Assessment of total phenols and extractives of mahogany wood by near infrared spectroscopy (NIRS)

Holzforschung ◽  
2013 ◽  
Vol 67 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Allan Ribeiro da Silva ◽  
Tereza Cristina Monteiro Pastore ◽  
Jez Willian Batista Braga ◽  
Fabrice Davrieux ◽  
Esmeralda Yoshico Arakaki Okino ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Phenolic Compounds ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Water Soluble ◽  
Hot Water ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Total Phenolic Compounds ◽  
Minimum Concentration

Abstract The resistance to decomposition of mahogany wood (Sweitenia macrophylla King) ranges from high to moderate level. Wood extractives, mainly due to the presence of phenol compounds are related to the natural durability of wood. The technique of near infrared spectroscopy (NIRS) coupled with multivariate analysis has been applied to assess the extractives and phenols of 41 samples of mahogany in powder form. The hot water-soluble extractives were quantitatively determined, and total phenol content was measured with the Folin-Denis colourimetric reagent. Models were developed with the NIRS data for each of the two variables. The results indicated that NIRS can be a useful tool to a rapid evaluation of the extractive contents and total phenolic compounds of mahogany wood. The method was able to predict the interesting properties with errors lower than 10% (w/w) and had the capability of detecting samples that have a minimum concentration of 2.4% (w/w) of extractives and total phenolic compounds, respectively.

scholarly journals Determination of total phenolic compounds in yerba mate (Ilex paraguariensis) combining near infrared spectroscopy (NIR) and multivariate analysis

LWT ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 795-801 ◽  
Author(s):  
Cátia N.T. Frizon ◽  
Gabrieli A. Oliveira ◽  
Camila A. Perussello ◽  
Patrício G. Peralta-Zamora ◽  
Ana M.O. Camlofski ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Infrared Spectroscopy ◽  
Phenolic Compounds ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ilex Paraguariensis ◽  
Total Phenolic ◽  
Yerba Mate ◽  
Total Phenolic Compounds

scholarly journals Estimation of phenolic compounds and antioxidant capacity in leaves of fruit species using near-infrared spectroscopy and a chemometric approach

2021 ◽  
pp. 109-119
Author(s):  
Darly Rodrigues Pompeu ◽  
Audrey Pissard ◽  
Hervé Rogez ◽  
Pascal Dupont ◽  
Marc Lateur ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Phenolic Compounds ◽  
Antioxidant Capacity ◽  
Phenolic Compound ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Prunus Avium ◽  
Total Phenolic ◽  
Statistical Parameters ◽  
Fruit Species

Description of the subject. Phenolic compounds are very important to the antioxidant capacity of plant species. Phenolic compounds and hence antioxidant capacity are commonly measured in the laboratory using indirect methods that involve several stages and chemicals. Objectives. This study aims to identify species with high content of phenolic compounds and antioxidant capacity and to measure these parameters in the leaves of fruit species using near-infrared spectroscopy (NIRS). Method. A total of 68 samples of different varieties of Prunus avium, Prunus cerasus, Malus domestica, Prunus domestica, Pyrus communis, Vitis vinifera, Ficus carica and Corylus avellana were investigated. The dried ground leaves were scanned in reflectance mode and the phenolic compound content (total phenolic compounds, total flavanols and total flavonols) and antioxidant capacity (2-2-diphenyl-1-picrylhydazil [DPPH] and oxygen radical absorbance capacity [ORAC]) were determined. Results. Great variability of phenolic compound content and antioxidant capacity was observed between species (inter-species) and between varieties (intra-species). The spectra with and without pre-treatments were tested to correlate with the phenolic compound content and antioxidant capacities. The pre-treatments tested showed a slight improvement in statistical parameters (R²CAL > 0.75; R²CV > 0.21; RPD > 1.1). Conclusions. The results suggest that NIR spectroscopy with chemometric approaches could be used to rapidly estimate the phenolic compound content and antioxidant capacity of the leaves of fruit species. The species evaluated in this study were shown to be a rich source of phenolic compounds and antioxidants.

scholarly journals Near Infrared Spectroscopy as a Green Technology for the Quality Prediction of Intact Olives

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1042
Author(s):  
Silvia Grassi ◽  
Olusola Samuel Jolayemi ◽  
Valentina Giovenzana ◽  
Alessio Tugnolo ◽  
Giacomo Squeo ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Olive Oil ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Green Technology ◽  
Soluble Solids ◽  
Integrating Sphere ◽  
Total Phenolic ◽  
Handheld Device ◽  
Quality Design

Poorly emphasized aspects for a sustainable olive oil system are chemical analysis replacement and quality design of the final product. In this context, near infrared spectroscopy (NIRS) can play a pivotal role. Thus, this study aims at comparing performances of different NIRS systems for the prediction of moisture, oil content, soluble solids, total phenolic content, and antioxidant activity of intact olive drupes. The results obtained by a Fourier transform (FT)-NIR spectrometer, equipped with both an integrating sphere and a fiber optic probe, and a Vis/NIR handheld device are discussed. Almost all the partial least squares regression models were encouraging in predicting the quality parameters (0.64 < R2pred < 0.84), with small and comparable biases (p > 0.05). The pair-wise comparison between the standard deviations demonstrated that the FT-NIR models were always similar except for moisture (p < 0.05), whereas a slightly lower performance of the Vis/NIR models was assessed. Summarizing, while on-line or in-line applications of the FT-NIR optical probe should be promoted in oil mills in order to quickly classify the drupes for a better quality design of the olive oil, the portable and cheaper Vis/NIR device could be useful for preliminary quality evaluation of olive drupes directly in the field.

Quantitative Analysis of Radix Rehmanniae from Genuine Producing Area by Near Infrared Spectroscopy

2014 ◽  
Vol 912-914 ◽  
pp. 2010-2013
Author(s):  
Hai Yan Gong ◽  
Cai Xia Xie ◽  
Ming Xia Wu ◽  
Yong Xia Cui ◽  
Zhi Hong Chen ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Quantitative Analysis ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Water Extract ◽  
Partial Least Square ◽  
Water Soluble ◽  
Least Square ◽  
Analysis Model ◽  
Soluble Components

In this paper the water extract of Radix Rehmanniae from genuine producing area was rapidly determined by near-infrared spectroscopy (NIRS). The quantitative analysis model of the water extraction of Radix Rehmanniae was established by Partial Least Square (PLS). The correlation coefficient of calibration (R2) was 0.99529; the root-mean-square error of prediction (RMSEP) was 0.134. The results indicated that the water-soluble components in Radix Rehmanniae from genuine producing area can be rapidly and accurately determined by near-infrared spectroscopy technology.

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