطمة حبوبة، محمد الباقرمي، جمال معيوف

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