Development of an Emulsion Gel Containing Peanut Sprout Oil as a Fat Replacer in Muffins: Physicochemical, Tomographic, and Texture Properties

Abstract

Peanut sprouts are known to increase their resveratrol content during germination, leading to cultivation in smart farms. Recently, peanut sprout oil extraction and sales have gained traction; however, processed foods utilizing peanut sprout oil have yet to be developed. In this study, water-in-oil (W/O) emulsion gels were structured with water, peanut sprout oil (PSO), sorbitan monostearate (SMS), and candelilla wax (CW) in different ratios, and their potential as shortening substitutes in muffins was evaluated on physicochemical and sensory properties. PSO comprised 67% unsaturated fatty acids and had higher phospholipid (17.97%) and resveratrol (15.95 µg/L) contents and antioxidant activity (71.52%) compared to peanut oil. The PSO emulsion gels were physically structured without changing their chemical compositions. The SMS and CW ratios were found to have a significant influence on the textural properties, solid fat content, rheology, and crystallization of the emulsion gels. The viscoelastic properties of the emulsion gels showed a higher storage modulus than loss modulus and increased with increasing gelator content. Muffins prepared with emulsion gels were characterized by a harder texture and larger pore size, while in the case of muffins mixed with a ratio of 25% SMS and 75% CW, there was no significant difference in overall preference of sensory evaluation compared to shortening muffins. Thus, these findings reveal the potential utility of PSO as a fat substitute and indicate that W/O emulsion gels are suitable for producing muffins without a loss of quality.

Keywords

• peanut sprout oil
• resveratrol
• fat substitute
• W/O emulsion gel
• emulsifier
• bakery products