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Optimization of an alcoholic‐alkaline freeze‐drying treatment for granular cold‐water swelling starches
Author(s) -
Zhu Bo,
Wu Shuangyan,
Liu Jianli,
Gao Weidong
Publication year - 2017
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201600198
Subject(s) - solubility , sodium hydroxide , swelling , chemistry , ethanol , volume (thermodynamics) , aqueous solution , chromatography , raw material , sodium , materials science , composite material , organic chemistry , physics , quantum mechanics
Using native maize starches as raw materials, this paper studied the process optimization of alcoholic‐alkaline freeze‐drying treatment to prepare granular cold‐water swelling (GCWS) starches. In this work, three statistical approaches, specifically, Plackett–Burman, steepest ascent path analysis and Box–Behnken design, were combined to investigate the effects of major treatment process variables, including the ethanol concentration, sodium hydroxide dosage, alcoholic‐alkaline treatment reaction time, and drying operation, that is, the vacuum degree, drying time, and material thickness, on cold‐water solubility. The results revealed that the ethanol volume fraction, sodium hydroxide dosage, and vacuum degree were significant factors. Maximum cold‐water solubility was obtained when the optimum volume fraction of ethanol and sodium hydroxide dosage were 43.32% and 58.43 mL, respectively, and when dried at 56.42 Pa of vacuum degree. The theoretical values (89.6%) and observed values (85.3%) were in reasonable agreement, and the deviation was less than 1%. The verification and repeated trial results indicated that the alcoholic‐alkaline freeze‐drying treatment could be successfully used for preparation of GCWS starches at room temperature and greatly improved cold‐water solubility.