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Effect of PP nanocomposite films containing ZnO NPs/4A Z/GTE on the psychrophilic bacteria count of Salmon during storage at 4°C. Each point represents the mean ± SD. Control sample: Polypropylene (PP), Treatment 1: PP/3% ZnO NPs/4A Z/GTE and Treatment 2: PP/6% ZnO NPs/4A Z/GTE. 4A Z: 4A zeolite; GTE: green tea extract
