Effects of multiscale rice straw (Oryza sativa) as reinforcing filler in montmorillonite-polyvinyl alcohol biocomposite packaging film for enhancing the storability of postharvest mango fruit (Mangifera indica L.)
Effects of multiscale rice straw (Oryza sativa) as reinforcing filler in montmorillonite-polyvinyl alcohol biocomposite packaging film for enhancing the storability of postharvest mango fruit (Mangifera indica L.)
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DOI：
10.1016/j.clay.2018.03.008
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发表时间：
2018-06-15
影响因子：
5.6
通讯作者：
Jayaramudu, J.
中科院分区：
文献类型：
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作者：
Perumal, Anand Babu;Sellamuthu, Periyar Selvam;Jayaramudu, J.
以稻秆为原料制备生物可降解材料，以蒙脱土-聚乙烯醇（Mt-PVA）为填料，制备了测定芒果果实贮藏性的生物复合包装膜。用碱氢氧化钠（NaOH）、亚氯酸钠（NaClO2）和乙酸（CH3COOH） （x 3次）处理RS （x 3次）。随后，通过硫酸（H2SO4）水解分离纤维素纳米晶体（CNC）。提取的CNC以长度(L)为831 +/- 45.0 nm，直径(D)为44 +/- 12 nm进行缩放，得到宽高比（L/D）为18.8。透射电镜结果显示CNC的针状结构。x射线衍射表明，每次处理后纤维的结晶度都有所提高。利用场发射扫描电镜对未经处理、处理的RS纤维和生物复合材料进行形态学观察。我们的研究表明，当填料浓度增加到6 wt%时，生物复合膜的热稳定性和拉伸性能显著改善。此外，包装后的芒果果实保质期延长至19 +/- 2 d，质量参数（苯酚、类黄酮含量和DPPH抗氧化活性）良好，质量损失减少，CO2含量增加，O-2含量低。本研究揭示了生物纳米复合薄膜对提高新鲜收获芒果的储存性的有效性。
Biodegradable materials, prepared from rice straws (RS), were used as fillers in montmorillonite clay-polyvinyl alcohol (Mt-PVA) matrix in order to develop a biocomposite packaging film for determining the storability of mango fruit. The RS was treated (x 3 times) with alkali sodium hydroxide (NaOH) followed by sodium chlorite (NaClO2) and acetic acid (CH3COOH) (x 3 times). Subsequently, cellulose nanocrystals (CNC) were isolated by sulfuric acid (H2SO4) hydrolysis. The extracted CNC were scaled at a length (L) of 831 +/- 45.0 nm and a diameter (D) of 44 +/- 12 nm to obtain an aspect ratio (L/D) of 18.8. Transmission electron microscopy results showed the needle-like structures of CNC. X-ray diffraction showed that the crystallinity of the fiber increased after every treatment. Morphological observations of the untreated, treated RS fibers and biocomposites were evaluated by using field emission scanning electron microscopy. Our study suggested that the thermal stability and tensile properties of the biocomposite films significantly improved by increasing the filler concentration up to 6 wt%. Furthermore, the mango fruit sealed with packaging film exhibited a shelf life extension until 19 +/- 2 d with good quality parameters (phenol, flavonoid content and DPPH antioxidant activity), reduced mass loss, increased CO2 and low O-2 level. The present study revealed the efficiency of the bio-nanocomposite film for improving the storability of freshly harvested mangoes.