Preparation and Characterization of Biodegradable Esterified Modified Starch

Author(s): Yan Lu, Xue Gong, Jianghong Liu, Hong Sun

Journal Name: Recent Innovations in Chemical Engineering
Formerly Recent Patents on Chemical Engineering

Volume 8 , Issue 2 , 2015


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Abstract:

Esterified modified corn starch has been prepared with corn starch as raw material, acetic acid as activator, acetic anhydride as esterifying agent, and concentrated sulfuric acid as catalyst. Certain substitution degree (DS=0~0.5) of starch acetate (SA) was prepared. Esterified starches reaction conditions were optimized by single factor and orthogonal experiment. Esterified starch was characterized using Fourier transforms infrared spectroscopy (FTIR), scanning electron microscope (SEM) and differential scanning calorimetry (DSC) analysis method. The experimental results show that under the conditions where temperature is 75oC, time is 1.5h, concentrated sulfuric acid is 0.13mL, acetic acid is 0.7 (volume ratio of acetic acid and acetic anhydride), substitution degree of SA can reach 0.45. The esterified starch FTIR analysis proves that acetyl groups are introduced successfully. Starch microstructures of SEM show that the esterified starch has a loose and porous structure. DSC analysis shows that the melting temperature of starch decreases with the increase of substitution degree, which made film formation possible.

Keywords: Characterization, Conditions optimization, Esterified starch, substitution degree.

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Article Details

VOLUME: 8
ISSUE: 2
Year: 2015
Published on: 16 June, 2016
Page: [103 - 111]
Pages: 9
DOI: 10.2174/2405520408666160510102417
Price: $65

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