Biodegradability of Chemically Modified Starch (RS4)/PVA Blend Films: Part 2 |
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Authors: | Yeon-Hum Yun Young-Jung Wee Hun-Soo Byun Soon-Do Yoon |
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Institution: | 1. Department of Geosystem Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Kwangju, 500-757, South Korea 2. School of Biological Sciences and Technology, Chonnam National University, 300 Yongbong-dong, Buk-gu, Kwangju, 500-757, South Korea 3. Department of Chemical System Engineering, Chonnam National University, Yeosu, San 96-1 Doondeok-dong, Yeosu, Jeonnam, 500-749, South Korea 4. Department of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Kwangju, 500-757, South Korea
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Abstract: | Biodegradable films were successfully prepared by using cornstarch (CS), chemically modified starch (RS4), polyvinyl alcohol
(PVA), glycerol (GL), and citric acid (CA). The physical properties and biodegradability of the films using CS, RS4, and additives
were investigated. The results of the investigation revealed that the RS4-added film was better than the CS-added film in
tensile strength (TS), elongation at break (%E), swelling behavior (SB) and solubility (S). Especially, the RS4/PVA blend film with CA as an additive showed physical properties superior to other films. Furthermore,
when the film was dried at low temperature, the properties of the films clearly improved because the hydrogen bonding was
activated at low temperature. The biodegradation of films was carried out using the enzymatic, microbiological and soil burial
test. The enzyme used in this study was amyloglucosidase (AMG), α-amylase (α-AM) and β-amylase (β-AM). At the enzymatic degradation
test, the GL-added films had an approximately 60% degradation, while the CA-added films were degraded about 25%. The low degradation
value on CA-added film is attributed to low pH of film added CA that deactivated the enzymatic reaction. The microbiological
degradation teat was performed by using Bacillus subtilis and Aspergillus niger. |
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Keywords: | Chemically modified starch (RS4) Physical properties Biodegradability |
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