Evaluation of inhibitory activities of two medicinal plant extracts Parkia biglobosa and Lonicera japonica against spoilage microorganisms isolated from mulberry fruit

摘要

Two medicinal plants, African Locust Bean (Parkia biglobosa) and Lonicera japonica, traditionally used in West Africa and China were investigated against four spoilage microorganisms: Bacillus subtilis, Cronobacter dublinensis, Pantoea agglomerans, and Bacillus sp., isolated from mulberry fruit. The aqueous extract of the P. biglobosa (ALB) was potent with average inhibitory zones against four spoilage microorganisms recorded as (Means ± SD) 6.5 to 19.5 mm as well as 6.5 to 15.5 mm for L. japonica (HSF) at concentrations of 400 mg/ml. The aqueous extracts of P. biglobosa (54%) inhibited decay better than L. japonica (66%). Decay situations of the medicinal plants with 1-MCP emerged higher than the control group 78%, 72%, and 68% in ALB + 1-MCP, HSF + 1-MCP, and deionized water, respectively. Therefore, two plant extracts against spoilage microorganisms isolated from mulberry fruit had good inhibitory activities, but their mixture with 1-MCP could not preserve the mulberry fruits in limited storage time.