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Register a new userA comparative study of caffeine release from carbopol gels and emulgels
دراسة مقارنة لتحرر الكافئين من هلاميات و هلاميات استحلابية محضرة من الكاربوبول
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لمى محمد الهوشي( باحث )
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تهدف هذه الدراسة إلى دراسة سلوك تحرر الكافئين من هلاميات و هلاميات استحلابية (emulgels) محضرة بواسطة الكاربوبول. حددت خواص المستحضرات الناتجة من حيث الفحص العياني, فحص الـ pH, فحص القدرة على المد و فحص التحرر. درست حركية تحرر الكافئين من هذه الهلاميات وفق الرتبة صفر و الأولى و وفق نموذج Higuchi و نموذج Korsmeyer- Peppas. استخدم اختبار ستيودنت t-test لتحليل النتائج إحصائياً عند مستوى دلالة 0.05. كانت الهلاميات شفافة بينما كانت الـ emulgels بيضاء و ناعمة و لماعة. كانت قيم الـ pH مناسبة و لم تتأثر قابلية الهلامة للمد عند تحويلها إلى emulgel بإضافة زيت البارافين. من جهة أخرى, نقصت كمية الكافئين المتحررة الكلية بدءاً من الـ emulgel بالمقارنة مع الهلامة العادية و كان التحرر في كلتا الحالتين وفق نموذج Higuchi و أشارت قيمة n إلى أن التحرر كان بشكل أساسي بواسطة الانتشار في حالة الهلامة الحاوية على كافئين منحل بينما ساهم الاسترخاء بشكل هام في تحرر الكافئين المعلق في الـ emulgel.
The objective of this study was to study and to analyze caffeine release from gel and emulgel prepared from carbopol. The properties of the preparations were determined (e.g. visual inspection, pH test, spreadability and in vitro release). The mechanisms of caffeine release were analyzed according to zero and first orders, and to Higuchi and Korsmeyer- Peppas models. Results were analyzed statistically using student t-test. The gels were transparent while emulgels were creamy, white and smooth. pH values were suitable for dermal application and spreadability was not changed in both cases. On the other hand, accumulated released amount of caffeine was decreased from emulgel in comparison with the gel. The release pattern was in accordance with Higuchi equation and n value referred that the diffusion was the main mechanism of release from the gel while the relaxation and the erosion contributed importantly in the release of suspended caffeine from emulgel.
References used
KALPESH C. A., JALPA S. P., MOINUDDIN M. S., JAYANT R. CH., NITIN M. M. Micro-emulsion based emulgel: a novel topical drug delivery system.Asian Pac J Trop Dis 2014; 4(Suppl 1): S27-S32
SHAH N.V., GHELANI T.K., SAINI V., JOSHI U.T., SETH A.K., CHAUHAN S.P., et al. Develpoment and characterizaton of micro-emulsion based system of aceclofenac. Indo Am J Pharm Res. 2011, 2(1), p: 110-124
BLOCK L. H. Medicated Topicals, Ch.44 in Remington. In: Lippincott Williams and Wilkins, editors. The science and practice of pharmacy 21th ed. Philadelphia; 2006
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The objective of this study was to prepare acceptable carbopol gels and to evaluate
the factors influencing the spreadability and release properties of a model hydrophilic
compound (caffeine). Results were analyzed statistically using student t-tes
t. The gels
were transparent at 1 and at 2% caffeine (with alcohol). Spreadability was decreased when
carbopol was increased and when caffeine quantity was changed (except at 2% carbopol).
Spreadability was affected statistically with change of cosolvent. Released caffeine
quantity (%) was increased with decreasing of carbopol quantity and increasing of caffeine
quantity introduced in the formula. Total caffeine quantity (%) was decreased with alcohol
presence. Caffeine release followed Higuchi pattern, e.g. diffusion was the principal
mechanism of caffeine release from these formulas.
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