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Структура и свойства L-лизина монохлорида и L-глицина в жидкой фазе при воздействии оптическим излучением низкой интенсивности

Структура и свойства L-лизина монохлорида и L-глицина в жидкой фазе при воздействии оптическим излучением низкой интенсивности

Abstract

Методами адсорбционной спектроскопии в УФ-видимой области, спектрофлуориметрии и оптической микроскопии исследовали спектральные и оптические характеристики L-лизина монохлорида и L-глицина в водном растворе в условиях воздействия оптическим излучением низкой интенсивности. Показано, что эти аминокислоты (АК) при концентрации (0.3-0.5 М) проявляют необычные спектральные и оптические свойства. В спектрах поглощения присутствует разный по амплитуде пик возле 270 нм, который пропорционально увеличивается с ростом концентрации, а в случае глицина при «старении» или после повторного облучения раствора. Обе аминокислоты флуоресцируют в области 300-500 нм при разных длинах волн возбуждения. В спектрах флуоресценции L-лизина HCl и L-глицина наблюдается множество полос, что указывает на образование множественных состояний и/или структур в водной среде в данных экспериментальных условиях. В другой серии экспериментов обнаружено формирование спекл-картины и появление твердых (аморфных и кристаллических) форм в ненасыщенном и оптически однородном растворе каждого образца при использовании лазерного излучения на длине волны 532 или 633 нм. Наши исследования показали, что низко интенсивный свет способен влиять на характер межмолекулярных взаимодействий АК и вызывать серьезные изменения в структуре и донорно-акцепторных свойствах биологических макромолекул.

The spectral features of L-lysine monohydrochloride and L-glycine in aqueous solution exposed to a low-intense optical radiation were studied by UV-VIS-spectroscopy and optical microscopy. It was shown that these amino acids at concentration 0.3-0.5M demonstrated unusual spectral and optical features under a low-intense optical radiation. Different in amplitude absorption peak was observed around 270 nm, which was proportionally increased with the increasing of concentration and as in the case of glycine with the “aging” or after repeated illumination of aqueous solution. Both amino acid species showed fluorescence emission in the spectral region 300-500 nm under different excitation wavelength. The spectra of liquid L-lysine HCl and L-glycine had multiple excitation and emission peaks, which indicate on the formation of multiple states and /or multiple species in aqueous medium under given experimental conditions. In another series of experiments we observed of a speckle pattern formation as well as development of aggregation or nucleation inside the transparent amino acids solutions using a cwlow-intense laser light at 532 nm or 633 nm. Our studies showed that a small intensity of light may induce a serious perturbation in structure and behavior of biological molecules at local level.

Keywords

ФАЗОВЫЕ ПЕРЕХОДЫ, НЕЛИНЕЙНЫЙ ЭФФЕКТ, ВОДА, L – ГЛИЦИН, L-ЛИЗИН МОНОГИДРОХЛОРИД, ФЛУОРЕСЦЕНЦИЯ, УФ ВИДИМАЯ СПЕКТРОФОТОМЕТРИЯ, UV/VIS SPECTROSCOPY

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold