Enhanced technological and permeation properties of a microencapsulated soy isoflavones extract

Functional extracts from soybean have numerous health benefits deriving from their content in isoflavones, especially daidzein and genistein, natural antioxidant and estrogen-like (ES-like) molecules. However, soybeans denaturated dried extracts possess critical properties for industrial applications such as poor water-solubility and inadequate storage stability. The present research was aimed at developing a new sodium-carboxymethylcellulose (NaCMC) matrix by spray-drying to microencapsulate soy extracts obtaining enhanced technological and permeation properties. Microparticles (NaCMC-Iso) loaded with marketed soybeans extract (Iso), enriched in daidzein and genistein (about 90% w/w), were produced. Different liquid feeds, based on H2O/EtOH/acetone co-solvent systems, and various process parameters were tested to obtain a free-flowing and manageable powder with satisfying yield. The engineered NaCMC-Iso powders showed satisfying loading efficiency, high flow properties, good stability and enhanced technological properties. Interestingly, the in vitro dissolution and permeation rates were dramatically improved suggesting a higher bioavailability after the oral administration. The made-up powder appears a newsworthy ingredient of easier manipulation for enclosing in dietary supplements and nutraceutical products.

► Microencapsulation by spray-drying technique using sodium-CMC as polymeric matrix.
► Production of functional powders containing soybeans extract enriched in isoflavones.
► Improved stability and flow properties of the engineered powders.
► Enhancement of dissolution and permeation rate of poor soluble functional ingredient.