Author response for "Analysis of water content in wood material through 1D and 2D 1 H NMR relaxometry: application to the determination of the dry mass of wood"

2020 ◽  
Author(s):  
Leila Rostom ◽  
Sabine Caré ◽  
Denis Courtier‐Murias
Keyword(s):  
Water Content ◽  
Dry Mass ◽  
Author Response ◽  
Wood Material ◽  
H Nmr ◽  
Nmr Relaxometry

scholarly journals Investigation of the effect of aging on wood hygroscopicity by 2D 1H NMR relaxometry

Holzforschung ◽  
2020 ◽  
Vol 74 (4) ◽  
pp. 400-411 ◽  
Author(s):  
Leila Rostom ◽  
Denis Courtier-Murias ◽  
Stéphane Rodts ◽  
Sabine Care
Keyword(s):  
Cell Walls ◽  
Molecular Level ◽  
Bound Water ◽  
Proton Nuclear Magnetic Resonance ◽  
Wood Material ◽  
H Nmr ◽  
Nmr Relaxometry ◽  
Wood Chemical Composition ◽  
S2 Layer ◽  
1H Nmr Relaxometry

AbstractTwo-dimensional proton nuclear magnetic resonance (2D 1H NMR) relaxometry is increasingly used in the field of wood sciences due to its great potential in detecting and quantifying water states at the level of wood constituents. More precisely, in this study, this technique is used to investigate the changes induced by “natural” and “artificial” aging methods on modern and historical oak woods. Two bound water components are detected and present differences in terms of association to the different wood polymers in cell walls: one is more strongly associated with wood polymers than the other. The evolution of the two bound water types is discussed in regard to aging methods and is related to the structure of the cell wall, especially with the S2 layer and the evolution of wood chemical composition (cellulose, hemicelluloses and lignin). The evolution of hydric strains is also discussed taking into account the effect of aging methods on the two bound water components. The obtained results confirm the ability of 2D 1H NMR relaxometry to evaluate the effect of aging at the molecular level and on hydric deformation. Furthermore, this method shows that it is possible to determine the moisture content of wood without the necessity to oven-dry the wood material.

Determination of Water Content in Bioethanol Using the 1 H NMR Chemical Shift Change

2019 ◽  
Vol 40 (4) ◽  
pp. 313-316
Author(s):  
Jeongbin Yoon ◽  
Suyeon Yun ◽  
Byungjoo Kim ◽  
Sangdoo Ahn ◽  
Kihwan Choi
Keyword(s):  
Chemical Shift ◽  
Water Content ◽  
Chemical Shift Change ◽  
Nmr Chemical Shift ◽  
H Nmr ◽  
Shift Change

scholarly journals NMR determination of sorption isotherms in earlywood and latewood of Douglas fir. Identification of bound water components related to their local environment

Holzforschung ◽  
2017 ◽  
Vol 71 (6) ◽  
pp. 481-490 ◽  
Author(s):  
Marie Bonnet ◽  
Denis Courtier-Murias ◽  
Paméla Faure ◽  
Stéphane Rodts ◽  
Sabine Care
Keyword(s):  
Relaxation Times ◽  
Bound Water ◽  
Sorption Isotherms ◽  
Local Environment ◽  
Douglas Fir ◽  
Adsorption Mechanisms ◽  
H Nmr ◽  
Nmr Relaxometry ◽  
Sorption Energy

Abstract Earlywood (EW) and latewood (LW) have different hygromechanical behaviors, if subjected to relative humidity (RH) variations. To understand this effect better, the adsorption mechanisms of EW and LW of Douglas fir were studied by 2D 1H NMR relaxometry under conditions of equilibrium moisture content (EMC) at 20°C. Two bound water components were detected with relaxation times T1 and T2 indicating that they are located in distinct environments but these are similar in EW and LW. Sorption isotherms were calculated and analyzed based on the sorption model of Dent. A difference of sorption energy between the two water components is in agreement with their mobility difference observed on T1−T2 correlation spectra. Moreover, for the two bound water components, EW and LW exhibit different sorption isotherms at high RH. This may be attributed to a difference of adsorption capacity. Based on the macrofibril models provided by the literature, the following hypothesis is proposed: bound water components are located in lamellar and lenticular areas, both leading to possible deformations.

Comparison of different methods for the determination of the water content and the dry mass correction factor in various plant samples

1998 ◽  
Vol 360 (5) ◽  
pp. 601-604 ◽  
Author(s):  
S. Stegen ◽  
F. Queirolo ◽  
P. Ostapczuk ◽  
A. Groemping ◽  
M. Paz ◽  
...  
Keyword(s):  
Water Content ◽  
Correction Factor ◽  
Dry Mass ◽  
Mass Correction ◽  
Plant Samples

scholarly journals Determination of water content in infant formula

2019 ◽  
pp. 37-42
Keyword(s):  
Water Content ◽  
Infant Formula ◽  
Reference Method ◽  
Dry Mass ◽  
Karl Fischer Titration ◽  
Karl Fischer ◽  
Different Types ◽  
The Stability ◽  
Water Contents

Water is one of the most important constituents of food, very important to be accurately quantified. Furthermore, water content affects the stability and shelf life of food. The evaluation of most chemical parameters is based on dry mass and many methods use heating which result in losing all volatile compounds, including water. Also, it is much harder to extract all of water if we have a complex matrix. Regarding this, the aim of this study was to determine water content in different infant formula by various methods. For examination of water content in three different types of infant formula three different techniques were used (oven sample processor, drying oven and halogen drying) and compared to classical Karl Fischer titration with two different solvents. Each sample was measured in ten probes, and classical Karl Fischer titration was used as a reference. The results showed that the reference method was the best regarding speed of measurement, amount of sample needed and obtained water contents (3.01- 4.35%), followed by Karl Fischer in boiling methanol (2.80-4.30), oven sample processor (2.96-4.23%), halogen drying (2.74-4.03%) and drying oven (2.38-3.52). Methods using heating could not remove all water from the sample within a reasonable time.

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