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Effects of α‐amylase and glycerol levels on the composition optimization of poly(β‐hydroxybutyrate‐ co ‐valerate)/starch blended biodegradable resin analyzed with response surface methodology
Author(s) -
Cheng WenYen,
Peng Jinchyau,
Lui WaiBun
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33326
Subject(s) - glycerol , valerate , absorption of water , response surface methodology , starch , materials science , composite number , aqueous solution , amylase , composite material , hydrolysis , chemical engineering , chemistry , food science , chromatography , enzyme , organic chemistry , fermentation , engineering , butyrate
Response surface methodology was used to analyze the effects of the enzyme level ( X 2 ) and glycerol level ( X 1 ) on objective attributes [water solubility index (WSI), water absorption index (WAI), and maximum loading ( Y 3 )] of a cornstarch/poly(β‐hydroxybutyrate‐ co ‐valerate) blended composite. A rotatable central composite design was used to develop models for the objective responses. The experiments were run at barrel temperatures of 160, 160, 165, and 165°C, with a screw speed of 40 rpm and complete feeding (filling ratio = 1). Responses were most affected by changes in X 2 and to a lesser extent by X 1 . Individual contour plots of the different responses were overlaid, and regions meeting the optimal WSI of 8.73%, WAI of 3.94 g of gel/g of dry weight, and Y 3 of 304.17 N were established at an X 2 of 5.43 g and an X 1 of 120.79 mL. These predicted values for the optimal process conditions were in good agreement with the experimental data. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011