Solubilized wheat protein isolate: functional properties and potential food applications

Area of Science:

• Food Science
• Protein Chemistry
• Ingredient Functionality

Background:

• Understanding the functional properties of novel protein ingredients is crucial for food product development.
• Wheat protein isolates are gaining interest as potential alternatives to traditional proteins.

Purpose of the Study:

• To evaluate the functional properties of solubilized wheat protein isolate (SWPI).
• To compare SWPI with commercial protein ingredients like sodium caseinate (NaCAS), dried egg white (DEW), nonfat dry milk (NFDM), and soy protein isolate (SPI).
• To assess the acceptability of SWPI in various food products.

Main Methods:

• Comparative analysis of solubility, foaming capacity/stability, water holding capacity, fat absorption capacity, and emulsifying capacity/stability.
• Evaluation of SWPI's functional properties with and without CaCl(2) supplementation.
• Incorporation of SWPI into ice cream, cookies, muffins, and hamburger patties at different concentrations (5-20%).
• Consumer acceptability testing of SWPI-containing products.

Main Results:

• SWPI exhibited high solubility in the pH range of 6.5-8.5.
• SWPI demonstrated superior foaming capacity and comparable foaming stability to commercial proteins, with enhanced foaming upon CaCl(2) addition.
• Water holding capacity of SWPI surpassed NaCAS, NFDM, and DEW, while fat absorption was comparable to SPI, NaCAS, and DEW.
• Emulsifying properties of SWPI were similar to SPI.
• Food products containing less than 5% SWPI were found to be acceptable to consumers.

Conclusions:

• SWPI possesses favorable functional properties, including excellent solubility and foaming characteristics.
• SWPI can be effectively utilized as an ingredient in a variety of food applications.
• Low concentrations of SWPI (<5%) are well-accepted in food products, indicating its potential for commercial use.