Characterization of Groundwater Contaminants at Elmira, Ontario, by Thermal Desorption, Solvent Extraction GC-MS and HPLC

1990 ◽  
Vol 25 (3) ◽  
pp. 275-292 ◽  
Author(s):  
S. Lesage ◽  
J.K. Ritch ◽  
E.J. Treciokas
Keyword(s):  
Solvent Extraction ◽  
Thermal Desorption ◽  
Array Detector ◽  
Groundwater Contaminants ◽  
Ms Analysis ◽  
Solvent Extraction Method ◽  
Groundwater Samples ◽  
On Line ◽  
Conventional Solvent Extraction

Abstract Contaminated groundwater samples were characterized using on-line thermal desorption GC-MS analysis. The results were compared with conventional solvent extraction method followed by GC-MS analysis. Thermal desorption gave similar results for most compounds and was found to be superior for the analysis of water-miscible compounds. HPLC with a diode-array detector was used to measure phenol in the presence of large quantities of aniline.

Note: A rapid method for the determination of lipids an fatty acids in bread by gas chromatography / Nota: Método rápido para la determinación de lípidos y ácidos grasos en pan mediante cromatografía de gases

1998 ◽  
Vol 4 (3) ◽  
pp. 207-210
Author(s):  
Y.A. Sultanovitch ◽  
O. Philipp ◽  
M. Schmelewa ◽  
H.D. Isengard
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Solvent Extraction ◽  
Analytical Method ◽  
Extraction Method ◽  
Conversion Factor ◽  
High Sensitivity ◽  
Solvent Extraction Method ◽  
Conventional Solvent Extraction

A new simple and fast analytical method was developed to characterize the content of lipids and fatty acids in bread. First, fatty acids were determined by gas chromatography and then the content of lipids was calculated by using a conversion factor. This method gave very accurate results; it was three times faster than the conventional solvent extraction method and its consumption of solvent was much lower. The high sensitivity allowed the distribution of lipids in bread to be determined.

scholarly journals Continuous Monitoring of Resin Content in Prepreg Unidirectional Tapes by Beta-Ray Method

2002 ◽  
Vol 11 (1) ◽  
pp. 096369350201100 ◽  
Author(s):  
Y.D. Huang ◽  
L. Liu ◽  
Y.F. Sun ◽  
J.H. Qiu ◽  
N. Nakayama ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Method ◽  
Continuous Monitoring ◽  
Resin Content ◽  
Ray Method ◽  
Impregnation Process ◽  
Monitoring Technique ◽  
Solvent Extraction Method ◽  
Conventional Solvent Extraction ◽  
Calibration Relations

A beta-ray monitoring technique has been developed to measure the resin content during the manufacture of prepreg unidirectional tapes by solution impregnation process. A series of calibration relations have been obtained for aramid, carbon and glass fibres reinforced epoxy prepreg tapes, and good agreements with resin content have been shown by the beta-ray system and conventional solvent extraction method. Moreover, the effect of the variation of the fibre areal weight on measuring accuracy has been analysed.

Extraction and Characterization of 2-Isopropenyl-1-methoxy-7, 7-dimethyl-4, 9-imidazo-5-hydroxy pyrimidine called Alchorneinol from root bark of Alchornea hirtella used for the treatment toothache, and diarrhoea is Sierra Leone

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Lahai Koroma ◽  
L. M. Kamara ◽  
Ronnie Freezer-Williams
Keyword(s):  
Mass Spectrum ◽  
Solvent Extraction ◽  
Sierra Leone ◽  
Extraction Method ◽  
Bark Extract ◽  
Root Bark ◽  
Solvent Extraction Method ◽  
Elemental Analyses ◽  
Fragmentation Patterns

A new compound LK001 identified as 2-Isopropenyl-1-methoxyl-7, 7-dimethyl-4, 9-imidazo-5-hydroxy pyrimidine and named Alchorneinol has been extracted from the root bark of Alchornea hirtella plant. It was isolated using solvent-solvent extraction method from the powdered root bark of A. hirtella. The white powdered compound was slightly soluble in water, ethanol chloroform and tested positive for unsaturation. The compound LK001 contained Carbon, Hydrogen, Oxygen, and Nitrogen during elemental analyses. It also tested positive for the presence Hydroxide group thus making it slightly different from the already reported drug Alchorneine. The fragmentation patterns proposed from the Mass spectrum for Sample LK001 and by McLafferty rule support a new compound named Alchorneinol in the root bark extract. Itis therefore one of the active compounds responsible for the treatment of pain, particularly tooth ache, as purgative, stomach-ache and to treat tiredness after intoxication in Sierra Leone.

scholarly journals Extraction of Carotenoids from Tomato Pomace via Water-Induced Hydrocolloidal Complexation

Biomolecules ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1019 ◽  
Author(s):  
Jayesree Nagarajan ◽  
Hang Pui Kay ◽  
Nagendra Prasad Krishnamurthy ◽  
Nagasundara Ramanan Ramakrishnan ◽  
Turki M. S. Aldawoud ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Antioxidant Capacity ◽  
Extraction Methods ◽  
Extraction Yield ◽  
Raw Material ◽  
Aqueous Environment ◽  
Tomato Pomace ◽  
Green Approach ◽  
Solvent Extraction Method ◽  
Conventional Solvent Extraction

Agro-industrial waste is a largely untapped natural resource of bioactive compounds including carotenoids and pectin. However, conventional solvent extraction involves the excessive use of organic solvents, costly equipment, and tedious operation. These limitations of conventional extraction methods could be prospectively overcome by the carotenoid–pectin hydrocolloidal complexation. The complexation of lycopene and pectin was efficiently promoted in an aqueous environment, resulting in the colloidal complexes that can be subsequently recovered by sedimentation or centrifugation. In this study, the potential of carotenoid–pectin complexation on tomato pomace containing carotenoids and pectin was evaluated. Tomato pomace is a rich source of lycopene, β-carotene as well as pectin, making it suitable as the raw material for the carotenoid extraction. The extraction of carotenoid and pectin from tomato pomace was optimized using response surface methodology. The maximum recovery was 9.43 mg carotenoid fractions/100 g tomato pomace, while the purity of carotenoid-rich fractions was 92%. The antioxidant capacity of carotenoids extracted from the complexation method was found to be higher than that from the solvent extraction method. Moreover, extraction yield and antioxidant capacity of carotenoid obtained from the carotenoid–pectin complexation were comparable to that from solvent extraction. The carotenoid–pectin complexation is a promising green approach to valorize agro by-products for the extraction of valuable carotenoids.

Preparation and Structural Characterization of a Needlelike Carbon from the Refined Coal Tar Pitch

2008 ◽  
Vol 368-372 ◽  
pp. 282-283 ◽  
Author(s):  
Xue Fei Zhao ◽  
Shi Quan Lai ◽  
Ya Ru Zhang ◽  
Shu Lin Liu ◽  
Li Juan Gao ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Method ◽  
Mixed Solvent ◽  
Coal Tar ◽  
Xrd Analysis ◽  
Coal Tar Pitch ◽  
Solvent Extraction Method ◽  
Graphite Structure ◽  
Diffraction Peaks

A refined coal tar pitch with softening point of 33oC was obtained by a mixed solvent extraction method. The pitch was carbonized at 500oC to get micrometer carbon material with needlelike structure. The carbonized produce was further calcined at 1500oC for 30h. The resultant product was characterized by SEM, OM, EDS and XRD. Experimental results indicated that a mixed solvent extraction method could effectively get rid of primary quinoline insoluble (QI). SEM and OM examinations showed that there were more than 70% fibrous structures and a small amount mosaic structures. The size of the fibrous structure was greater than 150μm in length and less than 30μm in width. The result of EDS exhibited that the material mainly consisted of carbon. XRD analysis revealed that there was a sharp diffraction peaks at 26.5oC, which was corresponded to the (002) plane of graphite structure.

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