Determination of Tobacco Constituents with Acousto-Optic Tunable Filter-Near Infrared Spectroscopy

Abstract

In the present work, we developed an acousto-optic tunable fi lter near infrared (AOTF-NIR) refl ectance spectroscopy method for determining tobacco constituents. The NIR spectra of 443 tobacco samples were collected using an AOTF-NIR spectrometer. Calibration models for total sugar, reducing sugar, nicotine and potassium in tobacco were built by partial least squares (PLS) regression for which regression R 2 were 0.984, 0.987, 0.988 and 0.920, respectively and the average relative standard deviations between the predicted values and the measured values were 2.68%, 2.88%, 4.18% and 8.38%, respectively. The results indicate that the AOTF-NIR technique is feasible for the analysis of tobacco constituents and provides a foundation for on-line monitoring in the tobacco process. To our knowledge, this is the fi rst attempt to analyse tobacco constituents with AOTF-NIR spectroscopy.

Feasible Application of a Portable NIR-AOTF Tool for On-Field Prediction of Phenolic Compounds during the Ripening of Olives for Oil Production

“…This is a portable device which can be used directly in the field on-tree, even though in this specific case spectral detections were conducted under laboratory conditions. Two different measurements were performed on each intact olive through contact between the external gun of the NIR device and the epicarp of the fruit, using the diffuse reflectance method of detection, while the raw spectra were detected and recorded in transmittance, as reported by other authors. , Detection was conducted in the 1100–2300 nm range, with 2 nm wavelength increments and 10 spectra per average, which represented a single measurement. The average of the two measurements was the spectral response of the fruit.…”

“…Other applications on different products are reported concerning NIR-AOTF spectroscopy: Kay and Wample discriminated among areas of production of Cabernet Sauvignon grapes on the basis of total phenolics, anthocyanins, malvidin-3-glucoside, and tartaric and malic acid estimations; Santos and Kaye applied the NIR-AOTF for potential grapevine leaf water detection. The same tool was tested by He et al for determination of principal constituents in tobacco, and more recently, Bellincontro et al − used NIR-AOTF spectroscopy to monitor grape dehydration and quality evolution of hazelnuts during storage. Phenolic content prediction by NIR spectroscopy was already tested in grapes and in various food commodities, but until now, there are no references in this field about olive fruits.…”

Near-infrared spectroscopy and imaging in food quality and safety

“…The NIR spectrometer was equipped with an AOTF working in the 1,200-2,400 nm wavelength range [59]. He et al utilized, for the first time, a portable NIR spectrometer for analyzing tobacco leaf constituents [60]. The NIR system was a Luminar 5030-731 spectrometer (Brimrose Corp., Baltimore, MD, USA).…”

A diffuse reflectance portable near infrared spectroscopy system for the determination of biuret content in urea fertilizer

“…3 The portable and handheld spectrometers are simple, which allow the spectrometer to be taken to the sample and move the laboratory to the point of need-the location of the sample. 4 There were several kinds of portable and handheld instruments without moving parts, such as grating instrument, linear variable filter (LVF), 5 micro-electromechanical system (MEMS), 6 acousto-optic tunable filter (AOTF) 7 and DMD. 8 Considerable attention has been given to the miniaturization and portability of spectroscopic devices in recent years.…”