Density Functional Theory Modelled Absorption and Raman Spectra Applicable to Ergocalciferol (Vitamin D2) and Cholecalciferol (D3)

2021

The study establishes optically relevant lines by modelling ergocalciferol (D2) and cholecalciferol (D3) and compare these to measured and earlier reported absorption and Raman spectra lines. This is a step to reach a further goal of finding if minute Vitamin D (D2 and D3) concentration changes could be determined so that a non-invasive sensor could be developed with a reference to non-invasive measurements reported in [1] describing a Raman spectroscopy method of blood glucose concentration of threshold of 5 mmol/l. However, our concentrations are lower by two orders, i.e., 50 nmol/l. At such concentrations random-type metabolites may have an important role, like those related with person’…

Model of compact 3D electromagnetic solitons

2019

Density Functional Theory Calculated Raman Spectra of Ergocalciferol (Vitamin D2) and Cholecalciferol (D3)

2021

Density functional theory (DFT)-calculated Infrared and Raman spectra of Vitamin D2 and D3 are presented. The calculated results are compared with each other and with available experimental data. Applicability of Raman spectra for non-invasive optical Vitamin D sensors is discussed.

LUMINESCENCE STUDY OF DETERGENT OPTICAL BRIGHTENERS IN THE CONTEXT OF DEVELOPING OPTICAL ENVIRONMENTAL SENSORS FOR WATER QUALITY CONTROL

2006

Water quality and anthropogenic loads in many, but not all, cases are related. Some water quality monitoring programs analyse samples for the presence of Escherichia coli. These bacteria can come from humans and animals. Human‐attributable effluent contains optical brighteners (OBs) from detergents. A convenient and affordable optical quantitative method giving a linear luminescence outcome over several orders of detergent concentrations in the water solution is demonstrated. The proposed method uses the common presence of OBs in detergents. Detergent concentration in water can be used as a surrogate indicator of resultant anthropogenic loads in water bodies. The proposed optical method wit…

Optinių baliklių skalbimo priemonėse liuminescencijos tyrimas siekiant sukurti optinius aplinkosauginius vandens kokybės kontrolės jutiklius

2006

Water quality and anthropogenic loads in many, but not all, cases are related. Some water quality monitoring programs analyse samples for the presence of Escherichia coli. These bacteria can come from humans and animals. Human-attributable effluent contains optical brighteners (OBs) from detergents. A convenient and affordable optical quantitative method giving a linear luminescence outcome over several orders of detergent concentrations in the water solution is demonstrated. The proposed method uses the common presence of OBs in detergents. Detergent concentration in water can be used as a surrogate indicator of resultant anthropogenic loads in water bodies. The proposed optical method wit…

Optical method for determining optical brightener concentration in water solution

2006

The field of environmental sensors has been developing driven by the Baltic Sea environmental considerations. The authors propose the use of optical methods for developing sensitive, selective and low cost approach to address water media emitted matter research. An optical method to detect the human anthropogenic load presence in water bodies by measuring minute optical brighteners (OBs) concentration in water due to the laundry effluent is demonstrated. The authors propose to use OBs as a conveniently and affordably detectable optical parameter to compare the levels of human impact on the water bodies studied.