EXTRACTION OF CMC FROM CORNCOB AND ITS APPLICATION AS COATING AGENT ON MANGO FRUIT
DOI:
https://doi.org/10.14456/lsej.2023.25Keywords:
Carboxymethyl cellulose, Corncob, Coating agentAbstract
This study aimed to synthesize carboxymethyl cellulose (CMC) from corncobs for use as coating agent on mango. Cellulose is converted by etherification under suitable conditions and then finally purified. Then, the extracted CMC was used as a film for coating the mango fruit. Under the optimized reaction conditions, the extracted CMC had a degree of substitution (DS) of 0.12. The results showed that the FTIR spectra of the obtained CMCs exhibited strong absorption bands in the range of 1600-1700 cm-1, which was related to the carbonyl group (C=O) vibration stretching absorption. The absorption in the 1400–1450 cm-1 region is due to symmetrical deformations of CH2 groups. The strong absorption bands in the range of 1200–1000 cm-1 are due to the stretching vibration of the ether (-O-). The FT-IR results confirmed CMC modification. Thermal analysis found that CMC had a melting temperature in the range of 163.2-181.4 oC. In degradation, CMC can be completely decomposed within 72 hrs using the soil embedding method. The results of the water vapor permeability (WVP) test showed that CMC and glycerol affected the film properties. Increasing CMC content, water vapor permeability (WVP) decreased. In contrast, with increasing glycerol, increased WVP. We conclude that fruits coated with the obtained CMC from corncob could maintain the quality of Nam Dok Mai Mango (Mangifera Indica Linn.).
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