Monitoring the Transesterification Reaction Used in Biodiesel Production, with a Low Cost Unilateral Nuclear Magnetic Resonance Sensor

2011 ◽  
Vol 25 (6) ◽  
pp. 2696-2701 ◽  
Author(s):  
Luis F. Cabeça ◽  
Lucinéia V. Marconcini ◽  
Giovanni P. Mambrini ◽  
Rodrigo B. V. Azeredo ◽  
Luiz A. Colnago
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Cost ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Resonance Sensor ◽  
Nuclear Magnetic

scholarly journals Mini Inside-Out Nuclear Magnetic Resonance Sensor Design for Soil Moisture Measurements

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1682 ◽  
Author(s):  
Jiamin Wu ◽  
Pan Guo ◽  
Sheng Shen ◽  
Yucheng He ◽  
Xin Huang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Soil Moisture ◽  
Magnetic Resonance ◽  
Sandy Soil ◽  
Particle Diameter ◽  
Silica Sand ◽  
Resonance Sensor ◽  
Small Pore ◽  
Inside Out ◽  
Nuclear Magnetic

The improvement of water management in agriculture by exactly detecting moisture parameters of soil is crucial. To investigate this problem, a mini inside-out nuclear magnetic resonance sensor (NMR) was proposed to measure moisture parameters of model soils. This sensor combines three cylindrical magnets that are magnetized in the axial direction and three arc spiral coils of the same size in series. We calculated and optimized the magnet structure by equivalent magnetization to current density. By adjusting the radius and height between the cylinders, a circumferential symmetric constant gradient field (2.28 T/m) was obtained. The NMR sensor was set at 2.424 MHz to measure the water content of sandy soil with small particle diameter and silica sand with large particle diameter. The complete decaying, an NMR signal was analyzed through inverse Laplace transformation and averaged on a T2 space. According to the results, moisture content of the sample is positively correlated with the integral area of T2 spectrum peak (Apeak); T2 of the water in small pores is shorter than that in large pores, because the movement of water molecules are limited by the inner wall of the pores. In the same volume, water in large pore sample is more than that in small pore sample, so Apeak of silica sand is larger than Apeak of sandy soil. Therefore, the sensor is capable of detecting moisture both content and pore size of the sample. This mini sensor (4.0 cm in diameter and 10 cm in length) is portable, and the lowest measurable humidity is 0.38%. Thus, this sensor will allow easy soil moisture measurements on-field in the future.

Kinetic study by 1H nuclear magnetic resonance spectroscopy for biodiesel production from castor oil

2011 ◽  
Vol 178 ◽  
pp. 391-397 ◽  
Author(s):  
J. Mendieta López ◽  
T. del N.J. García Cota ◽  
E.E. Galindo Monterrosas ◽  
R. Nájera Martínez ◽  
V.M. de la Cruz González ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Kinetic Study ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Castor Oil ◽  
Biodiesel Production ◽  
Resonance Spectroscopy ◽  
1H Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

scholarly journals <sup>129</sup>Xe ultra-fast Z spectroscopy enables micromolar detection of biosensors on a 1 T benchtop spectrometer

2021 ◽  
Vol 2 (1) ◽  
pp. 409-420
Author(s):  
Kévin Chighine ◽  
Estelle Léonce ◽  
Céline Boutin ◽  
Hervé Desvaux ◽  
Patrick Berthault
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Exchange ◽  
Low Cost ◽  
Indirect Detection ◽  
Low Field ◽  
Cage Molecules ◽  
Temporal Encoding ◽  
Spatio Temporal ◽  
Nuclear Magnetic

Abstract. The availability of a benchtop nuclear magnetic resonance (NMR) spectrometer, of low cost and easily transportable, can allow detection of low quantities of biosensors, provided that hyperpolarized species are used. Here we show that the micromolar threshold can easily be reached by employing laser-polarized xenon and cage molecules reversibly hosting it. Indirect detection of caged xenon is made via chemical exchange, using ultra-fast Z spectroscopy based on spatio-temporal encoding. On this non-dedicated low-field spectrometer, several ideas are proposed to improve the signal.

scholarly journals Unbiased Electro-Optic Waveguide as a Sensitive Nuclear Magnetic Resonance Sensor

2014 ◽  
Vol 26 (12) ◽  
pp. 1266-1269 ◽  
Author(s):  
Reina Ayde ◽  
Gwenalel Gaborit ◽  
Jean Dahdah ◽  
Lionel Duvillaret ◽  
Nadege Courjal ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Electro Optic ◽  
Resonance Sensor ◽  
Optic Waveguide ◽  
Nuclear Magnetic

scholarly journals Sparse isotope labeling for nuclear magnetic resonance (NMR) of glycoproteins using 13C-glucose

Glycobiology ◽  
2020 ◽  
Author(s):  
Monique J Rogals ◽  
Jeong-Yeh Yang ◽  
Robert V Williams ◽  
Kelley W Moremen ◽  
I Jonathan Amster ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Isotope Labeling ◽  
Low Cost ◽  
Functional Screening ◽  
Mammalian Expression ◽  
Metabolic Substrates ◽  
Nmr Characterization ◽  
Nuclear Magnetic ◽  
Glycosylated Proteins

Abstract Preparation of samples for nuclear magnetic resonance (NMR) characterization of larger proteins requires enrichment with less abundant, NMR-active, isotopes such as 13C and 15N. This is routine for proteins that can be expressed in bacterial culture where low-cost isotopically enriched metabolic substrates can be used. However, it can be expensive for glycosylated proteins expressed in mammalian culture where more costly isotopically enriched amino acids are usually used. We describe a simple, relatively inexpensive procedure in which standard commercial media is supplemented with 13C-enriched glucose to achieve labeling of all glycans plus all alanines of the N-terminal domain of the highly glycosylated protein, CEACAM1. We demonstrate an ability to detect partially occupied N-glycan sites, sites less susceptible to processing by an endoglycosidase, and some unexpected truncation of the amino acid sequence. The labeling of both the protein (through alanines) and the glycans in a single culture requiring no additional technical expertise past standard mammalian expression requirements is anticipated to have several applications, including structural and functional screening of the many glycosylated proteins important to human health.

scholarly journals Ferrocenyl imidazolo[2,1-b]-1,3,4-thiadiazoles: A microwave-assisted catalyst-free synthesis, characterization, and biological activities

2020 ◽  
pp. 174751982093990
Author(s):  
Yuting Liu ◽  
Lan Yang ◽  
Dawei Yin
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Biological Activities ◽  
Low Cost ◽  
Microwave Assisted ◽  
Catalyst Free ◽  
Alkyl Groups ◽  
13C Nuclear Magnetic Resonance ◽  
1H Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

Ferrocenyl imidazolo[2,1- b]-1,3,4-thiadiazoles are synthesized using 2-amino-5-substituted-1,3,4-thiadiazole and α-bromoacetyl ferrocene as substrates under microwave-assisted and catalyst-free conditions. The structures are characterized by infrared, 1H nuclear magnetic resonance, 13C nuclear magnetic resonance, mass spectrometry, and elemental analysis. Compared with conventional methods, the present protocol has the advantages of being rapid, efficient, environmentally friendly, and low cost. The results of biological activity studies showed that the products displayed better activities than those of 2-amino-5-substituted-1,3,4-thiadiazole. The biological activities of compounds in which R = phenyl were better than those with alkyl groups. Compounds with electron-withdrawing groups on the aryl moiety showed increased biological activities.

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