Authentication and Quantitative Analysis on the Chemical Profile of Cassia Bark (Cortex Cinnamomi) by High-Pressure Liquid Chromatography

2005 ◽  
Vol 53 (7) ◽  
pp. 2424-2428 ◽  
Author(s):  
Zhen-Dan He ◽  
Chun-Feng Qiao ◽  
Quan-Bin Han ◽  
Chuen-Lung Cheng ◽  
Hong-Xi Xu ◽  
...  
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
High Pressure Liquid Chromatography ◽  
Chemical Profile

Quantitative Analysis of Photochemical Reactions Utilizing High Pressure Liquid Chromatography: Linear Polyenes Related to Vitamin A

1979 ◽  
Vol 2 (8) ◽  
pp. 1205-1218 ◽  
Author(s):  
Walter H. Waddell ◽  
Patricia M. Dawson ◽  
Daniel L. Hopkins ◽  
Karen L. Rach ◽  
Motokazu Uemura ◽  
...  
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
Vitamin A ◽  
High Pressure Liquid Chromatography ◽  
Photochemical Reactions ◽  
Linear Polyenes

scholarly journals Analysis and separation of natural and synthetic mixtures of uroporphyrins by high-pressure liquid chromatography

1982 ◽  
Vol 203 (2) ◽  
pp. 515-517 ◽  
Author(s):  
Anthony H. Jackson ◽  
K. R. Nagaraja Rao ◽  
Sydney G. Smith
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
High Pressure Liquid Chromatography ◽  
Methyl Esters ◽  
New Method ◽  
Preparative Isolation ◽  
Naturally Occurring ◽  
Natural And Synthetic

A new method for the quantitative analysis of mixtures of the methyl esters of uroporphyrins I and III was developed; this can be applied both to the analysis of naturally occurring uroporphyrins and also to their semi-preparative isolation.

Detection of Reactive Sulfur Molecules (S6, S7, S9, S∞) in Commercial Sulfur, in Sulfur Minerals, and in Sulfur Melts Slowly Cooled to 20 °C [1].

1988 ◽  
Vol 43 (5) ◽  
pp. 581-589 ◽  
Author(s):  
Ralf Steudel ◽  
Birger Holz
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
High Pressure Liquid Chromatography ◽  
Solid Solutions ◽  
Elemental Sulfur ◽  
Surface Composition ◽  
Pale Yellow ◽  
Gaseous Sulfur

Abstract Quantitative analysis by high-pressure liquid chromatography shows that all commercial samples of elemental sulfur besides S8 contain traces of S7 (up to 0.56%) and in some cases also S6, S9 , and polymeric sulfur (S∞). Pure S8 can be obtained by recrystallization from CS2 . Elemental sulfur minerals also quite often contain traces of S7 (up to 0.3%). Since neither irradiation by daylight at 20 °C nor heating to 90 °C for 41 days did convert α-S8 into S7 , the reactive sulfur molecules Sn (n≠8) are believed to origin from liquid or gaseous sulfur which are known to be complex equilibrium mixtures of many Sn species. Sulfur melts slowly cooled (within 0.6 to 145 h) from 122 to 20 °C in fact contain S7 (minimum 0.2%) and at cooling rates of <24 h also other non-S8 molecules. Solid solutions of S7 in α-S8 have also been prepared by cocrystallization of the compounds from CS2. In contrast to pure α-S8, these solid solutions are pale-yellow at 77 K, and the implications of these findings for the surface composition of Jupiter’s satellite Io and for the mechanical properties of “formed sulfur” (Prills, Rotoform, Slates, etc.) are discussed.

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