Measurement of (L*) factor
The results showed that all samples have been affected by coatings (p‹0.01). The results showed that all L* factors of samples were reduced during storage. The lowest changes of L* factor were
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in 60% chitosan + 40%aloe vera coverage and the highest changes were observed in 100% coverage. Significant differences were not observed between 100% chitosan and 80% chitosan + 20%aloe vera coverage (Fig 4). This is because hydrolysis of phenolic compounds cannot be prevented by aloe Vera, thus causing darkening of the samples during storage. Higher amount of aloe vera increases the turbidity of samples (Khoshgozaran-Abras et al. 2012). Khoshnoudinia et al. (2012) found that L* factor in the purple coverage of pistachio shows a significant difference between control and covered samples, so that the formulation containing ascorbic acid showed a higher level of L* factor and the pistachio shell was lighter in colour. This colour reduction in the gelatine coating containing antioxidant propyl gallate was found.