Vibrational and electronic spectroscopic studies of melatonin

Singh, Gurpreet; Abbas, Jasim M.; Dogra, Sukh Dev; Sachdeva, Ritika; Rai, Balwant; Tripathi, S. K.; Prakash, Satya; Sathe, Vasant; Saini, G. S. S.

doi:10.1016/j.saa.2013.08.077

Cited by 21 publications

(40 citation statements)

References 29 publications

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“…The peak experimentally observed at 1664 cm -1 [1] was calculated at 1701 and 1602 cm -1 for the HF and DFT/B3LYP levels with 90% contribution of PED, respectively. In the present work, the calculated frequencies for the ν(C-N) vibrations were obtained in the range of 1420-623 cm −1 and 1403-610 cm −1 using the HF and DFT/B3LYP methods, respectively, and show excellent agreement with the literature [39]. As indicated by PED, these modes are contributed to the range 10-42%.…”

Section: C=n C-n and C-s Vibrationssupporting

confidence: 78%

Oksamil molekülünün moleküler yapısının, spektroskopik, elektronik ve NLO özelliklerinin teorik olarak incelenmesi

Eşme

2017

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Section: C=n C-n and C-s Vibrationssupporting

confidence: 78%

Oksamil molekülünün moleküler yapısının, spektroskopik, elektronik ve NLO özelliklerinin teorik olarak incelenmesi

Eşme

2017

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…Most molecules have their molecular vibrational and rotational frequencies in the infrared spectrum [ 1 ] while the electronic transitions fall in the visible and UV range. For example, many organic compounds such as small pharmaceuticals and biomolecules have electronic transitions at energies in the UV range [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], as shown in Figure 1 . Therefore, to achieve optimal frequency matching between hot-spots and molecule’s electronic transitions, the selected nanomaterials must have maximum optical response in the UV range.…”

Section: Introductionmentioning

confidence: 99%

Non-Absorbing Dielectric Materials for Surface-Enhanced Spectroscopies and Chiral Sensing in the UV

et al. 2020

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Low-loss dielectric nanomaterials are being extensively studied as novel platforms for enhanced light-matter interactions. Dielectric materials are more versatile than metals when nanostructured as they are able to generate simultaneously electric- and magnetic-type resonances. This unique property gives rise to a wide gamut of new phenomena not observed in metal nanostructures such as directional scattering conditions or enhanced optical chirality density. Traditionally studied dielectrics such as Si, Ge or GaP have an operating range constrained to the infrared and/or the visible range. Tuning their resonances up to the UV, where many biological samples of interest exhibit their absorption bands, is not possible due to their increased optical losses via heat generation. Herein, we report a quantitative survey on the UV optical performance of 20 different dielectric nanostructured materials for UV surface light-matter interaction based applications. The near-field intensity and optical chirality density averaged over the surface of the nanoparticles together with the heat generation are studied as figures of merit for this comparative analysis.

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“…Several spectroscopic methods including UV-VIS spectroscopy [4], nuclear magnetic resonance (NMR) spectroscopy [5], infrared spectroscopy (IR) [6,7], and Raman spectroscopy [8,9] have been successfully applied in the chemical analysis of hormone-based drugs. Among the IR-based methods, the emphasis has been given to Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy [9,10,11]. Developments in the terahertz (THz) technology show a promising potential for applications in many fields [12,13,14,15,16,17,18] with great emphasis on the pharmaceutical industry [19,20,21,22,23], as the far-infrared frequency range may be employed for the chemical screening and analysis of substances.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, THz spectroscopy and THz imaging studies of melatonin and its pharmaceutical product have not been reported yet. FTIR spectrum studies of melatonin close to THz frequency range [10] have been performed, whereby infrared absorption spectra of melatonin in 1700–70 cm −1 were measured. The experimental FTIR spectrum of melatonin showed one characteristic absorption peak below 137 cm −1 , corresponding to 4.11 THz.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic Analysis of Melatonin in the Terahertz Frequency Range

Puc

Abina

Jeglic

et al. 2018

Sensors

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There is a need for fast and reliable quality and authenticity control tools of pharmaceutical ingredients. Among others, hormone containing drugs and foods are subject to scrutiny. In this study, terahertz (THz) spectroscopy and THz imaging are applied for the first time to analyze melatonin and its pharmaceutical product Circadin. Melatonin is a hormone found naturally in the human body, which is responsible for the regulation of sleep-wake cycles. In the THz frequency region between 1.5 THz and 4.5 THz, characteristic melatonin spectral features at 3.21 THz, and a weaker one at 4.20 THz, are observed allowing for a quantitative analysis within the final products. Spectroscopic THz imaging of different concentrations of Circadin and melatonin as an active pharmaceutical ingredient in prepared pellets is also performed, which permits spatial recognition of these different substances. These results indicate that THz spectroscopy and imaging can be an indispensable tool, complementing Raman and Fourier transform infrared spectroscopies, in order to provide quality control of dietary supplements and other pharmaceutical products.

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Vibrational and electronic spectroscopic studies of melatonin

Cited by 21 publications

References 29 publications

Oksamil molekülünün moleküler yapısının, spektroskopik, elektronik ve NLO özelliklerinin teorik olarak incelenmesi

Oksamil molekülünün moleküler yapısının, spektroskopik, elektronik ve NLO özelliklerinin teorik olarak incelenmesi

Non-Absorbing Dielectric Materials for Surface-Enhanced Spectroscopies and Chiral Sensing in the UV

Spectroscopic Analysis of Melatonin in the Terahertz Frequency Range

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