Solvent dependence of the steady-state rate of 1O2 generation upon excitation of dissolved oxygen by cw 1267nm laser radiation in air-saturated solutions: Estimates of the absorbance and molar absorption coefficients of oxygen at the excitation wavelength

Krasnovsky, А.А.; Roumbal, Ya. V.; Иванов, А. В.; Ambartzumian, R. V.

doi:10.1016/j.cplett.2006.08.083

Cited by 39 publications

(57 citation statements)

References 21 publications

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“…In this connection, a decade ago our group started work on mimicking these effects in solutions of singlet ( 1 Δ g ) oxygen traps in organic solvents and water at normal pressure and temperature. It was shown using tetracene, 1,3-diphenylisobenzofuran (DPIBF) and uric acid as traps that under normal conditions, laser radiation of moderate power (0.03-2 W) causes oxygenation of these compounds [12][13][14][15][16][17][18][19]. The oxygenation was inhibited by singlet oxygen quenchers -β-carotene and sodium azide [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Photonics of dissolved oxygen molecules. Comparison of the rates of direct and photosensitized excitation of oxygen and reevaluation of the oxygen absorption coefficients

Krasnovsky

Kozlov

2016

Journal of Photochemistry and Photobiology A: Chemistry

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Section: Introductionmentioning

confidence: 99%

Photonics of dissolved oxygen molecules. Comparison of the rates of direct and photosensitized excitation of oxygen and reevaluation of the oxygen absorption coefficients

Krasnovsky

Kozlov

2016

Journal of Photochemistry and Photobiology A: Chemistry

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“…В ряде работ показана перспективность использова-ния высокоинтенсивного лазерного излучения вынужденного комби-национного рассеивания (ВКР) для лечения онкологических заболе-ваний [1][2][3]. В течение нескольких лет активно анализируется идея, согласно которой инфракрасный свет инициирует фотохимические реакции, напрямую возбуждая молекулы кислорода в биологических системах [4][5][6][7][8][9][10]. Тем самым происходит фотогенерация синглетного кислорода из растворенного в клетках молекулярного кислорода.…”

Section: Introductionunclassified

The Effect of Laser Radiation at 1265 Nm on Redox-Dependent Processes in Tumor-Bearing Organisms

Генинг¹,

Voronova²,

Долгова³

et al. 2015

Aph

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Исследуется влияние непрерывного лазерного излучения на длине волны 1265 нм на ре-докс-зависимые процессы в организме-опухоленосителе с привитым раком шейки матки РШМ-5. Рассматривается возможность использования указанного диапазона длин волн для фотодина-мической терапии на основе светокислородного эффекта. Вместе с тем проанализирована воз-можность развития побочных эффектов, в частности лазериндуцированного канцерогенеза, под воздействием лазерного излучения на соответствующей длине волны.Ключевые слова: ВКР-лазер, оксидативный стресс, редокс-зависимые процессы, рак шейки матки. THE EFFECT OF LASER RADIATION AT 1265 NM ON REDOX-DEPENDENT PROCESSES IN TUMOR-BEARING ORGANISMSWe study the effect provided by a quasi-continuous wave laser operating at the wavelength of 1265 nm on redox-dependent processes in tumor-bearing organism implanted with cervical cancer-5 (CC5). The laser wavelength is eligible for potential applications in photodynamic therapy based on light-oxygen effect. Also, we analyze possible side effects, in particular, laser-induced carcinogenesis.

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“…The singlet oxygen that is formed has excess energy of 94.4 kJ/mol compared with triplet oxygen [43][44][45], as a result of which it readily destroys both the dye and the polymer:…”

mentioning

confidence: 99%

“…If the energy of the T state of the dye exceeds the energy of the singlet state of oxygen, the transition from the former to the latter occurs according to the following scheme [43][44][45]:…”

mentioning

confidence: 99%

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Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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Solvent dependence of the steady-state rate of 1O2 generation upon excitation of dissolved oxygen by cw 1267nm laser radiation in air-saturated solutions: Estimates of the absorbance and molar absorption coefficients of oxygen at the excitation wavelength

Cited by 39 publications

References 21 publications

Photonics of dissolved oxygen molecules. Comparison of the rates of direct and photosensitized excitation of oxygen and reevaluation of the oxygen absorption coefficients

Photonics of dissolved oxygen molecules. Comparison of the rates of direct and photosensitized excitation of oxygen and reevaluation of the oxygen absorption coefficients

The Effect of Laser Radiation at 1265 Nm on Redox-Dependent Processes in Tumor-Bearing Organisms

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

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