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Journal of Food Science and Technology

, Volume 55, Issue 3, pp 891–898 | Cite as

Physical properties and estimated glycemic index of protein-enriched sorghum based chips

  • Hongrui Jiang
  • Navam S. HettiararchchyEmail author
  • Ronny Horax
Original Article

Abstract

Sorghum is a gluten-free grain and more attention has been given to the nutritional properties and recently its usage as a wheat replacement in food products. In the present work, protein-enriched sorghum based snack chips, prepared from sorghum meal with soy protein isolates and soy flour to meet the final protein content of 35.7%, were produced. The effect of varying baking powder (1.5–2.5%), dough sheet thickness (0.7–1.7 mm), and baking time (6–12 min) on the physical properties of the snack chips was investigated using a central composite design of response surface methodology. Under baking temperature of 160 °C, with baking powder added, the water activity and puffiness of chips significantly increased. Baking time was the most significant factor for all the parameters detected except for puffiness. The optimized conditions of preparing protein-enriched sorghum chips were baking powder 2.5%, dough sheet thickness 0.7 mm, and baking time 7.66 min. The estimated glycemic index (eGI) of the protein-enriched sorghum chips (eGI = 59.8) was significantly lower than soybean-free sorghum chips. The gluten-free protein-enriched sorghum chips developed could be considered as protein rich with lower intermediate-glycemic index classified healthy snacks and potential commercialization.

Keywords

Sorghum Chips Protein enrichment Physical properties Glycemic index 

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Copyright information

© Association of Food Scientists & Technologists (India) 2018

Authors and Affiliations

  • Hongrui Jiang
    • 1
  • Navam S. Hettiararchchy
    • 2
    Email author
  • Ronny Horax
    • 2
  1. 1.Institute of Light Industry and Food EngineeringGuangxi UniversityNanningChina
  2. 2.Department of Food Science and Institute of Food Science and EngineeringUniversity of ArkansasFayettevilleUSA

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