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Method for preparing [F-18-]fluoride ion
| Details |
Inventors: Ino, Sento; Tamura, Masahiko; Itoh, Osamu;
Assignee: Nihon Medi-Physics Co., Ltd. (Hyogo-ken, JP)
Primary Examiner: Nguyen; NgocYen
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
The present invention provides a method for preparing [F-18]-fluoride ion which comprises the step of bringing [O-18]-enriched water containing [F-18]-fluoride ion formed by proton irradiation of [O-18]-enriched water into contact with a strongly acidic cation exchange resin to remove impurity cations, the step of then bringing the [O-18]-enriched water containing [F-18]-fluoride ion treated above into contact with a weakly basic anion exchange resin to make [F-18]-fluoride ion adsorbed to the resin and, along therewith, to recover the [O-18]-enriched water which has passed through the resin, and the step of eluting and collecting the [F-18]-fluoride ion adsorbed to the weakly basic anion exchange resin. According to the method for preparing [F-18]-fluoride ion of the present invention, [F-18]-fluoride ion can be collected at a high collection efficiency even from a larger amount (about 2 ml or more) of [O-18]-enriched water containing [F-18]-fluoride ion than the amount in prior method, and moreover expensive [O-18]-enriched water can be recovered and reused in the preparation of [F-18]-fluoride ion. |
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DETAILED DESCRIPTION OF THE INVENTION According to the present invention, there is provided a method for preparing [F-18]-fluoride ion used for producing radiofluorinated organic compounds which comprises the step of bringing [O-18]-enriched water containing [F-18]-fluoride ion formed by proton irradiation of [O-18]-enriched water into contact with a strongly acidic cation exchange resin to remove impurity cations, the step of then bringing the [O-18]-enriched water containing [F-18]-fluoride ion treated above into contact with a weakly basic anion exchange resin to make [F-18]-fluoride ion adsorbed to the resin and, along therewith, to recover the [O-18]-enriched water which has passed through the resin, and the step of eluting and collecting the [F-18]-fluoride ion adsorbed to the weakly basic anion exchange resin.
As compared with the prior method of concentrating and separating [F-18]-fluoride ion from [O-18]-enriched water containing [F-18]-fluoride ion by using a strongly basic anion exchange resin, which method shows a low collection efficiency, the method for preparing [F-18]-fluoride ion according to the present invention makes it possible to prepare [F-18]-fluoride ion at a high collection efficiency even from a larger amount (about 2 ml or more) of [O-18]-enriched water containing [F-18]-fluoride ion than previously.
In the prior method, moreover, a purification operation, such as distillation, is necessary for reusing the recovered [O-18]-enriched water for preparing [F-18]-fluoride ion.
According to the present invention, on the other hand, since impurity cations are removed by the treatment with the strongly acidic cation exchange resin as the preliminary step for making [F-18]-fluoride ion adsorbed to the weakly basic anion exchange resin, the recovered [O-18]-enriched water can be reused without purification.
Therefore, according to the present invention, [O-18]-enriched water, which is very expensive, can be reused while the loss of the water is suppressed to the minimum
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