Soybean extracts facilitate bacterial agglutination and prevent biofilm formation on orthodontic wire.
Soybean is an essential food ingredient that contains a class of organic compounds known as isoflavones. It is also well known that several plant agglutinins interfere with bacterial adherence to smooth surfaces. However, little is known about the effects of soybean extracts or genistein (a purified isoflavone from soybean) on bacterial biofilm formation. We evaluated the effects of soybean (Glycine max) extracts, including fermented soybean and genistein, on streptococcal agglutination and attachment onto stainless steel orthodontic wire. After cultivating streptococci in biofilm medium containing soybean extracts and orthodontic wire, the viable bacteria attached to the wire were counted. Phase-contrast microscopy and scanning electron microscopy (SEM) analyses were conducted to evaluate bacterial agglutination and attachment. Our study showed that soybean extracts induce agglutination between streptococci, which results in bacterial precipitation. Conversely, viable bacterial counting and SEM image analysis of Streptococcus mutans attached to the orthodontic wire show that bacterial attachment decreases significantly when soybean extracts were added. However, there was no significant change in pre-attached S. mutans biofilm in response to soybean. A possible explanation for these results is that increased agglutination of planktonic streptococci by soybean extracts results in inhibition of bacterial attachment onto the orthodontic wire.
1 Department of Oral Microbiology, School of Dentistry, Kyungpook National University , Daegu, Korea.
Heon-Jin
HJ
Lee
Tae-Yub
TY
Kwon
Kyo-Han
KH
Kim
Su-Hyung
SH
Hong
D001422:Bacterial Adhesion / Q000187:drug effects*; D018441:Biofilms / Q000187:drug effects*; D009969:Orthodontic Wires / Q000382:microbiology*; D010936:Plant Extracts / Q000494:pharmacology*; D013025:Glycine max / Q000737:chemistry*; D013295:Streptococcus mutans / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*
D010936:Plant Extracts