Starch-based edible protective coating obtained from sweet potato waste.

DOI:10.34047/MMR.2020.10102

Abstract

There is a need for sustainable solutions to increase shelf time and ensure food safety. The use of edible protective coatings in the food industry is and simple and innovative alternative, even more, when the coating is combined with active agents that confer additional functional attributes. Natural polymers such as polysaccharides are very interesting given their edibility, biodegradability, and easy access, among other aspects. Starch is one of the most widely used polysaccharides mainly due to its low cost and simplicity of processing technologies. In this work, sweet potato wastes were used to extract starch. This biopolymer was combined to develop an edible film, by gelation process. The edible coating was characterized in terms of surface morphology (SEM), chemical composition (FTIR) and wettability. For the protective effect, different fruits (bananas, apples, passion fruit, tomato and guava) were coated with 1 or 2 layers of this film. The results showed, in general, that the coated samples revealed better results regarding, texture, color, odor and delayed maturation when compared to the uncoated controls. This is indicative of the potential for increased shelf-time of fruits without significant alterations to their intrinsic properties. Moreover, the extraction process, based on food waste recovery and circularity combined with the protective effect shows the importance of this work and its alignment with several sustainable development goa