Effects of Drying Temperature and Particle Size on Hydration Properties of Dietary Fiber Powder from Lime and Cabbage By-Products

Abstract

The use of by-products from fruit and vegetable processing plants as sources of dietary fiber and bioactive agents is currently of interest, both from the waste management and from the production of value-added products points of view. This work aimed at studying the use of lime residues and outer leaves of white cabbage to produce dietary fiber powder, which included the study of the product pretreatment and preparation, drying, and grinding dried residues into powder. Dietary fiber content during each processing step was determined to calculate the loss of functionality of the products through the process. Hydration properties, i.e., water holding capacity (WHC) and swelling capacity (SWC), of the two residues were also determined after hot air drying at 60–80°C. The effect of particle size of dietary fiber powder, which was obtained by grinding dried residues, in the range of 63–450 μm, on the hydration properties was also evaluated and discussed.

Keywords:

• Dietary fiber powder
• Drying
• Swelling capacity
• Water holding capacity
• Particle size
• Quality

ACKNOWLEDGMENTS

The authors express their sincere appreciation to the National Center for Genetic Engineering and Biotechnology, Thailand (BIOTEC) for the financial support. The authors also wish to thank Thai Q.P. Co., Ltd. for kindly providing the vegetable residue samples for use in the study.