title: Adsorption behavior of methacryloyloxydecyl dihydrogen phosphate on an apatite surface at neutral pH.
abstract: This study aimed to quantify the adsorption affinity of neutralized 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP-N) toward hydroxyapatite (HA) and dicalcium phosphate dihydrate (DCPD) at pH 7.0 by employing the Langmuir isotherm model. Furthermore, the effects of inorganic phosphate (Pi) and fluoride (F(-) ) ions on the adsorption of 10-MDP-N onto HA and DCPD were examined. Fixed amounts of HA and DCPD powders were suspended in different concentrations of 10-MDP-N solutions and were incubated for 18 h. Equilibrated concentrations of 10-MDP-N were measured by spectrophotometry and the adsorption affinity was estimated using the Langmuir model. Moreover, the adsorption was examined by zeta-potential analysis. The results indicated that significant Langmuir correlation was noted in both substrates, along with an increasing negative zeta-potential; however, in DCPD the correlation was less strong. The addition of 1.0 mM Pi slightly delayed the adsorption of 10-MDP-N onto both substrates, whereas 3.0 mM Pi drastically delayed adsorption onto HA but completely inhibited adsorption onto DCPD. Up to 50 ppm, F(-) enhanced the adsorption onto HA, and the adsorption plateaued at higher concentrations of F(-) , whereas no obvious influence of F(-) on the adsorption onto DCPD was noted.
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Baba
authors.initials: B
authors.lastname: Bista
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Syozi
authors.initials: S
authors.lastname: Nakashima
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Nikaido
authors.affiliation: International Exchange Center, Tokyo Medical and Dental University, Tokyo, Japan.|Department of Restorative Dentistry, University of Washington School of Dentistry, Seattle, Washington, USA.
authors.forename: Alireza
authors.initials: A
authors.lastname: Sadr
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Takagaki
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Maria J R H
authors.initials: MJ
authors.lastname: Romero
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Sato
authors.affiliation: Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000327:Adsorption; D001031:Apatites; D017886:Durapatite; D006863:Hydrogen-Ion Concentration; D008689:Methacrylates
chemical_list: D001031:Apatites; D008689:Methacrylates; C069749:methacryloyloxydecyl dihydrogen phosphate; D017886:Durapatite
keywords: chemical adsorption; dicalcium phosphate dihydrate; functional monomer; hydroxyapatite; neutralized methacryloyloxydecyl dihydrogen phosphate