Providing fresh vegetables and fruit to the consumers and maintaining their shelf life are among the most important post-harvest measurements. In the present research, the effect of three types of packaging films, atmosphere modified by 5% O2 + 10 CO2 + 85% N2, chitosan coating, and two temperature levels of 25 and 4℃ on the shelf life of okra during 12 days of storage is evaluated. Afterward, the effect of these treatments on the weight loss percentage, the mechanical properties (breaking force (Fbrek), penetration force (Fmax), elasticity modulus (Emod)), color indices of L*a*b*, color difference (ΔE), and gas variations gas inside the packages is investigated using completely randomized design with three replicates. The results of variance analysis showed that the effect of gas composition, packaging film, coating, and temperature on some measured factors were statistically significant at 1% or 5% probability levels. Samples stored in silicon nano-emulsion films at 4℃ due to the slowdown metabolic activities and chitosan coating due to controlling the respiration rate showed the best quality during storage time. Tissue firmness decreased during the shelf life, but these changes were less in nano-emulsion film samples than in the other two films. The variation of b* component and color difference was less in nano-emulsion film samples. Finally, the results indicated that the use of modified atmosphere technology, chitosan coating, and packaging films were effective in maintaining the quality of okra and increasing its storage period
