Yes, coriander powder should be vacuum packed in hot climates to prevent moisture absorption, clumping, and loss of flavor and aroma. Vacuum packing extends its shelf life and maintains its quality.
Coriander powder, like other ground spices, is highly susceptible to degradation in hot and humid climates. The heat accelerates the loss of volatile oils, which are responsible for its characteristic flavor and aroma. Humidity causes the powder to absorb moisture, leading to clumping and the growth of mold or bacteria. Vacuum packing removes air from the packaging, creating an oxygen-free environment. This significantly reduces oxidation, inhibits microbial growth, and prevents moisture from entering. By vacuum packing coriander powder, you effectively protect it from these detrimental factors, preserving its freshness, flavor, and aroma for a longer period. The lack of oxygen also slows down the degradation of the spice's color.
Even when vacuum packed, store coriander powder in a cool, dark place away from direct sunlight and heat sources like the stove. This further enhances its shelf life and prevents premature degradation.