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Atomic force microscopy-guided fractionation reveals the influence of cranberry phytochemicals on adhesion of Escherichia coli.

Abstract

Cranberry juice has been long used to prevent infections because of its effect on the adhesion of the bacteria to the host surface. Proanthocyanidins (PACs) comprise of one of the major classes of phytochemicals found in cranberry, which have been extensively studied and found effective in combating adhesion of pathogenic bacteria. The role of other cranberry constituents in impacting bacterial adhesion haven't been studied very well. In this study, cranberry juice fractions were prepared, characterized and tested for their effect on the surface adhesion of the pathogenic clinical bacterial strain E. coli B78 and non-pathogenic control E. coli HB101. The preparations tested included crude cranberry juice extract (CCE); three fractions containing flavonoid classes including proanthocyanidins, anthocyanins and flavonols; selected sub-fractions, and commercially available flavonol glycoside, quercetin-3-O-galactoside. Atomic force microscopy (AFM) was used to quantify the adhesion forces between the bacterial surface and the AFM probe after the treatment with the cranberry fractions. Adhesion forces of the non-pathogenic, non fimbriated lab strain HB101 are small (average force 0.19 nN) and do not change with cranberry treatments, whereas the adhesion forces of the pathogenic, Dr adhesion E. coli strain B78 (average force of 0.42 nN) show a significant decrease when treated with cranberry juice extract or fractions (average force of 0.31 nN, 0.37 nN and 0.39 nN with CCE, Fraction 7 and Fraction 4 respectively). In particular, the fractions that contained flavonols in addition to PACs were more efficient at lowering the force of adhesion (average force of 0.31 nN-0.18 nN between different sub-fractions containing flavonols and PACs). The sub-fractions containing flavonol glycosides (from juice, fruit and commercial quercetin) all resulted in reduced adhesion of the pathogenic bacteria to the model probe. This strongly suggests the anti adhesive role of other classes of cranberry compounds in conjunction with already known PACs and may have implications for development of alternative anti bacterial treatments.

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  • Authors+Show Affiliations

    ,

    Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, USAMA 01609. terric@wpi.edu.

    , ,

    Source

    Food & function 7:6 2016 Jun 15 pg 2655-66

    MeSH

    Bacterial Adhesion
    Chromatography, High Pressure Liquid
    Escherichia coli
    Flavonols
    Microscopy, Atomic Force
    Phytochemicals
    Plant Extracts
    Proanthocyanidins
    Quercetin
    Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
    Vaccinium macrocarpon

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    27220364

    Citation

    Gupta, Prachi, et al. "Atomic Force Microscopy-guided Fractionation Reveals the Influence of Cranberry Phytochemicals On Adhesion of Escherichia Coli." Food & Function, vol. 7, no. 6, 2016, pp. 2655-66.
    Gupta P, Song B, Neto C, et al. Atomic force microscopy-guided fractionation reveals the influence of cranberry phytochemicals on adhesion of Escherichia coli. Food Funct. 2016;7(6):2655-66.
    Gupta, P., Song, B., Neto, C., & Camesano, T. A. (2016). Atomic force microscopy-guided fractionation reveals the influence of cranberry phytochemicals on adhesion of Escherichia coli. Food & Function, 7(6), pp. 2655-66. doi:10.1039/c6fo00109b.
    Gupta P, et al. Atomic Force Microscopy-guided Fractionation Reveals the Influence of Cranberry Phytochemicals On Adhesion of Escherichia Coli. Food Funct. 2016 Jun 15;7(6):2655-66. PubMed PMID: 27220364.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Atomic force microscopy-guided fractionation reveals the influence of cranberry phytochemicals on adhesion of Escherichia coli. AU - Gupta,Prachi, AU - Song,Biqin, AU - Neto,Catherine, AU - Camesano,Terri A, Y1 - 2016/05/25/ PY - 2016/5/26/entrez PY - 2016/5/26/pubmed PY - 2018/3/6/medline SP - 2655 EP - 66 JF - Food & function JO - Food Funct VL - 7 IS - 6 N2 - Cranberry juice has been long used to prevent infections because of its effect on the adhesion of the bacteria to the host surface. Proanthocyanidins (PACs) comprise of one of the major classes of phytochemicals found in cranberry, which have been extensively studied and found effective in combating adhesion of pathogenic bacteria. The role of other cranberry constituents in impacting bacterial adhesion haven't been studied very well. In this study, cranberry juice fractions were prepared, characterized and tested for their effect on the surface adhesion of the pathogenic clinical bacterial strain E. coli B78 and non-pathogenic control E. coli HB101. The preparations tested included crude cranberry juice extract (CCE); three fractions containing flavonoid classes including proanthocyanidins, anthocyanins and flavonols; selected sub-fractions, and commercially available flavonol glycoside, quercetin-3-O-galactoside. Atomic force microscopy (AFM) was used to quantify the adhesion forces between the bacterial surface and the AFM probe after the treatment with the cranberry fractions. Adhesion forces of the non-pathogenic, non fimbriated lab strain HB101 are small (average force 0.19 nN) and do not change with cranberry treatments, whereas the adhesion forces of the pathogenic, Dr adhesion E. coli strain B78 (average force of 0.42 nN) show a significant decrease when treated with cranberry juice extract or fractions (average force of 0.31 nN, 0.37 nN and 0.39 nN with CCE, Fraction 7 and Fraction 4 respectively). In particular, the fractions that contained flavonols in addition to PACs were more efficient at lowering the force of adhesion (average force of 0.31 nN-0.18 nN between different sub-fractions containing flavonols and PACs). The sub-fractions containing flavonol glycosides (from juice, fruit and commercial quercetin) all resulted in reduced adhesion of the pathogenic bacteria to the model probe. This strongly suggests the anti adhesive role of other classes of cranberry compounds in conjunction with already known PACs and may have implications for development of alternative anti bacterial treatments. SN - 2042-650X UR - https://www.unboundmedicine.com/medline/citation/27220364/Atomic_force_microscopy_guided_fractionation_reveals_the_influence_of_cranberry_phytochemicals_on_adhesion_of_Escherichia_coli_ L2 - https://doi.org/10.1039/c6fo00109b DB - PRIME DP - Unbound Medicine ER -