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The effect of pH on the slow-release behaviour of 1- and 2-naphthol from chitosan film

机译：pH对壳聚糖膜中1-萘酚和2-萘酚缓释性能的影响

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Chitosan (CTS) film was prepared by solution casting technique and characterized by means of Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM). Besides swelling index, the CTS film was investigated as a slow-release matrix for 1- and 2-naphthol (pesticide precursors) under different pH conditions. Swelling index of the CTS film was determined in different pH conditions i.e. pH 2.59, 6.84 (distilled water) and 11.02. The swelling order was found; pH 2.59??6.84??11.02. Similarly, the slow-release study was carried out at pH 2.59, 6.84 and 11.02. Over all, the release amount was found higher in acidic medium followed by neutral and basic medium. This behaviour might be due to higher swelling and dissolution of CTS film in acidic medium whereas in neutral and basic medium CTS film swells moderately.
机译：通过溶液流延技术制备壳聚糖（CTS）膜，并通过傅立叶变换红外光谱（FT-IR），热重分析（TGA）和扫描电子显微镜（SEM）对其进行表征。除了溶胀指数外，还研究了CTS膜作为1-萘酚和2-萘酚（农药前体）在不同pH条件下的缓释基质。在不同的pH条件，即pH 2.59、6.84（蒸馏水）和11.02下测定CTS膜的溶胀指数。发现了膨胀的顺序。 pH值2.59→＞ 6.84 ＞＞ 11.02。同样，在pH 2.59、6.84和11.02进行了缓释研究。总的来说，发现释放量在酸性介质中较高，其次是中性和碱性介质。此行为可能是由于CTS膜在酸性介质中较高的溶胀和溶解，而在中性和碱性介质中CTS膜适度溶胀。

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