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Because of the higher content of unsaturated fatty acids (UNSFA) and phenolics, walnut kernels are vulnerable to oxidative rancidity and browning due to unfavorable postharvest handling procedures. This study investigates the impact of gum arabic coating enriched with γ-aminobutyric acid (GABA) on oxidative rancidity and browning of kernels during storage at 20 °C. The results showed that the walnut kernels coated with gum arabic (5 %) enriched with GABA (0.1 mM) exhibited lower oxidative rancidity and browning, manifested by lower peroxide value and malondialdehyde accumulation along with higher whiteness index. Moreover, kernels had higher UNSFA/SFA ratio as a response to lower lipoxygenase activity and H2O2 accumulation. The reduced oxidative browning in coated kernels was accompanied with lower polyphenol oxidase and higher phenylalanine ammonia-lyase activity leading to higher accumulation of phenolics and increased DPPH• scavenging capacity. Based on our findings, gum arabic coating (5 %) enriched with GABA (0.1 mM) may have a commercial potential for maintaining nutritional quality of walnut kernels.

Background: The purpose of the study was to determine the relationship between affective control and mental health with academic performance of second grade high school students. Materials and Methods: The study was applied regarding purpose, and its method was descriptive its correlation design. The population was all second-grade high school students. In this study, 170 people were selected using cluster sampling. Data collection tools were general health, affective control, and academic performance questionnaires. Results: The results indicated a significant and positive relationship between components of affective control and mental health with academic performance. Moreover, students' academic performance can be predicted through affective control and mental health, and overall about 28.2% of variance in the academic performance of students is predictable by affective control and mental health. Conclusion: By relying on the findings of this study, teachers and education officials can play a significant role in academic improvement of the students by presenting strategies for affective control and improving mental health of students.