Three-Fibre-Based Diffuse Reflectance Spectroscopy for Estimation of Total Solid Content in Natural Rubber Latex

Abstract

It is shown that three-fibre-based diffuse reflectance spectroscopy, based on spatially resolved near infrared spectroscopy in the wavelength range 850-1060 nm, is a promising method for the measurement of quality in natural rubber latex samples. Absorbance ratios were defined as the ratio of light intensity detected at distances r and r + D from the emitter fibre. A relative absorbance ratio g was then calculated using the absorbance ratios at three wavelengths. Parameter g had a strong linear correlation with total solid content in latex (range 0.3-0.6 g g −1) with a coefficient of determination value of 0.98 and root mean square error for total solid content of 0.014 g g −1. Although the near infrared spectra measured by conventional transmission or reflectance spectroscopy were highly affected by the scattering coefficient in the sample, simulation results in this study showed that the effects of scattering in the samples on g can be reduced.

Effect of cellular structure on the optical properties of wood

“…We believe that the interpretation of scattering phenomenon in wood enabled construction of a robust regression model for the estimation of MC or chemical concentration without using chemometric approaches such as PLS regression. Using the three fiber diffuse reflectance spectroscopy (TFDRS), 13 it is possible to construct a handheld device using LEDs as the light source, because the proposed parameter γ in this method, which is calculated using the ratio of light intensity detected at two difference distances from light source, is independent of the optical path length and exhibits good linear correlation with the analyte material concentration. The interpretation and determination of scattering properties in wood has led to the determination of the optimal optical system for TFDRS.…”

Rapid Evaluation of the Properties of Natural Rubber Latex and Its Products Using Near-Infrared Spectroscopy

“…Three-fibre-based diffuse reflectance spectroscopy (TFDRS) was employed by Inagaki et al [24] for the measurement of TSC in natural rubber latex samples. It was reported that TSC could be accurately predicted using the relative absorbance ratio even if the samples have significant variation in polyisoprene particle sizes (i.e.…”

Green Determination of Urea in Moisturizers by Diffuse Reflectance Spectroscopy

“…This purpose of the present work was to provide a method that is safer for the operator and the environment by complying with the principles of green chemistry (Anastas and Kirchhoff 2002) as well as being fast, simple, and inexpensive. As an alternative methodology that is eco-friendly, the combination of diffuse reflectance spectroscopy with spot tests has been described for the determination of drugs in routine clinical procedures (Gotardo et al 2004;Lima et al 2009: Capiau et al 2016Ehiwe et al 2016), food analysis (Luiz, Pezza, and Pezza 2012;Rossini et al 2016), quality control (Inagaki et al 2016;Rahoui et al 2016), and determination of contaminants (Tubino, Rossi, and Magalhães 1997;Okparanma, Coulon, and Mouazen 2014).…”