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Effect of mango kernel starch coatings on the shelf life of almond ( Prunus dulcis ) kernels
Author(s) -
Nawab Anjum,
Alam Feroz,
Haq Muhammad Abdul,
Lutfi Zubala,
Hasnain Abid
Publication year - 2018
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.13449
Subject(s) - food science , prunus dulcis , chemistry , starch , peroxide value , shelf life , ingredient , lipid oxidation , flavor , tbars , mangifera , botany , antioxidant , organic chemistry , lipid peroxidation , biology , cultivar
The effect of mango kernel starch (MKS) coatings on shelf life of roasted almonds was determined. The coating formulations were prepared by gelatinizing 4% MKS in distilled water and plasticized with glycerol, sorbitol, and their 1:1 mixture (50% of starch weight; db). Lipid oxidation was evaluated by peroxide value (PV), thiobarbituric acid reactive substances (TBARS), and p‐anisidine (AV) values. Results showed significant differences in coated and uncoated nuts and the rate of oxidation was significantly low in all coated samples. All coated nuts provided effective protection against oxidation compared with the control, particularly, the sorbitol coated nuts that did not show any sign of deterioration during 100 days of storage at 40 °C whereas in control rancidity appeared just after 50 days. Sensory evaluation of coated nuts also supported the chemical testing outcomes and all the coated nuts received higher scores for color, flavor, and texture than uncoated nuts. Practical applications Almonds have high commercial value and are consumed both in raw or roasted form and also added as an ingredient in many processed foods including confectionary, bakery products, ice creams, and beverages. The quality of almonds deteriorates during storage due to oxidation of its oil content that contains high proportion of oleic acids (unsaturated fatty acids) that are susceptible to oxidation. Among different renewable resources mango kernel starch is abundant but underutilized source of starch which has not been received significant attention from the researchers so far. At present, this inexpensive source of starch is usually ignored and wasted during mango processing; in spite of the fact that most of its properties are comparable to other commercial starches. Therefore, the application of edible coating based on mango kernel starch can make a significant contribution in prolonging shelf life of almonds, while developing healthy and natural foods.