Skip to main content

Pulse Thermal Lens Spectrometry of beta-Carotene in Flow Systems at Atmospheric- and High-Pressure Conditions

Buy Article:

$29.00 plus tax (Refund Policy)

Abstract:

A dual-laser thermal lens spectrometer with a pulse pump-probe coaxial configuration was constructed, optimized, and used to study the influence of flow rate, cell design, nature of the solvent, photostability of the chromophore, and pressure up to 80 atm. beta-carotene solutions in 2-propanol, n-hexane, and carbon tetrachloride were pumped through a quartz cell (10 mm pathlength, 30 mu L internal volume) and a stainless steel cell (50 mm pathlength, 350 mu L internal volume). With beta-carotene, flow produces a relative thermal lens spectrometry (TLS) signal magnitude increase owing to replacement of photobleached analyte in the beam region. The effects of pressure in the different solvents are compared and discussed; the relative TLS signal magnitude decreased when pressure increased, but less in carbon tetrachloride than in the other solvents. Limit of detection for beta-carotene in carbon tetrachloride at 0.4 mL min-1 and 1 atm were 2 X 10-5 absorbance units.

Keywords: THERMAL LENS SPECTROMETRY FLOW INJECTION PHOTOINDUCED REACTIONS HIGH PRESSURE BETA-CAROTENE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702981942889

Publication date: November 1, 1998

More about this publication?
sas/sas/1998/00000052/00000011/art00014
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more