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首页> 外文期刊>Food microbiology >Enhancing the antibacterial effect of 461 and 521 nm light emitting diodes on selected foodborne pathogens in trypticase soy broth by acidic and alkaline pH conditions
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Enhancing the antibacterial effect of 461 and 521 nm light emitting diodes on selected foodborne pathogens in trypticase soy broth by acidic and alkaline pH conditions

机译：通过酸性和碱性pH条件增强461和521 nm发光二极管对胰酶解大豆肉汤中某些食源性病原体的抗菌作用

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摘要

Light emitting diodes (LEDs) with their antibacterial effect present a novel method for food preservation. This effect may be influenced by environmental conditions such as the pH of the food contaminated by the pathogen. Thus, it is necessary to investigate the influence of pH on the antibacterial effect of LEDs before their application to real food matrices. Escherichia coli O157:H7, Salmonella Typhimurium and Listeria monocytogenes in trypticase soy broth were illuminated using 10-W 461 (22.1 mW/cm~2) and 521 nm (16 mW/cm~2) LEDs at pH values of 4.5, 6.0, 7.3, 8.0 and 9.5 for 7.5 h at 15 ℃. Using the 461 nm LEDs, the populations of E. coli O157:H7 decreased by 2.1 ± 0.02, 1.2 ± 0.08 and 4.1 ± 0.42 log CFU/ml at pH 4.5, 7.3 and 9.5 respectively, after a dosage of 596.7 J/cm~2. For L. monocytogenes, approximately a 5.8 ± 0.03 log reduction was observed after 238.7 J/cm~2 at pH 4.5 using the 461 nm LEDs, while the bacterial concentration was reduced by 1.8 ± 0.01 log at pH 9.5 after 596.7 J/cm~2. Bacterial inactivation using the 521 nm LEDs showed similar trends to the 461 nm LEDs at both acidic and alkaline pH conditions but with lower (1-2 log CFU/ml) reductions after 432 J/cm~2. Lower D-values were observed for L. monocytogenes when exposed to LEDs at acidic pH values, while the sensitivity of E. coli O157:H7 and S. Typhimurium to LED was markedly increased at an alkaline pH. Regardless of the pH at which the cultures were illuminated, the percentage of sublethal injury increased with the treatment time. These results highlight the enhanced antibacterial effect of the 461 nm LED under acidic and alkaline pH conditions, proving its potential to preserve foods as well as to have synergistic effect with acidic and alkaline antimicrobials.
机译：具有抗菌作用的发光二极管（LED）提出了一种用于食品保存的新颖方法。这种影响可能会受到环境条件的影响，例如被病原体污染的食物的pH值。因此，在将LED应用于实际食品基质之前，有必要研究pH值对LED抗菌效果的影响。用10-W 461（22.1 mW / cm〜2）和521 nm（16 mW / cm〜2）LED在pH值为4.5、6.0、10-W 461的条件下照射胰蛋白酶解冻大豆肉汤中的大肠杆菌O157：H7，鼠伤寒沙门氏菌和李斯特菌。 7.3、8.0和9.5在15℃下放置7.5小时。使用461 nm LED，在596.7 J / cm〜的剂量下，在pH 4.5、7.3和9.5下，大肠杆菌O157：H7的种群分别下降了2.1±0.02、1.2±0.08和4.1±0.42 log CFU / ml。 2。对于单核细胞增生李斯特菌，使用461 nm LED在pH值为4.5的238.7 J / cm〜2后观察到约5.8±0.03 log的减少，而596.7 J / cm〜的pH 9.5在细菌浓度为pH 9.5时减少了1.8±0.01 log。 2。在酸性和碱性pH条件下，使用521 nm LED灭活细菌的趋势与461 nm LED相似，但在432 J / cm〜2后降低的幅度较小（1-2 log CFU / ml）。当在酸性pH值下暴露于LED时，单核细胞增生李斯特菌观察到较低的D值，而在碱性pH值下，大肠杆菌O157：H7和鼠伤寒沙门氏菌对LED的敏感性显着提高。不论在何种pH值下照射培养物，亚致死损伤的百分比均随治疗时间的增加而增加。这些结果突出了461 nm LED在酸性和碱性pH条件下增强的抗菌效果，证明了其在保存食品以及与酸性和碱性抗菌剂具有协同作用方面的潜力。

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  • 来源
    《Food microbiology》 |2015年第6期|49-57|共9页
  • 作者

    Vinayak Ghate; Ai Ling Leong; Amit Kumar; Woo Suk Bang; Weibiao Zhou; Hyun-Gyun Yuk;

  • 作者单位

    Food Science & Technology Programme, Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore;

    Food Science & Technology Programme, Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore;

    Food Science & Technology Programme, Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore;

    Department of Food and Nutrition, Yeungnam University, 214-1 Dae-dong, Gyeongsan-si, Gyeongsangbuk-do, 712-749, South Korea;

    Food Science & Technology Programme, Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore,National University of Singapore (Suzhou) Research Institute, No. 377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China;

    Food Science & Technology Programme, Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore,National University of Singapore (Suzhou) Research Institute, No. 377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Light emitting diode; pH; Antibacterial effect; Foodborne pathogens;

    机译：发光二极管;pH值抗菌作用;食源性病原体;

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