A review on enzymatic acylation as a promising opportunity to stabilizing anthocyanins

Abstract

Anthocyanins are naturally occurring bioactive compounds found mainly in fruits, vegetables, and grains. They are usually extracted due to their biological properties and great potential for technological applications. These compounds have characteristic pH-dependent colorations that are natural dyes since they come in different colors. However, they are susceptible to processing conditions, remarkably light, temperature, and oxygen. The acylated anthocyanins showed better stability characteristics, and therefore, an acylation process of these compounds could improve their applications. The enzymatic acylation was effective and showed promising results. The current review provides an overview of the works that performed enzymatic acylation of anthocyanins and studies on the stability, antioxidant activity, and lipophilicity. In general, enzymatically acylated anthocyanins showed better stability to light and temperature than non-acylated compounds. In addition, they were liposoluble, a characteristic that allows their addition to products with lipid matrices. The results showed that these compounds formed by enzymatic acylation have perspectives of application mainly as natural colorants in food products. Therefore, the enzymatic acylation of anthocyanins appears viable to increase the industrial applicability of anthocyanins. There are still some gaps to be filled in process optimization, the reuse of enzymes, and toxicity analysis of the acylated compounds formed.

Keywords:

• Natural colorants
• lipase
• thermostability
• photostability
• antioxidant activity
• lipophilicity

Disclosure statement

The authors declare that there are no conflicts of interest.

Additional information

Funding

The authors are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), CAPES-PRINT (Project numbers 88887.310560/2018-00 and 88887.310727/2018-00).