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To determine the optimization of aging time for improved antioxidant activity and bacteriostatic capacity of garlic during its aging, garlic produced in Yunlin region, Taiwan, was employed as the test material in an analysis of the allicin content, total phenol content, antioxidant activity, and bacteriostatic capacity of fresh and aged garlic extracts. Allicin content of the aging garlic decreased to a minor level, whereas total phenol content increased to 16.96 mg gallic acid equivalent (GAE)/mL after 35 days of the aging process. The results of antioxidant testing demonstrated favorable positive correlations among IC50 of DPPH scavenging capacity, Trolox equivalent antioxidant activity, and superoxide dismutase activity for both the fresh and aged garlic extracts. The analytical results showed that aging of garlic at 70 °C and 85% relative humidity for 40 days substantially increased the quantity of phenolics, DPPH scavenging capacity, Trolox equivalent antioxidant activity, and superoxide dismutase activity and enhanced the antioxidant activity. The extracts exhibited higher bacteriostatic capacity against Gram-positive bacteria such as Bacillus subtilis and Staphylococcus aureus than against Gram-negative bacteria such as Escherichia coli and Pseudomonas aeruginosa. In conclusion, black garlic aged under the optimum conditions exhibited favorable antioxidant activity and bacteriostatic ability.

Optimization of Aging Time for Improved Antioxidant Activity and Bacteriostatic Capacity of Fresh and Black Garlic