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자료유형
학술저널
저자정보
저널정보
한국식품영양과학회 Journal of Food Science and Nutrition Journal of Food Science and Nutrition Vol.3 No.1
발행연도
1998.3
수록면
27 - 35 (9page)

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Starch-polyethylene films containing high molecular weight(MW) oxidized-polyethylene and prooxidant were prepared, and thermal- and bio-degradability of the films were determined. Increased levels of starch resulted in a corresponding reduction in mechanical strength of the films. However, the addition of high MW oxidized-polyethylene did not significantly reduce the percent elongation of the films. The films containing high MW oxidized-polyethylene and prooxidant were degraded faster than those containing no additives during the heat treatment. The films lost their measurable mechanical properties when their weight-average MW(M_w) fell below 50,000. Biodegradability of the films was determined by a pure culture assay with either Streptomyces badius 252, S. setonii 75Vi2 or S. viridosporus T7A, and by an extracellular enzyme assay using S. setonii 75Vi2. The results from pure culture assay indicated that biomass accumulation on the film surface inhibited chemical and biological degradation of the films. The extracellular enzyme assay demonstrated decrease of percent elongation and increase of carbonyl index of the films. Therefore, extracellular enzyme assay could be used as a good method to evaluate biodegradability of the films.

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Abstract

INTRODUCTION

MATERIALS AND METHODS

RESULTS AND DISCUSSION

ACKNOWLEDGEMENTS

REFERENCES

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