Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/61367
Type: Artigo de periódico
Title: Determination of critical storage conditions of coffee oil microcapsules by coupling water sorption isotherms and glass transition temperature
Author: Frascareli, EC
Silva, VM
Tonon, RV
Hubinger, MD
Abstract: Coffee oil microcapsules were produced by spray-drying using as encapsulating agents gum Arabic, whey protein isolate (WPI) and mixtures of maltodextrin (MD) and WPI, at three different proportions (3:1, 1:1 and 1:3). Sorption isotherms were determined by the gravimetric method, and the glass transition temperature (Tg) was measured by differential scanning calorimetry. Microcapsules produced with gum Arabic showed the highest water adsorption and underwent a stronger water plasticising effect. At the highest water activity (0.843), this sample had a Tg value of -18.3 degrees C, while those produced with WPI at higher proportions showed values around 25 and 30 degrees C. The good fit of experimental data by Guggenheim-Anderson-de Boer and GordonTaylor models allowed the determination of the critical storage conditions, at which powders are not susceptible to deteriorative physical changes. The samples produced with 1:1 and 1:3 of MD/WPI were the most stable ones, showing critical water activity values of 0.890 and 0.938, respectively.
Subject: Coffee oil
critical storage conditions
glass transition
microencapsulation
water sorption
Country: EUA
Editor: Wiley-blackwell
Rights: fechado
Identifier DOI: 10.1111/j.1365-2621.2012.02939.x
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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