PubMed · 2921684
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R L Chatburn. 1989. Physiologic and methodologic issues regarding humidity therapy.. https://doi.org/10.1016/s0022-3476(89)80560-8
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Triplet-excited carbonyl species can be generated by photoexcitation of carbonyl compounds or alternatively by thermal decomposition of 1,2-dioxetanes. Such electronically excited species are involved in the oxidative modification of biologically important molecules such as DNA. This study demonstrates that thermal decomposition of 3-hydroxymethyl-3,4,4-trimethyl-1,2-dioxetane (HTMD), which is a chemical source of triplet-excited ketones, is accompanied by infrared photoemission at 1270 nm characteristic for singlet oxygen monomol emission. The intensity of infrared photoemission at 1270 nm was solvent-dependent, in agreement with the reported lifetime of singlet oxygen in the employed solvents. Calibration of monomol emission with the endoperoxide of 1,4-dimethylnaphthalene (DMNO2) showed that HTMD (30 mM) produced 25 microMs of singlet oxygen. Thus, the yield of singlet oxygen production in the thermal decomposition of HTMD in carbon tetrachloride is about 0.1%.
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A modified synthesis of [18F]fluoromisonidazole is reported which makes use of microwave heating to reduce the synthesis time to ca 70 min from EOB. A remote system for column purification, concentration and delivery to an HPLC syringe, which reduces the total absorbed dose to the operator, is also described.