Low‐Field Nuclear Magnetic Resonance Time Domain Characterization of Polyunsaturated Fatty Acid – Rich Linseed and Fish Oil Emulsions during Thermal Air Oxidation

2021 ◽  
Author(s):  
Maysa T. Resende ◽  
Charles Linder ◽  
Zeev Wiesman
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fatty Acid ◽  
Magnetic Resonance ◽  
Fish Oil ◽  
Time Domain ◽  
Air Oxidation ◽  
Low Field ◽  
Oil Emulsions ◽  
Time Domain Characterization

scholarly journals Characterization of moisture in acetylated and propionylated radiata pine using low-field nuclear magnetic resonance (LFNMR) relaxometry

Holzforschung ◽  
2018 ◽  
Vol 72 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Greeley Beck ◽  
Emil Engelund Thybring ◽  
Lisbeth Garbrecht Thygesen ◽  
Callum Hill
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Cell Wall ◽  
Magnetic Resonance ◽  
Relaxation Times ◽  
Radiata Pine ◽  
Saturation Point ◽  
Weight Percentage ◽  
Low Field ◽  
Nuclear Magnetic

AbstractMoisture in radiata pine (Pinus radiataD. Don) earlywood (EW), which was acetylated or propionylated to various degrees, was measured by low-field nuclear magnetic resonance (LFNMR) relaxometry. Spin-spin relaxation times (T2) were determined for fully saturated samples at 22 and −18°C.T2values for EW lumen water increased with increasing acetylation weight percentage gain (WPG), perhaps caused by the less hydrophilic acetylated wood (AcW) surface. Cell wall water (WCW) and the water in pits and small voids also showed increasingT2values as a function of WPG but with a weaker tendency. A possible explanation is the counteracting effects of decreased hydrophilicity and reduced moisture content (MC) of these water populations at higher levels of acetylation. The evaluation of propionylation on WCWT2data was complicated by peak splitting in the relaxation spectrum. ConstantT2values for void water populations at various WPG levels for propionylated samples indicate a modification gradient in the cell wall. Fiber saturation point (FSP) was significantly reduced by both modifications. Slightly higher FSP values for propionylated samples suggest that physical bulking is not the only factor causing moisture exclusion in AcW. But this interpretation is tentative because of the possibility of cell wall damage caused by propionylation.

scholarly journals Effect of compression refining on fiber properties

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8696-8707
Author(s):  
Jari Käyhkö ◽  
Eero Hiltunen ◽  
Yrjö Hiltunen ◽  
Ekaterina Nikolskaya ◽  
Lauri Kulmala ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Energy Consumption ◽  
Magnetic Resonance ◽  
Time Domain ◽  
Strength Properties ◽  
Net Energy ◽  
Fiber Properties ◽  
Nmr Method ◽  
Low Field ◽  
Softwood Pulp

This article shows how fiber properties obtained by the compression refining of bleached softwood pulp refined using a KID 300 refiner differs from traditional bar refining. A KID refiner is a stone crusher that has been modified to refine fiber, and it offers a refining method that could be used at the mill scale. This study showed that compression refining caused more internal fibrillation compared with blade refining and improved the pulp’s ability to be beaten. Net energy consumption in compression refining was less than that of bar refining. Compression refining yielded pulp with shorter fibers and a higher number of fines, kinks, and curves. Still, the strength properties of the paper were the same level as bar-refined pulp, probably due to the higher internal fibrillation and flexibility of the fibers. It was also shown that the low field time-domain nuclear magnetic resonance (TD-NMR) method was capable of measuring the porosity and internal fibrillation of the fiber.

Simultaneous Quantification of Oil and Protein in Cottonseed by Low-Field Time-Domain Nuclear Magnetic Resonance

2011 ◽  
Vol 88 (10) ◽  
pp. 1521-1529 ◽  
Author(s):  
Patrick J. Horn ◽  
Purnima Neogi ◽  
Xenia Tombokan ◽  
Supriyo Ghosh ◽  
B. Todd Campbell ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Time Domain ◽  
Simultaneous Quantification ◽  
Low Field ◽  
Nuclear Magnetic
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