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Số người truy cập: 106,961,748

 Carboxymethyl Bacterial Cellulose from Nata de Coco: Effects of NaOH
Tác giả hoặc Nhóm tác giả: Pornchai Rachtanapun*, Pensak Jantrawut, Warinporn Klunklin, Kittisak Jantanasakulwong, Yuthana Phimolsiripol, Noppol Leksawasdi, Phisit Seesuriyachan, Thanongsak Chaiyaso, Chayatip Insomphun, Suphat Phongthai, Sarana Rose Sommano, Winita Punyodom, Alissara Reungsang, Thi Minh Phuong Ngo
Nơi đăng: Polymers, (SCIE - Q1); Số: https://doi.org/10.3390/polym13030348;Từ->đến trang: 1-20;Năm: 2021
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Bacterial cellulose from Natade coco was prepared from the fermentation of coconut juice 30with Acetobacter xylinumfor 10 days at room temperature under sterile conditions. Carboxymethyl 31cellulose (CMC) was transformed from the bacterial cellulose from the Natade coco by carbox-32ymethylation using different concentrations of sodium hydroxide (NaOH) and monochloroacetic33acid (MCA) in an isopropyl (IPA) medium. The effects of various NaOH concentrations on the de-34gree of substitution (DS), chemical structure, viscosity, color, crystallinity, morphology and the ther-35mal properties of carboxymethyl bacterial cellulose powder from Natade coco (CMCn) were eval-36uated. In the carboxymethylation process, the optimal condition resulted fromNaOH amount of 3730g/100mL, as this provided the highest DS value (0.92). The crystallinity of CMCn declined after 38synthesis but seemed to be the same in each condition. The mechanical properties (tensile strength 39and percentage of elongation at break), water vapor permeability (WVP) and morphologyofCMCn 40films obtained from CMCn synthesis using different NaOH concentrations were investigated . The 41tensile strength of CMCn film synthesized with 30 g/100 mL of NaOH concentration increased, 42however it declined when the amount of NaOH concentration was too high. This result correlated 43with the DS value. The highest percent elongation at break was obtained from CMCn films synthe-44sized with 50g/100 mL of NaOH concentrations, whereas the elongation at break decreased when 45NaOH concentration increased to 60g /100 mL
ABSTRACT
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