Isomerization and Epimerization of Galactose to Tagatose and Talose in a Phosphate Buffer Containing Organic Solvents under Subcritical Water Conditions

2021 ◽  
Author(s):  
Yuichiro Onishi ◽  
Yuya Furushiro ◽  
Shuji Adachi ◽  
Takashi Kobayashi
Keyword(s):  
Organic Solvents ◽  
Phosphate Buffer ◽  
Subcritical Water ◽  
Water Conditions

Production of phenolic compounds from rice bran biomass under subcritical water conditions

2010 ◽  
Vol 160 (1) ◽  
pp. 259-266 ◽  
Author(s):  
Omid Pourali ◽  
Feridoun Salak Asghari ◽  
Hiroyuki Yoshida
Keyword(s):  
Phenolic Compounds ◽  
Rice Bran ◽  
Subcritical Water ◽  
Water Conditions

scholarly journals New fast “One-pot” Technique for the Production of Glycyrrhetinic Acid from the Roots of licorice (Glycyrrhiza glabra)

2018 ◽  
Vol 13 (7) ◽  
pp. 1934578X1801300
Author(s):  
Anna V. Lekar ◽  
Sergey N. Borisenko ◽  
Elena V. Vetrova ◽  
Elena V. Maksimenko ◽  
Salima S. Khizrieva ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Subcritical Water ◽  
Low Cost ◽  
Glycyrrhetinic Acid ◽  
Glycyrrhiza Glabra ◽  
One Pot ◽  
Glycyrrhiza Glabra L ◽  
The One ◽  
Toxic Organic Solvents ◽  
Pot Technique

The aim of this work was to develop and study a fast “one-pot” procedure for the production of glycyrrhetinic acid (GLA) from the roots of licorice ( Glycyrrhiza glabra L.) using subcritical water (SBW). Technique requires no use expensive and toxic organic solvents. For the first time the new method was used for the production of glycyrrhetinic acid (aglycone of glycyrrhizic acid) by “one-pot” technique. HPLC was used to determine the quantitative compositions of the obtained products. It has been shown that variation of only one parameter of the process (temperature) allows alteration of composition of the products obtained by new “one-pot” technique. The “one-pot” procedure developed for the production of GLA in SBW is faster (12 folds) than conventional methods that use expensive and toxic organic solvents. The proposed procedure has the excellent potential for the future development of the fast and low cost technologies for the production of GLA and its derivatives in the pharmaceutical, food and cosmetic industries.

scholarly journals Life cycle assessment of biodiesel production from algal bio-crude oils extracted under subcritical water conditions

2014 ◽  
Vol 170 ◽  
pp. 454-461 ◽  
Author(s):  
Sundaravadivelnathan Ponnusamy ◽  
Harvind Kumar Reddy ◽  
Tapaswy Muppaneni ◽  
Cara Meghan Downes ◽  
Shuguang Deng
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Subcritical Water ◽  
Biodiesel Production ◽  
Crude Oils ◽  
Water Conditions

Hydrolysis kinetics of sunflower oil under subcritical water conditions

2009 ◽  
Vol 87 (6) ◽  
pp. 867-873 ◽  
Author(s):  
R. Alenezi ◽  
G.A. Leeke ◽  
R.C.D. Santos ◽  
A.R. Khan
Keyword(s):  
Sunflower Oil ◽  
Subcritical Water ◽  
Hydrolysis Kinetics ◽  
Water Conditions ◽  
Kinetics Of

Glaser Coupling Reaction without Organic Solvents and Bases under Near-critical Water Conditions

2010 ◽  
Vol 22 (2) ◽  
pp. 219-221 ◽  
Author(s):  
Pin-Hua Li ◽  
Jin-Can Yan ◽  
Min Wang ◽  
Lei Wang
Keyword(s):  
Organic Solvents ◽  
Coupling Reaction ◽  
Water Conditions ◽  
Glaser Coupling

Bio oil production from microalgae via hydrothermal liquefaction technology under subcritical water conditions

2018 ◽  
Vol 153 ◽  
pp. 108-117 ◽  
Author(s):  
P. Kiran Kumar ◽  
S. Vijaya Krishna ◽  
Kavita Verma ◽  
K. Pooja ◽  
D. Bhagawan ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Oil Production ◽  
Hydrothermal Liquefaction ◽  
Bio Oil ◽  
Water Conditions

scholarly journals Stability and Extraction of Vanillin and Coumarin under Subcritical Water Conditions

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1061 ◽  
Author(s):  
Ninad Doctor ◽  
Grayson Parker ◽  
Katie Vang ◽  
Melanie Smith ◽  
Berkant Kayan ◽  
...  
Keyword(s):  
Natural Products ◽  
Chromatographic Separation ◽  
Extraction Efficiency ◽  
Subcritical Water ◽  
Stability Study ◽  
Water Conditions ◽  
Study Support ◽  
Partial Degradation ◽  
The Stability ◽  
Increasing Temperature

In order to facilitate the development of the green subcritical water chromatography technique for vanillin and coumarin, the stability of the compounds under subcritical water conditions was investigated in this work. In addition, their extraction from natural products was also studied. The stability experiments were carried out by heating the mixtures of vanillin and water or coumarin and water at temperatures ranging from 100 °C to 250 °C, while subcritical water extractions (SBWE) of both analytes from vanilla beans and whole tonka beans were conducted at 100 °C to 200 °C. Analyte quantification for both stability and extraction studies was carried out by HPLC. After heating for 60 min, vanillin was found to be stable in water at temperatures up to 250 °C. While coumarin is also stable at lower temperatures such as 100 °C and 150 °C, it undergoes partial degradation after heating for 60 min at 200 °C and higher. The results of this stability study support green subcritical water chromatographic separation and extraction of vanillin and coumarin at temperatures up to 150 °C. The SBWE results revealed that the extraction efficiency of both analytes from vanilla beans and tonka beans is significantly improved with increasing temperature.

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