Abstract
Abstract Polysaccharide-based coatings are an alternative to synthetic coatings for fruit conservation. In this study, we aim to evaluate the physical and chemical characteristics of breadfruit starch for coating using glycerol, sorbitol, and mannitol as plasticizers. We applied coatings composed of 7% starch and 2% plasticizers to cherry tomatoes, and evaluated the storage during 12 days at a temperature of 18 °C. The breadfruit starch had an amylose content of 27.17%, granular size of 0.85-0.87, a gelatinization temperature of 75.10 °C, characteristics of standard starch type B and low syneresis. Coatings composed of glycerol and sorbitol showed a reduction in mass loss and delayed ripening. Glycerol and sorbitol are recommended for preparing coatings based on breadfruit starch for post-harvest storage of tomatoes.
Highlights
There is a need to replace synthetic products as plastic coatings based on petrochemical materials with coatings based on natural products that are renewable or biodegradable for improving storage of plant products like fruits
This study evaluated the characteristics of starch made from breadfruit (Artocarpus altilis) and its efficiency when associated with plasticizers such as glycerol, sorbitol and mannitol as a coating for cherry tomato (Solanum lycopersicum var. cerasiforme)
The obtained starch content was 83.97%; a value similar to that found by Adebowale et al (2005) of 84.48%, indicating the efficiency of the method used for its extraction
Summary
There is a need to replace synthetic products as plastic coatings based on petrochemical materials with coatings based on natural products that are renewable or biodegradable for improving storage of plant products like fruits. The use of natural products as material for coating may decrease production costs, as well as being abundant in nature and renewable. Coatings based on polysaccharides are a versatile alternative to applications in the food industry, not just aiming to improve food conservation (Falcão-Rodrigues et al, 2007; Cazón et al, 2017; Nawab et al, 2017), and to produce an environmentally friendly product. Starch is a highly demanded product in the food industry due to its low price, abundance, and versatility. Breadfruit is a tropical fruit from Malaysia, South Pacific, and the Caribbean from the Moraceae family (Nwokocha & Williams, 2011; Turi et al, 2015) containing from 18 to 37 g/100 g of carbohydrates in its composition. The amylose and amylopectin contents vary from 16.4 to 53.7% and 72.3 to 77.5%, respectively, the granular size from 0.5 to 37.8 μm, a gelatinization temperature of 69.3 °C and crystallinity of 14.3% (Turi et al, 2015; Tan et al, 2017)
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