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Bài viết tiến hành xác định khả năng kháng vi khuẩn của tinh dầu vỏ quả cam, tinh dầu vỏ quả cam và hỗn hợp hai loại tinh dầu này trên nhóm vi khuẩn gram âm Escherichia coli và gram dương Staphylococcus aureus. | 077-080 1 2 1 2 -3- -12-2016 T TDA TDB trên hai và Gram Staphylococcus aureus. Escherichia vòng tròn là 39 2 8 mm tin 1 5 Staphylococcus aureus vòng tròn 43 3 5 . Escherichia coli 6 25 Staphylococcus aureus 3 35 l ml. 0 1- 0 2 và 0 8-1 6 5 Staphylococcus aureus và Escherichia coli. 45 56 0 25 . T Abstract The aim of this study was to evaluate the antimicrobial activity of oils against food-related bacteria gram negtive Escherichia coli and gram positive Staphylococcus aureus by using lime orange peel oils in individual and in mixture. Both tested oils showed effective inhibition against Escherichia coli with inhibition zones of 39 2.8 mm lime peel oil and of 32 1.5 mm orange peel oil . They also inhibited Staphylococcus aureus with inhibition zones of 43 3.5 mm lime peel oil and of 37 1.4 mm orange peel oil . The minimum inhibitory concentrations MIC of lime peel oil against both tested strains were 6.25 l ml orange peel oil on a strains of Escherichia coli 6.25 l ml and Staphylococcus aureus 3.35 l ml. With volume of lime peel oil used 0.1- 0.2 and orange peel oil 0.8-1.6 for maximum resonance f Staphylococcus aureus and of Escherichia coli. The antioxidant activity was determined by using DPPH and it was 45.56 0.25 . Keywords Biological activity Mixtures Lime peel oil Orange peel oil. Staphylococcus aureus Escherichia coli Salmonella typhy Bacillus cereus . Escherichia coli Staphylococcus aureus 077-080 Citrus limonia Citrus sinensis L TDA TDA TDA Staphylococcus aureus Escherichia coli TDA TDB 2.2. 2.2.1. o 2.2.2. o b o o b 6 3.1. Kh n c a tinh d u v qu o chanh và cam 077-080 Escherichia coli Staphylococcus aureus Escherichia coli Staphylococcus aureus Escherichia coli Staphylococcus aureus Staphylococcus aureus. Tinh N c ch t i 1MICTDB 1 2MICTDB 1 4MICTDB 1 8MICTDB d u mm thi u MIC l ml 6 25 3 13 l ml 1 6 l ml 0 8 l ml Staphylococcus Escherichia Staphylococcus l ml Escherichia coli aureus coli aureus 1MICTDA 2 51 1 54 1 34 1 16 0 8 l ml 1 2MICTDA 1 64 1 15 0 83
