Determination of the effect of dairy powders on adherence of Streptococcus sobrinus and Streptococcus salivarius to hydroxylapatite and growth of these bacteria |
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| Authors: | R.M. Halpin,D.B. Brady,E.D. O&rsquo Riordan,M. O&rsquo Sullivan |
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| Affiliation: | aSchool of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Ireland;bSchool of Biomolecular and Biomedical Science, University College Dublin, Ireland |
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| Abstract: | Dental caries is a highly prevalent disease caused by colonisation of tooth surfaces by cariogenic bacteria, such as Streptococcus sobrinus and Streptococcus salivarius. Reducing initial adherence of such bacteria to teeth may delay onset of caries. Many foods, such as milk, can inhibit microbial adherence. In this investigation, the effect of untreated (UT) and enzyme-treated (ET) dairy powders on adherence of S. sobrinus and S. salivarius to hydroxylapatite (HA), an analogue of tooth enamel, was examined. Untreated (UT) acid whey protein concentrate (AWPC) 80 inhibited streptococcal adherence to phosphate-buffered saline-coated HA (PBS-HA) and saliva-coated HA (S-HA) by >80% at ?31.25 μg mL−1. UT sweet WPC80, buttermilk powder and cream powder also significantly reduced adherence (P < 0.05). Enzyme-treatment of all dairy powders reduced their anti-adhesion activity. However, ET sweet WPC80 significantly inhibited growth of these streptococci (P < 0.05) at ?0.6 mg mL−1. Therefore, dairy powders may reduce progression of dental caries by their anti-adhesion and/or antibacterial activity. |
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| Keywords: | Abbreviations: PBS-HA, phosphate-buffered saline-coated hydroxylapatite S-HA, saliva-coated hydroxylapatite SWPC80, sweet whey protein concentrate 80 AWPC80, acid whey protein concentrate 80 SWPC35, sweet whey protein concentrate 35 WPI, whey protein isolate WP, whey powder DW, demineralised whey BMP, buttermilk powder CP, cream powder EA, egg albumin PPL, porcine pancreatic lipase |
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