45D-30 |
Antioxidant and antimicrobial activities in the catechins impregnated PVA-starch film |
S. CHEN, J. G. Wu, and B. Y. CHUO. Department of Food Science, Fu Jen Catholic University, Taiepi, 24205, Taiwan This study was aimed to explore the functions of catechins embedding into the biodegradable film, polyvinyl alcohol (PVA)-starch film, in order to provide dual-functional and environment friendly packaging material. Catechins extracted from green tea were identified and quantified by HPLC, the HPLC condition was developed as using a C18 reversed phase (250 x 4.6 mm, 5£gm) column, and a methanol/water/acetic acid (20/75/5, v/v) mobile phase at the flow rate of 1.02 ml/min. Extracted catechins were directly applied to PVA-starch films, subsequently, antioxidant and antimicrobial functions were determined using TBARS and cell count methods. Tensile strength and elongation were found to decrease as the amount of embedded chemical increased. In the model study, embedded catechins at 167 ppm had an effect on inhibiting the growth of air-borne and E. Coli. An antioxidant capability was obtained when 500 ppm was added in film. Therefore, embedded catechins at 500 ppm PVA-starch film was used to bakery products. The results showed that 500 ppm was efficient in both antioxidant and antimicrobial capability on sachima and pineapple su. Embedded catechins at 167 ppm only functioned as both antioxidant and antimicrobial agent in sachima, but no significant effect was obtained in pineapple su. The results suggest that catechins extracted from green tea may be beneficial to antioxidant and antimicrobial dual-function for packaging material.
Session 45D, Food Packaging: General
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