http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sandra Castillo,Jorge Dávila-Aviña,Norma Heredia,Santos Garcia 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.2
Adherence and invasion to cells are the key processes during infection development by Campylobacter jejuni (C. jejuni). In this study, extracts from the byproducts of Citrus limon, Citrus aurantium, and Citrus medica were added to the cultures of C. jejuni, and the adherence and invasion of C. jejuni to HeLa cells and the expression of cadF and ciaB genes were analyzed. The relative expression of the genes was determined by quantitative reverse transcription PCR (qRT-PCR). The antioxidant activity was determined using spectrophotometric methods. Byproduct extracts at subinhibitory concentrations affected the adherence (reduced 2.3 to 99%) and invasion (reduced 71.3 to 99.2%) to the HeLa cells. The expression of cadF and ciaB was reduced from 66 to 99% and from 81 to 99%, respectively. The total phenolic content of the byproducts varied from 92 to 26 mg GAE/g and the total flavonoids varied from 161 to 29.29 mg QE/g. C. aurantium showed the highest percentage of radical scavenging activity (RSA, 90.1). These extracts can prove as effective alternatives for devising new strategies to control Campylobacter infections.
Cindy Joanna Caballero-Prado,Jose Angel Merino-Mascorro,Norma Heredia,Jorge Davila-Avina,Santos Garcıa 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.4
Shiga-toxin-producing Escherichia coli strainsare pathogenic for humans and cause mild to severe illnesses. In this study, the antimicrobial effect of citral,eugenol, and hexanal in combination with heat shock (HS)was evaluated in terms of the growth, biofilm formation,swarming, and expression of virulence genes of STECserotypes (O157:H7, O103, O111, and O26). Eugenol wasthe most effective compound against the growth of E. colistrains (MBC = 0.58 to 0.73 mg/mL), followed by citral(MBC = 0.86 to 1.26 mg/mL) and hexanal (MBC = 2.24to 2.52 mg/mL). Biofilm formation and swarming motilityhave great variability between STEC strains. Naturalcompounds—alone or combined with HS—inhibited biofilmformation; however, swarming motility was inducedby most treatments. The expression of the studied genesduring biofilm formation and swarming under naturalantimicrobials was affected but not in a uniform pattern. These treatments could be used to control contamination ofSTEC and inhibit biofilm formation.