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Efficacy of aerosolized chlorine dioxide in reducing pathogenic bacteria on washed carrots
조종락,김총경,박지용,김정목 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.4
This study aimed to evaluate the effectiveness of aerosolized chlorine dioxide (ClO2) in reducing Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes on washed carrots at various time durations and conditions. Populations of the bacteria on carrotswere reduced by 1.5, 1.5, and 1.3 log CFU/g, respectively, in each inoculum after exposure to 300 ppm of aerosolized ClO2 for 30 min. Populationswere further reduced by 2.4, 2.3, and 2.1 logCFU/ g, respectively, at 400 ppm, showing a positive correlation between the concentrations ofClO2 andmicrobial control. The D-value was 13, 14, and 15 min for E. coli O157:H7, S. Typhimurium, and L. monocytogenes, respectively. ClO2 residues were 1 ppm or less in all treated carrots, showing no appearance or discoloration defects. As a result, effectiveness of aerosolized ClO2 in reducing bacterial pathogens and maintaining the quality of fresh carrots is signifying the prospects of aqueous ClO2 as a non-thermal disinfectant.
삼채(Allium hookeri) 뿌리 추출물의 항산화 및 항염증 특성
장성매,통타오,김총경,류야쥐안,서혁준,김보섭,강성국 한국식품저장유통학회 2015 한국식품저장유통학회지 Vol.22 No.6
In this study, antioxidant and anti-inflammatory activities of water, methanol, and ethanol extracts obtained from Allium hookeri root were evaluated. The ethanol extract of A. hookeri was found to possess the strongest reducing power and also exhibited dominant effects on scavenging of nitrites, DPPH radicals, and superoxide radicals. The water extract showed more efficient DPPH and hydroxyl radical-scavenging activities than those of the methanol extract. Furthermore, the inhibitory activity against nitric oxide (NO) production in RAW 264.7 macrophages was evaluated to elucidate the anti-inflammatory properties of the extracts. Results indicated that all the extracts of A. hookeri exerted inhibitory activities against NO production, especially the ethanol extract (IC5029.13μg/mL). Total phenolic and total flavonoid contents were found to be abundant in the ethanol extract, with values of 24.96 mg gallic acid equivalent/g extract and 4.27 mg rutin equivalent/g extract, respectively. Total thiosulfinate content was determined for the first time and a high amount was present in the ethanol extract (14.2 μM/g extract). These results suggest that A. hookeri root has antioxidant and anti-inflammatory properties and could be used as a natural source for the development of pharmaceutical agents or functional foods.