Application of Pullulan and Chitosan Multilayer Coatings in Fresh Papayas

Abstract

In this work, some multilayer coatings (two-layer, four-layer or six-layer) based on pullulan and chitosan for protecting papayas were prepared by the layer-by-layer technique. The papayas were coated by immersion and stored at 25 °C, 50% relative humidity or up to 14 days. Uncoated and monolayer-coated papayas were used as controls. The pullulan/chitosan coatings decreased the papaya weight loss, softening, color change (b*, ΔE), and pH, retarded the fall of titratable acidity and vitamin C, and maintained respiratory rate and soluble solid contents. Sensory quality evaluation demonstrated that pullulan/chitosan coatings effectively preserved papaya flavor and overall acceptance. In general, the four-layer coatings provided the best fruit preservation. In conclusion, multilayer pullulan/chitosan coatings are efficient in maintaining the post-harvest quality and prolonging the shelf life of fresh papaya.

The use of pullulan coatings with propolis extract to extend the shelf life of blueberry (Vaccinium corymbosum) fruit

“…Chitosan‐pullulan coatings limited reduced papaya mass loss and colour and also maintained TSS content. Pullulan coatings with lemon juice limited reduced the weight loss of bananas (Zhang et al ., 2019; Ganduri, 2020).…”

Multifunctional Role of Chitosan Edible Coatings on Antioxidant Systems in Fruit Crops: A Review

“…CS-based multilayer coatings are valid tools to prolong the shelf life in whole and ready-to-eat fruits, and they take advantages of each single-layer coating with complete structure and stable performance [ 16 , 20 ] ( Figure 1 ). In particular, multilayer coatings have become of interest in fresh-cut samples that show hydrophilic properties on the cut surfaces and not allowing a good coating adhesion with a single dipping [ 9 ].…”

“…Layer-by-layer ECs obtained by a combination of CS and mucilages or CS and carboxymethyl cellulose gave the best performance, slowing down the AA losses in fresh-cut pineapple and lemon, respectively [ 24 , 86 ]. Zhang et al [ 20 ] tested CS-based multilayer coatings, comprising pullulan/CS in order to preserve the postharvest quality of papaya. This fruit with four-layers of coating exhibited the highest AA content at the end of storage.…”

Polysaccharide-Based Active Coatings Incorporated with Bioactive Compounds for Reducing Postharvest Losses of Fresh Fruits

“…Multilayer coating adhesion exhibits electrostatic interaction of the charged polyelectrolytes with that of the fruit surface [75,76]. The electrostatic interactions between the multilayer coatings of nano size dimensions may form chemical bonds, thereby providing effective control of physiological, mechanical, and functional properties on coated fruit [77]. In the multilayer coating method, coating materials containing oppositely charged polyelectrolytes are deposited through alternate dipping of the fruit in different coating solutions (Figure 1e).…”