Determination of accessible bed volume of gels by short column filtration

1992 ◽  
Vol 20 (2) ◽  
pp. 116-118 ◽  
Author(s):  
O.P. Malhotra ◽  
Prakash Prabhakar ◽  
Arvind M. Kayastha
Keyword(s):  
Short Column

Determination of formaldehyde residue in cosmetics by short-column high performance liquid chromatography with mass spectrometric confirmation

2015 ◽  
Vol 7 (4) ◽  
pp. 1630-1634 ◽  
Author(s):  
Chunhua Lv ◽  
Jiannan Sun ◽  
Heyong Cheng
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Mass Spectrometric ◽  
Fast Method ◽  
Short Column

This work presents an ultra-fast method for the determination of formaldehyde by high performance liquid chromatographyviaa guard column with mass spectrometric confirmation.

scholarly journals Spectrophotometric Determination of the CuSO4 Soret Coefficient of a CuSO4-H2O Binary Solutions System

2010 ◽  
Vol 1 (2) ◽  
pp. 73-76
Author(s):  
Ijang Rohman ◽  
Djaka Sasmita ◽  
Iip Izul Falah
Keyword(s):  
Thermal Diffusion ◽  
Spectrophotometric Determination ◽  
Soret Coefficient ◽  
Binary Solutions ◽  
Short Column ◽  
Metal Plates ◽  
Different Temperatures

A spectrophotometric technique for the determination of the CuSO4 soret coefficient of a CuSO4-water binary solutions system is described. A short column of solutions is placed between horizontal metal plates that are held at different temperatures. The subsequent changes in composition due to thermal diffusion are followed by monitoring changes of transmittance near the end of the solutions column. In water, CuSO4 diffuses to the warm compartment of column. The soret coefficient of CuSO4 0.0254 molal in water agrees with the appropriate theory, i.e. 17.60x10-3 °C-1 on the average.

scholarly journals Determination of Individual Homologues and Total Content of Benzalkonium Chloride by Reversed-Phase High-Performance Liquid Chromatography Using a Short Butyl Column

2009 ◽  
Vol 92 (6) ◽  
pp. 1644-1651 ◽  
Author(s):  
Fangzhu Liu ◽  
Kang Ping Xiao ◽  
Abu M Rustum
Keyword(s):  
Benzalkonium Chloride ◽  
Mobile Phase ◽  
High Performance ◽  
Total Concentration ◽  
Total Content ◽  
Reversed Phase ◽  
Hplc Method ◽  
Raw Material ◽  
Short Column

Abstract Benzalkonium chloride (a mixture of alkylbenzyldimethylammonium chlorides that usually contains C-10, C-12, C-14, and C-16 homologues), commonly known as BKC, is used as a bacteriostatic agent in many household, food, and drug products. In this paper, we report a simple, rapid, robust, and stability-indicating reversed-phase HPLC method using a short butyl (C4) column for the simultaneous determination of each individual homologue content, as well as the total concentration of individual homologues in commercial bulk raw material batches of BKC samples. The chromatographic separation was performed on a 5 cm ACE C4 column with mobile phase consisting of water, acetonitrile, and potassium chloride. Even though using a short column can potentially cause some challenges to resolving certain critical pairs of peaks, we have successfully separated all of the analyte peaks (including those from stressed, degraded products) on a short column using an optimal mobile phase.

Liquid Chromatographic-Fluorometric Determination of Cinnamyl Alcohol in Perfumes, Colognes, and Toilet Waters

1988 ◽  
Vol 71 (4) ◽  
pp. 821-823
Author(s):  
Harris H Wisneski ◽  
Ronald L Yates ◽  
John A Wenninger
Keyword(s):  
Emission Intensity ◽  
Fluorescence Emission ◽  
Water Mixture ◽  
Cinnamyl Alcohol ◽  
Fluorometric Determination ◽  
Short Column ◽  
Fluorescence Emission Intensity ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for the determination of cinnamyl alcohol (3-phenyl-2-propen-l-ol) in fragrance compositions. The fragrance product is partially cleaned up by diluting the fragrance with a 95% ethanol-water mixture and passing it through a short column containing RP-8 packing. An aliquot of the effluent is then analyzed by LC using an RP-18 column interfaced to a spectrophotofluorometer equipped with double monochromators. The fluorescence emission intensity of the eluted cinnamyl alcohol is measured and compared with that of a standard to calculate the amount of cinnamyl alcohol present. Recoveries from fragrance products fortified with cinnamyl alcohol at levels ranging from 0.0020 to 0.060 mg/mL ranged from 85 to 105% with a mean of 94%. The lowest level of determination was 0.0005 mg/mL.

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