Whey protein isolate-low acyl gellan gum Maillard-based conjugates with tailored technological functionality and antioxidant activity

• Published in: International dairy journal Vol. 109; p. 104783
• Main Authors: Nooshkam, Majid, Varidi, Mehdi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2020
• ISSN: 0958-6946; 1879-0143
• DOI: 10.1016/j.idairyj.2020.104783

Whey proteins are usually sensitive to ionic strength, pH change, and heat treatment, which may affect their functional properties. Maillard conjugation could be a facile approach to improve whey protein functionality. In this study, whey protein isolate (WPI; 0.6%, w/v) was conjugated to low acyl gellan gum (0.1, 0.2, and 0.3%, w/v) through the Maillard reaction at 90 °C for 90 min. The conjugate formation was confirmed by pH decrement, glycation degree (up to 9.44%), browning index, sodium dodecyl sulphate-polyacrylamide gel electrophoresis, and Fourier transform infrared spectroscopy. The surface hydrophobicity of WPI increased up to 2-fold upon conjugation, which led to a solubility decrease. However, the conjugated WPI had an improved interfacial activity, emulsifying activity (∼6%), foaming capacity (up to 63.64%), thickening ability (up to 24.67-fold), reducing power (up to 28.86-fold), and iron chelating activity (up to 3.31-fold). These findings may widen the industrial application of whey proteins.