biophBiomedical PhotonicsBiomedical Photonics2413-9432Non-profit partnership for development of domestic photodynamic therapy and photodiagnosis10.24931/2413-9432-2020-9-3-21-29bioph-440Research ArticleОРИГИНАЛЬНЫЕ СТАТЬИORIGINAL ARTICLESEvaluation of strontium aluminate phosphorescent effect on blood as potential light source for phototherapyEvaluation of strontium aluminate phosphorescent effect on blood as potential light source for phototherapyChoongHeng JieChoongHeng Jiechoonghengjie@yahoo.comSuardiNursakinahSuardiNursakinahAhmedNaser M.AhmedNaser M.Научный университет МалайзииМалайзияUniversiti Sains MalaysiaMalaysia202018102020932129Copyright © Choong H.J., Suardi N., Ahmed N.M., 20202020Choong H.J., Suardi N., Ahmed N.M.Choong H.J., Suardi N., Ahmed N.M.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.pdt-journal.com/jour/article/view/440

Несмотря на доказанную эффективность фототерапии, у этого метода есть ограничения для эпителиального применения из-за незначительного проникновения света. Авторами предложен фосфоресцирующий порошок (алюминат стронция) в качестве потенциального источника света, излучающего фотоны изнутри тела для целей фототерапии. Порошок алюмината стронция, использованный в эксперименте, имеет самое высокое пиковое поглощение при длине волны около 650 нм и самое низкое при длине волны около 350 нм. Согласно изображениям автоэлектронной сканирующей микроскопии, порошок имеет размер частиц от 10 до 50 мкм в кубической фазе. Оценка эффективности фототерапии с предложенным соединением проведена путем изучения воздействия на эритроциты облученной порошком плазмы крови. Фосфоресценция порошка с фиксированный массой 0,005 ± 0,001 г имеет максимум на длине волны 491,5 нм при накачке лазером с длиной волны 473 нм с мощностью 100 мВт. Затем его смешивают с центрифугированной плазмой крови в течение определенного периода времени (5, 10, 15 и 20 мин). Полученные результаты демонстрируют, что 5-минутное облучение является оптимальным периодом для эритроцитов с точки зрения улучшения морфологии и увеличения спектра поглощения УФ-видимой области по крайней мере на 21% по сравнению с контрольной кровью. При этом значительный прирост приходится на длины волн 340 нм и 414 нм, которые увеличиваются на 54% и 41% соответственно. Однако, для 10 мин и более облучение вызывает ухудшение морфологии, в то время как УФ-видимый спектр уменьшается начиная с 15 мин и позже. В связи с этим изучается сравнение плазмы крови, которая взаимодействовала с фосфоресцирующим порошком, с нефосфоресцирующим порошком, чтобы показать, что излучение играет роль в создании эффекта фототерапии.

Phototherapy has shown its effect on cell stimulation and inhibition based on Arndt-Schulz model. Even though this therapeutic method has apparent effect, but it has limitations for epithelial application due to limitations on light penetration. Hence, with the ideology of fully overcoming this limitation, phosphorescent powder (strontium aluminate) is proposed as the potential light source that emitting photon from inside the body for phototherapy purposes. The strontium aluminate powder used in the experiment has the highest peak absorption at wavelength around 650 nm and lowest at around 350 nm. According to FESEM images, the powder has the particle size varies from 10 to 50 μm at cubic phase. The assessment is done by studying the effect on erythrocyte after blood plasma is irradiated by strontium aluminate powder’s photon. The powder luminesces with a maximum at 491.5 nm when pumped with 473 nm laser at 100 mW in fixed amount of 0.005±0.001 g. Later, it is mixed with  centrifuged blood plasma for a predetermined time period (5, 10, 15, and 20 minutes). From this study, it shows that 5 minutes irradiation is the optimum  period for erythrocyte in term of morphology enhancement and increase of UV-visible absorption spectrum with at least 21% in comparing  with control blood. While the significant increment located at wavelengths 340 nm and 414 nm with both increased by 54% and 41%, respectively. However, for 10 minutes and beyond, the irradiation leads to morphology deterioration while the UV-visible spectrum decrement starts at 15 minutes and beyond. In conjunction, a comparison between blood plasma that either interacted with powder emitting photon or powder with no emission shows that photon emission plays a role in the phototherapy effect.

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The authors declare that there are no conflicts of interest present.