Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/65982
Type: Artigo de periódico
Title: Evaluation of the in vitro glycemic index of a fiber-rich extruded breakfast cereal produced with organic passion fruit fiber and corn flour
Author: Leoro, MGV
Clerici, MTPS
Chang, YK
Steel, CJ
Abstract: The aim of this study was to determine the influence of process parameters and Passion Fruit Fiber (PFF) addition on the Glycemic Index (GI) of an extruded breakfast cereal. A 2(3) Central Composite Rotational Design (CCRD) was used, with the following independent variables: raw material moisture content (18-28%), 2(nd) and 3(rd) barrel zone temperatures (120-160 degrees C), and PFF (0-30%). Raw materials (organic corn flour and organic PFF) were characterized as to their proximate composition, particle size, and in vitro GI. The extrudates were characterized as to their in vitro GI. The Response Surface Methodology (RSM) and Principal Component Analysis (PCA) were used to analyze the results. Corn flour and PFF presented 8.55 and 7.63% protein, 2.61 and 0.60% fat, 0.52 and 6.17% ash, 78.77 and 78.86% carbohydrates (3 and 64% total dietary fiber), respectively. The corn flour particle size distribution was homogeneous, while PFF presented a heterogeneous particle size distribution. Corn flour and PFF presented values of GI of 48 and 45, respectively. When using RSM, no effect of the variables was observed in the GI of the extrudates (average value of 48.41), but PCA showed that the GI tended to be lower when processing at lower temperatures (< 128 degrees C) and at higher temperatures (> 158 degrees C). When compared to white bread, the extrudates showed a reduction of the GI of up to 50%, and could be considered an interesting alternative in weight and glycemia control diets.
Subject: glycemic index
breakfast cereal
passion fruit fiber
thermoplastic extrusion
Country: Brasil
Editor: Soc Brasileira Ciencia Tecnologia Alimentos
Rights: aberto
Identifier DOI: 10.1590/S0101-20612010000400019
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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