油棕基纳米纤维素增强壳聚糖纳米复合材料的结构与性能及其在丁酸丁酯高效合成中的应用。
Structure and properties of oil palm-based nanocellulose reinforced chitosan nanocomposite for efficient synthesis of butyl butyrate.
机构信息
Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
出版信息
Carbohydr Polym. 2017 Nov 15;176:281-292. doi: 10.1016/j.carbpol.2017.08.097. Epub 2017 Aug 24.
In this study, nanocellulose (NC) was successfully extracted from oil palm frond leaves (OPFL) using a combination of bleaching, alkaline treatment and acid hydrolysis. X-ray diffractogram revealed the extracted NC was crystalline with a crystallinity index of 70.2%. This indicates its suitability as nano-fillers for preparing the chitosan/nanocellulose (CS-NC) supports to immobilize Candida rugosa lipase (CRL) to produce the CRL/CS-NC biocatalysts. FTIR, FESEM and TGA characterizations of the CRL/CS-NC confirm the CRLs were successfully conjugated to the CS-NC supports. The air-dried CS-NC supports gave satisfactory immobilization of the CRLs (5.2mg/g) with the resultant CRL/CS-NCs catalysed conversions of ≥80% of butyl butyrate within 6h. Time course reaction profile revealed that 76.3% butyl butyrate conversion was achieved at 4h immobilization time using 3mg/mL of CRL/CS-NCs. NMR analyses on the purified butyl butyrate confirmed that the ester was successfully synthesized.
在这项研究中，成功地从油棕叶片（OPFL）中提取出纳米纤维素（NC），方法是结合漂白、碱性处理和酸水解。X 射线衍射图显示，提取的 NC 是结晶的，结晶度指数为 70.2%。这表明它适合用作纳米填充剂，用于制备壳聚糖/纳米纤维素（CS-NC）载体，以固定 Candida rugosa 脂肪酶（CRL），从而生产 CRL/CS-NC 生物催化剂。CRL/CS-NC 的 FTIR、FESEM 和 TGA 表征证实了 CRL 成功地结合到 CS-NC 载体上。空气干燥的 CS-NC 载体对 CRL 的固定化效果令人满意（5.2mg/g），所得 CRL/CS-NC 在 6 小时内催化丁酸丁酯的转化率≥80%。时程反应曲线显示，在 4 小时的固定化时间内，使用 3mg/mL 的 CRL/CS-NC 可实现 76.3%的丁酸丁酯转化率。对纯化的丁酸丁酯的 NMR 分析证实了酯的成功合成。
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