Action of ultrasonic waves on polyphosphates

Braginskaya, F. I.; El'piner, I.Ye.

doi:10.1016/0032-3950(63)90020-0

Polymer Science U.S.S.R.

1963

DOI: 10.1016/0032-3950(63)90020-0

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Action of ultrasonic waves on polyphosphates

F. I. Braginskaya

I.Ye. El'piner

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1977

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“…Since then, only sonodegradations of cytosine (El'piner and Sokolovskaya, 1963;Sachan et al, 1971) and of thymine (Mead et al, 1975) have been reported. In addition, a phosphate group attached to adenosine producing a stabilizing effect for adenosine has been noted by Braginskaya et al (1972). They > air > N2 > He > N20, suggestive of free radicals mediating these reactions since N2O is an effective radical scavenger.…”

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confidence: 93%

Effects of ultrasound on nucleic acid bases

McKee¹,

Christman²,

O’Brien³

et al. 1977

Biochemistry

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To understand the effects of ultrasound in biological systems at the molecular level, sonolysis of nucleic acid bases at sonic intensities less than or equal to 5 W/cm2 was studied. These sonoreactions were followed by UV-spectral decrease and by sonoproduct analysis. The order of reactivity was found to be thymine greater than uracil greater than cytosine greater than guanine greater than adenine. The extent of sonoreactions depends on the exposure time and the rate of the intensity. Aeration was necessary for maintenance of a reasonable reaction rate. "Threshold" intensities for uracil and thymine were observed at approximately 0.5 W/cm2. The effectiveness of the dissolved gases in producing sonoreactions was Ar greater than 02 greater than air greater than N2 greater than He greater than N2O, suggestive of free radicals mediating these reactions since N2O is an effective radical scavenger. Studies of the effects of substituents have shown that electronic rather than steric effects may have a greater influence. Preliminary identification indicates that cis- and trans-uracil glycols are the major products of uracil. Thus, a stepwise mechanism of pyrimidine sonolysis is proposed. Sonolysis of a dilute aqueous solution of uracil yielded pseudo-first-order kinetics in terms of [Ura] with a rate constant of 3.9 X 10(-2) min-1, implying that the rate-limiting step is the reaction of HO- with the base.

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mentioning

confidence: 93%

Effects of ultrasound on nucleic acid bases

McKee¹,

Christman²,

O’Brien³

et al. 1977

Biochemistry

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Action of ultrasonic waves on polyphosphates

Cited by 1 publication

References 3 publications

Effects of ultrasound on nucleic acid bases

Effects of ultrasound on nucleic acid bases

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