Does the Encapsulation of Chlorogenic Acids from Ilex paraguariensis Co-Product by Spray-Drying Increase Their Stability?

Abstract

The Ilex paraguariensis, known as yerba-mate, is widely consumed as a hot or cold infusion in South America. Every year during the leaves harvesting, a rate of 5 tons/ha of branches is generated due to the tree trimming. The epidermis of these branches (IPC) is characterized by a high concentration of chlorogenic acids. Due to its promising high compound concentration, IPC extract is well-suited for various applications, and its preservation is particularly crucial, especially in bakery goods. This study aimed to optimize the spray-drying encapsulation of IPC extract to enhance the stability of chlorogenic acids for baked product applications. Through multivariate design, the optimal encapsulation conditions were determined, resulting in 75% encapsulation efficiency (%EE), 66.5% loading capacity (%LC), a 41 ºC increase in thermal stability, and particles with an average diameter of up to 5 µm. In sponge cakes formulated with encapsulated IPC extract (IPCE), an average of 94.4% of chlorogenic acids was preserved, compared to only 69.3% when free-IPC extract was used. Furthermore, the chlorogenic acids in IPCE exhibited excellent stability over 12 months when stored at 4ºC. Spray-drying encapsulation proved to be a rapid and effective process for the food industry, preserving chlorogenic acids for at least one year during storage under conditions that would naturally lead to degradation. These findings encourage the application of encapsulates to enhance the functionality of foods and add value to a naturally neglected commercial product.