Conservation of commercial quality and bioactive compounds of guava pieces by application of an alginate-acemannan coating

Abstract

The objective of this study was to evaluate the effect of an edible coating based on alginate and acemannan on the commercial quality and concentration of bioactive compounds of guava pieces stored in refrigeration. Pieces of guava were coated with an alginate film enriched with acemannan (A-Ac), with samples without cover used as a control. The fruit pieces with and without the A-Ac coating were stored for 12 days at 6 ± 2 °C. Analyses of colour, firmness, ethylene production, ascorbic acid, total polyphenols, antioxidant potential, and polyphenol profile were performed at 0, 3, 6, 9, and 12 days of storage. In addition, a sensory analysis was carried out after nine days of refrigeration. The coated guava pieces retained firmness at 2.8 N, while in the uncoated pieces, firmness decreased to 1.3 N. Similarly, the coated pieces showed better colour retention (ΔE<9) and lower ethylene emission during storage. Also, the content of ascorbic acid, total polyphenols, antioxidant capacity, and the concentration of individually identified polyphenols were higher in the pieces of guava coated with the A-Ac film. In addition, coated guava pieces, stored for nine days in refrigeration, showed greater sensory acceptability compared to uncoated samples. Therefore, applying the A-Ac cover could be a good alternative for conserving sensory attributes and bioactive compounds of guava pieces stored at low temperatures.

A New Biomaterial Derived from Aloe vera—Acemannan from Basic Studies to Clinical Application

“…This was because the Ca 2+ in AC increased the network stability favored by the physical interaction with ALG and promoted its gelation and formation of egg-box conformation. Moreover, in the food industry, the application of AC and ALG coatings can increase the ascorbic acid content and antioxidant potential of fruits and preserve their sensory, nutritional, and functional properties, providing new ideas for their future use in the fields of medicine and cosmetics [ 123 ]. In addition, it was found that AC was combined with CS and ALG via the use of electrospinning technology to build a multicomponent system.…”