scholarly journals Best Conditions for the Production of Natural Isopentyl Acetate (Banana Aroma) from Cheese Industry Waste: An Experimental Precursor Approach

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1880
Author(s):  
Carlos Alberto Gómez-Aldapa ◽  
Javier Castro-Rosas ◽  
Antioco López-Molina ◽  
Carolina Conde-Mejía ◽  
Cuauhtémoc Francisco Pineda-Muñoz ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Maximum Rate ◽  
Isoamyl Alcohol ◽  
Maximum Output ◽  
Design Expert ◽  
Industry Waste ◽  
Cheese Industry ◽  
Isopentyl Acetate ◽  
Central Composite

In some fermentation systems, whey components (lactose, proteins and minerals) can produce isopentyl acetate (IA). An analysis of the best conditions for IA production with Kluyveromyces marxianus was developed in this work. The experiment design was two-factor and three-level design based on a response surface methodology (RSM) using Design-Expert® software. The analysis of anomeric protons by nuclear magnetic resonance (1H-NMR) showed 81.25% of β lactose content. This characteristic favored the production of IA. The maximum output (Mp) of IA, determined by gas chromatography, was 9.52 g/L (p < 0.05). The central composite design (CCD) was used to perform the factor analysis. Results showed that concentrations of 0.03 (g/L) ammonium sulphate and 0.3 (v/v) of isoamyl alcohol are the best conditions for a maximum rate of IA production. The production of IA can reduce the discharge of whey, allowing its reuse and revaluation.

Carbon-13 nuclear magnetic resonance spectrometric and gas chromatography/mass spectrometric characterization of lipids in corn suspension cells

1985 ◽  
Vol 57 (3) ◽  
pp. 710-715 ◽  
Author(s):  
Dennis James. Ashworth ◽  
Douglas Owen. Adams ◽  
Benjamin Yunwen. Giang ◽  
Michael Tung Hai. Cheng ◽  
Rino Yul. Lee
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Magnetic Resonance ◽  
Mass Spectrometric ◽  
Suspension Cells ◽  
Nuclear Magnetic

Comparison of hydrogenolysis with thioacidolysis for lignin structural analysis

Holzforschung ◽  
2014 ◽  
Vol 68 (2) ◽  
pp. 151-155 ◽  
Author(s):  
Daniel J. van de Pas ◽  
Bernadette Nanayakkara ◽  
Ian D. Suckling ◽  
Kirk M. Torr
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Nmr Spectroscopy ◽  
Structural Analysis ◽  
Magnetic Resonance ◽  
Gas Chromatography Mass Spectrometry ◽  
Aryl Ether ◽  
Chromatography Mass Spectrometry

Abstract Mild hydrogenolysis has been compared with thioacidolysis as a method for degrading lignins in situ and in isolated form before analysis by gas chromatography/mass spectrometry and quantitative 31P nuclear magnetic resonance (NMR) spectroscopy. Both degradation methods gave similar levels of β-aryl ether-linked phenylpropane units that were released as monomers. Degradation by hydrogenolysis generally gave lower levels of total phenylpropane units when analyzed by 31P NMR, especially in the case of lignins with high levels of condensed units. Overall, these results indicate that mild hydrogenolysis could offer an alternative to thioacidolysis for probing lignin structure.

Syntheses of methyl glycosides of 6-deoxyheptoses

1994 ◽  
Vol 72 (1) ◽  
pp. 247-251 ◽  
Author(s):  
Gerald O. Aspinall ◽  
Armando G. McDonald ◽  
Ramesh K. Sood
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Magnetic Resonance ◽  
Potassium Cyanide ◽  
Diisobutylaluminum Hydride ◽  
Carbohydrate Polymers ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Campylobacter Species ◽  
Hydrolysis Of

Methyl α-D-glycopyranosides of 6-deoxy-D-altro-heptose, 6-deoxy-D-manno-heptose, and 6-deoxy-D-talo-heptose have been prepared. Displacements of methyl 2,3,4-tri-O-benzylhexopyranoside 6-trifluoromethanesulfonates with potassium cyanide, followed by reduction of the resulting heptopyranosidurononitriles with diisobutylaluminum hydride, hydrolysis of the imine, further reduction with sodium borohydride, and catalytic O-debenzylation, give the corresponding methyl 6-deoxyheptopyranosides. Configurational change at C-4 of methyl 6-deoxy-7-O-tert-butyldiphenylsilyl-α-D-manno-heptopyranoside to give the talo isomer was effected by oxidation followed by stereoselective reduction. 1H nuclear magnetic resonance data of the glycosides, and gas chromatography of acetylated glycosides of (R)- and (S)-2-butanol serve to establish ring and enantiomeric configurations of the parent sugars when these are encountered as constituents of lipopolysaccharides or extracellular carbohydrate polymers, as in Campylobacter species.

scholarly journals Chemical Composition of Needle, Cone, and Branch Oils From Vietnamese Pinus cernua

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1985099 ◽  
Author(s):  
Tran Hui Thai ◽  
Nguyen Thi Hien ◽  
Le Ngoc Diep ◽  
Mathieu Paoli ◽  
Joseph Casanova ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Magnetic Resonance ◽  
Retention Index ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Main Component ◽  
Pine Species

Conifers are well represented in Vietnam where a new pine species has been recently discovered in Son La province: Pinus cernua, synonym P. armandii ssp. xuannhaensis. The compositions of needle, cone, and branch oils have been investigated by gas chromatography (retention index), gas chromatography-mass spectrometry, and 13C nuclear magnetic resonance. Myrcene (47.0%) was the main component of needle oil, followed by β-pinene (28.4%) and α-pinene (12.5%). Branch oil also contained myrcene (32.8%), α-pinene (17.9%), β-pinene (9.8%), and a high content of limonene (20.0%). Finally, cone oil displayed α-pinene (44.1%) beside myrcene (11.5%), β-pinene (8.1%), and limonene (5.8%).

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