Water desorption monitoring of cellulose pulps by NIR spectroscopy

Estimation of the basic density of Eucalyptus grandis wood chips at different moisture levels using benchtop and handheld NIR instruments

“…This trend was reported by Amaral et al (2020), who determined the Eucalyptus wood moisture content (approximately 80%) and observed the variations in the correlation factors with the spectral data. The water desorption patterns observed in this study were in agreement with other studies performed with wood and wood derivatives (Moretti et al, 2020;Lima et al, 2022a;Medeiros et al, 2023).…”

“…3B, the absorbance in the NIR spectra decreased as the water desorption occurred in the wood; this process started at the saturated condition (step 1), reached equilibrium with the environment (step 9), and ended in the anhydrous condition (step 10), with a total of 272 spectra per drying step. This behavior of the signatures according to the water content was in agreement with the results found by Medeiros et al (2023), who analyzed the desorption of water in cellulosic pulp with a benchtop NIR instrument.…”

“…For this purpose, eight latent variables were used to compare the results, and for cross-validation, the data selection method was randomized with eight segment numbers. In the test set, the spectra were separated into calibration and validation sets, using 60% of the data to calibrate the models and 40% to validate them, according to the data selection process proposed by Medeiros et al (2023).…”

“…The properties of the raw materials are routinely evaluated by the industries to standardize the quality of their products, especially density, as it is a property that has a direct correlation with the physical-mechanical characteristics of the wood, with direct implications for the behavior, processing, application and transport of the wood (Costa et al, 2019;Amaral et al, 2020). For these analyses, the technologies used are desired to be fast and effective for optimizing their production processes as opposed to conventional methods for determining the properties of wood, which are time-consuming and expensive (Medeiros et al, 2023). For this reason, the use of technologies for wood selection and monitoring is an alternative to increase the efficiency of wood production (Arriel et al, 2019).…”

Nondestructive Determination of Epicarp Hardness of Passion Fruit Using Near-Infrared Spectroscopy during Storage

“…Previous research has found large amounts of cellulose in passion fruit peel, which can be extracted and used to make nanofiber materials [ 23 ]. According to research, the area of about 7142 cm −1 may be ascribed to cellulose hydrogen bonds and O-H stretching, and chosen bands occur in this region in Figure 6 [ 24 ].…”