Objective:To isolate Salmonella from curry samples and to evaluate the drug sensitivity of the food-borne Salmonella and its susceptibility to specific plant extracts.Methods:Salmonella was isolated from the curry sam...Objective:To isolate Salmonella from curry samples and to evaluate the drug sensitivity of the food-borne Salmonella and its susceptibility to specific plant extracts.Methods:Salmonella was isolated from the curry samples by standard microbiological methods and was confirmed by biochemical tests.The antibiotic susceptibility test was conducted by disc diffusion method using commercially available antibiotics such as ampicillin,tetracycline,chloramphenicol,kanamycin,and penicillin.In addition,the susceptibility of the food-borne Salmonella was also evaluated against the aqueous extracts of Camelia sinensis(L.) Theaceae(tea leaves) and the Trachyspermum ammi(L.) Apiaceae(ajwain or omum seeds).Results:Out of fifty curry samples,only seven samples were identified to have Salmonella contamination.The Salmonella isolates showed a significant drug resistance pattern except for kanamycin.The plant extracts showed a considerable antibacterial activity against the isolates,indicating the presence of antimicrobial principle which can be exploited after complete pharmacological investigations.Conclusions:The present study demonstrates the occurrence of Salmonella in the curry samples,and shows significant drug resistance against most of the commercially available antibiotics,except kanamycin.Antimicrobial effect of the plant extracts against the food-bone Salmonella suggests that dietary including medicinal herbs would be one strategy to manage food borne pathogens.展开更多
目的:建立气相色谱法测定阿育魏果中麝香草酚的方法。方法采用气相色谱法对样品中麝香草酚进行定量分析,采用Agilent HP-5(30 m ×03.2 mm ,02.5μm)为色谱柱;以50℃作为初始柱温,恒温2 min ,再以10℃/min升温至230℃保...目的:建立气相色谱法测定阿育魏果中麝香草酚的方法。方法采用气相色谱法对样品中麝香草酚进行定量分析,采用Agilent HP-5(30 m ×03.2 mm ,02.5μm)为色谱柱;以50℃作为初始柱温,恒温2 min ,再以10℃/min升温至230℃保持10 min。采用FID检测器,检测器温度为250℃,载气为氮气,柱流速为1 mL/min。结果麝香草酚进样量在浓度为02.0∽20.0 mg/mL(r =09.999)范围内与其峰面积呈良好线性关系。平均回收率为1004.7%(n =6),RSD为16.0%。10批不同产地样品中麝香草酚的含量为18.84%∽33.11%,平均含量为24.44%。结论首次用GC色谱法对阿育魏果药材挥发性成分麝香草酚进行测定。GC法简便、精确,为有效制订质量标准提供科学依据。展开更多
Radical scavenging activity (RSA), antioxidant activity (AA), reducing power, total polyphenol (TP) and flavonoid contents (TFC) of oregano (Oreganum vulgare spp), ajowan (Trachyspermum ammi) and Indian borage (Plectr...Radical scavenging activity (RSA), antioxidant activity (AA), reducing power, total polyphenol (TP) and flavonoid contents (TFC) of oregano (Oreganum vulgare spp), ajowan (Trachyspermum ammi) and Indian borage (Plectranthus amboinicus) extracts were evaluated. Oregano exhibited maximum radical scavenging activity (88.2%, 82.3%) for aqueous and ethanolic extracts at 50 ppm concentration respectively, followed by ajowan (86.9%, 68.4%) and Indian borage (30.5%, 30.4%). Extracts of oregano and ajowan showed better antioxidant activity and reducing power than that of Indian borage. Aqueous extracts of oregano had highest TP (Gallic acid equivalents) and TFC (Catechin equivalents) of 27.7% and 50.6 % respectively compared to ajowan (6.7%, 24.4%) and Indian borage (4.2%, 5.5%). Synergistic studies showed that the addition of oregano extract appreciably enhanced the RSA of ajowan and Indian borage extracts even at 50 ppm concentration.展开更多
基金Supported by Research Laboratory for Biotechnology,Department of Biotechnology,AIMST University,Malaysia
文摘Objective:To isolate Salmonella from curry samples and to evaluate the drug sensitivity of the food-borne Salmonella and its susceptibility to specific plant extracts.Methods:Salmonella was isolated from the curry samples by standard microbiological methods and was confirmed by biochemical tests.The antibiotic susceptibility test was conducted by disc diffusion method using commercially available antibiotics such as ampicillin,tetracycline,chloramphenicol,kanamycin,and penicillin.In addition,the susceptibility of the food-borne Salmonella was also evaluated against the aqueous extracts of Camelia sinensis(L.) Theaceae(tea leaves) and the Trachyspermum ammi(L.) Apiaceae(ajwain or omum seeds).Results:Out of fifty curry samples,only seven samples were identified to have Salmonella contamination.The Salmonella isolates showed a significant drug resistance pattern except for kanamycin.The plant extracts showed a considerable antibacterial activity against the isolates,indicating the presence of antimicrobial principle which can be exploited after complete pharmacological investigations.Conclusions:The present study demonstrates the occurrence of Salmonella in the curry samples,and shows significant drug resistance against most of the commercially available antibiotics,except kanamycin.Antimicrobial effect of the plant extracts against the food-bone Salmonella suggests that dietary including medicinal herbs would be one strategy to manage food borne pathogens.
文摘目的:建立气相色谱法测定阿育魏果中麝香草酚的方法。方法采用气相色谱法对样品中麝香草酚进行定量分析,采用Agilent HP-5(30 m ×03.2 mm ,02.5μm)为色谱柱;以50℃作为初始柱温,恒温2 min ,再以10℃/min升温至230℃保持10 min。采用FID检测器,检测器温度为250℃,载气为氮气,柱流速为1 mL/min。结果麝香草酚进样量在浓度为02.0∽20.0 mg/mL(r =09.999)范围内与其峰面积呈良好线性关系。平均回收率为1004.7%(n =6),RSD为16.0%。10批不同产地样品中麝香草酚的含量为18.84%∽33.11%,平均含量为24.44%。结论首次用GC色谱法对阿育魏果药材挥发性成分麝香草酚进行测定。GC法简便、精确,为有效制订质量标准提供科学依据。
文摘Radical scavenging activity (RSA), antioxidant activity (AA), reducing power, total polyphenol (TP) and flavonoid contents (TFC) of oregano (Oreganum vulgare spp), ajowan (Trachyspermum ammi) and Indian borage (Plectranthus amboinicus) extracts were evaluated. Oregano exhibited maximum radical scavenging activity (88.2%, 82.3%) for aqueous and ethanolic extracts at 50 ppm concentration respectively, followed by ajowan (86.9%, 68.4%) and Indian borage (30.5%, 30.4%). Extracts of oregano and ajowan showed better antioxidant activity and reducing power than that of Indian borage. Aqueous extracts of oregano had highest TP (Gallic acid equivalents) and TFC (Catechin equivalents) of 27.7% and 50.6 % respectively compared to ajowan (6.7%, 24.4%) and Indian borage (4.2%, 5.5%). Synergistic studies showed that the addition of oregano extract appreciably enhanced the RSA of ajowan and Indian borage extracts even at 50 ppm concentration.