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首页> 外文期刊>Der Pharma Chemica: journal for medicinal chemistry, pharmaceutical chemistry and computational chemistry >Isolation and Characterization of Microcrystalline Cellulose from Papaya Stem
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Isolation and Characterization of Microcrystalline Cellulose from Papaya Stem

机译：木瓜茎中微晶纤维素的分离与表征

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Microcrystalline cellulose (MCC) was isolated from papaya stem, characterized and compared with a commercial brand MCC. The dried pulverized papaya stem was subjected to alkaline treatment using aqueous NaOH and NaOCl solutions. Alpha cellulose obtained was modified by partial hydrolysis using 2.5 M HCl at boiling temperature to produce microcrystalline cellulose. The Physicochemical properties such as bulk, tapped and true densities, degree of polymerization, particle sizes, moisture content, angle of repose etc were examined and compared with a commercial brand sample (C-MCC). Results have shown that the percentage yields of alpha cellulose and CU-MCC obtained from the starting dried stem material were 23.78 and 20.70, respectively. Fourier Transform Infrared (FT-IR) spectra of CU-MCC and C-MCC confirmed the presence of OH and (C=O) carbonyl functional group which are the main characteristics of cellulose. Scanning Electron Microscopy (SEM) showed individual rod-like and flat-shaped plank-like fiber structures with few bundled crystal packed forms for the CU-MCC and C-MCC respectively. The C-MCC has a high thermal stability at 408°C when compared to 367°C of the hydrolysed CU-MCC. This may be resulting from the morphological characteristics of the fiber structures. CU-MCC had poor powder flow properties and an appreciable thermal resistance.
机译：从木瓜茎中分离出微晶纤维素（MCC），并与商业品牌MCC进行了比较。使用NaOH和NaOCl水溶液对干燥的木瓜粉进行碱处理。通过在沸腾温度下使用2.5 M HCl进行部分水解，对所得的α-纤维素进行改性，从而制得微晶纤维素。检查了其物理化学性质，例如松密度，堆积密度和真实密度，聚合度，粒度，水分含量，休止角等，并与商业品牌样品（C-MCC）进行了比较。结果表明，从起始干茎材料获得的α纤维素和CU-MCC的百分产率分别为23.78和20.70。 CU-MCC和C-MCC的傅立叶变换红外（FT-IR）光谱证实存在OH和（C = O）羰基官能团是纤维素的主要特征。扫描电子显微镜（SEM）显示了分别为CU-MCC和C-MCC的单个棒状和扁平形板状纤维结构，几乎没有捆绑的晶体堆积形式。与水解的CU-MCC的367°C相比，C-MCC在408°C时具有很高的热稳定性。这可能是由于纤维结构的形态特征引起的。 CU-MCC具有较差的粉末流动性和明显的耐热性。

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