Structurally Transformational Change of LPS by Irradiation of the Hard Laser

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The irradiation effects and the mechanisms of Er: YAG and Nd: YAG lasers on LPS (lipopolysaccharide) were evaluated. LPS was irradiated by Nd: YAG and Er: YAG lasers at 100mJ (1.5W). Also, the combustive experiment was performed using mild and hard flames with a gas burner. Several proteins with molecular weights of 10 to 40kDa were recognized as quantitative change on SDS-PAGE after the irradiation of Er: YAG laser.<BR>The electrophoretic pattern of LPS after the exposure to Nd: YAG laser was similar to that of the LPS burned by the hard flame. The hexosamine content, which was surmised from the value of the amino acid analysis of LPS after the irradiation by Nd: YAG laser showed a marked difference compared to that of other samples. The amino acid composition of LPS after the irradiation by Er: YAG laser was almost similar to that of the control and the mild flame.<BR>(J. Jpn. Soc. Laser Dent. 8: 16-22, 1997 Reprint requests to Dr. Yamaguchi)
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