Phosphorus Research Bulletin

Editorial Board

2014 年 29 巻 p. i-
発行日: 2014年
公開日: 2014/08/19

DOIhttps://doi.org/10.3363/prb.29.i

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PHOSPHONYLATION OF INOSINE WITH SODIUM DIPHOSPHONATE IN AQUEOUS SOLUTION

Hideko Maeda, Yukina Atarashi, Chikako Nakayama, Hiromi Nishida, Hiroy ...

2014 年 29 巻 p. 1-5
発行日: 2014年
公開日: 2014/08/19

DOIhttps://doi.org/10.3363/prb.29.1

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Phosphonylation of inosine (Ino) has been achieved using inorganic diphosphonate (DP) in aqueous solution. The optimum condition for the phosphonylation of Ino with DP is Ino : DP = 1 : 10, pH 11 and 10 °C. 2´-Phosphonylinosine and 3´-phosphonylinosine were synthesized with the total yield of more than 95 %. The phosphonylated products of Ino were stable at 10 °C and pH 9. The reaction mechanism of Ino with DP was discussed.

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MECHANICAL TREATMENT ON POWDER PROPERTIES OF TITANIUM PHOSPHATE WHITE PIGMENTS

Hiroaki Onoda, Syohei Fujikado

2014 年 29 巻 p. 6-10
発行日: 2014年
公開日: 2014/12/14

DOIhttps://doi.org/10.3363/prb.29.6

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Titanium dioxide that has the photocatalytic activity is used as white pigment for cosmetics. A certain degree of sebum on the skin is decomposed by the ultraviolet irradiation in sunlight. Recently, as a white pigment, titanium phosphates were prepared from titanium sulfate and phosphoric acid. These titanium phosphates indicated large particles in size for cosmetics. Therefore in this work, the phosphates were treated with ball-mill to obtain small particles. Samples milled for 24 and 72 hours with water had smaller particles than un-milled sample. These titanium phosphates had less photocatalytic activity, therefore, these materials are expected not to decompose the sebum on the skin.

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ADSORBABILITY AND PHOTO-FENTON REACTIVITY OF AQUATIC HUMIC SUBSTANCES WITH Fe(III)-TREATED HYDROXYAPATITES IN WATER

Takeshi Moriguchi, Souhei Nakagawa

2014 年 29 巻 p. 11-20
発行日: 2014年
公開日: 2014/12/27

DOIhttps://doi.org/10.3363/prb.29.11

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Fe(III)-treated hydroxyapatite, HAP-300-Fe or HAP-400-Fe, which was prepared by treatment of almost stoichiometric hydroxyapatite HAP-300 or Ca-deficient hydroxyapatite HAP-400 with Fe(III) aqueous solution, was investigated in adsorption of aquatic humic substances, Nordic aquatic humic acid (NHA), Nordic aquatic fulvic acid (NFA), and Suwannee river fulvic acid (SFA), at 25°C for 6 h. HAP-400-Fe indicated higher adsorbability than HAP-300-Fe or the raw hydroxyapatite HAP-400. Further, HAP-400-Fe was investigated as a heterogeneous catalyst in photo-Fenton reaction of NHA, NFA, and SFA at 25°C for 20 h in water. Although all the humic substances were subjected to oxidation or decolorization by catalysis of HAP-400-Fe, the humic substance molecules adsorbed on HAP-400-Fe were slightly degraded and mineralized. This is possibly due to steric hindrance of catalysis by those large adsorbed molecules themselves and/or due to a property to scavenge hydroxyl radicals by Ar-OH groups of those molecules.

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CONTROL OF BETA-TRICALCIUM PHOSPHATE BIOMATERIAL PROPERTIES BY METAL-ION-SUBSTITUTION

Kazuaki Hashimoto, Naoyuki Matsumoto, Hirobumi Shibata

2014 年 29 巻 p. 21-30
発行日: 2014年
公開日: 2015/03/12

DOIhttps://doi.org/10.3363/prb.29.21

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β-tricalcium phosphate (β-TCP) has a fast rate of bioabsorption, and has been used clinically as bioabsorbant ceramics that is absorbed in vivo and gradually replaced by newly formed bone. Here, we focus on various metal ions with regards to their solid solution substitution in β-TCP, and explain the effects of ion substitution in β-TCP on properties such as structural stability and solubility from a crystal chemistry viewpoint. We also discuss the possibility of metal-ion-subsituted β-TCP materials as hard tissue replacements.

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PREPARATION OF PHOTOCATALYTIC THIN FILMS OF TRICALCIUM PHOSPHATE BY DOPING TITANIUM(IV) ION

Naoya Yoshida, Yuji Nakamura, Toshinori Okura

2014 年 29 巻 p. 31-35
発行日: 2014年
公開日: 2015/04/04

DOIhttps://doi.org/10.3363/prb.29.31

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Abstract : Thin films of tricalcium phosphate (TCP) with doping Ti(IV) ion were prepared. These prepared films were characterized by XRD, UV-vis transmission, FT-IT (RAS), and wettability. These characterization indicated that phase separation such as TiO₂ did not occur and that substitution with Ti(IV) occurred at Ca site. Photocatalytic activity was evaluated by methylene blue decomposition, and the results suggested that the activity was enhanced by doping Ti(IV).

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