+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Determination of bi phenyl and 8 bi phenols in microbial extracts by gas chromatography and thin layer chromatography

, : Determination of bi phenyl and 8 bi phenols in microbial extracts by gas chromatography and thin layer chromatography. Analytical Chemistry 50(6): 736-740

Thin-layer and gas chromatographic methods have been developed for the determination of the carcinogen biphenyl and 8 of its mono- or dihydroxylated phenolic analogues in microbiological media and homogenates of the fungus, Cunninghamella elegans. Biphenyl is analyzed by gas chromatography following n-heptane extraction of alkalinized systems. The biphenols are extracted at pH 6 with ethyl acetate and chromatographed as their heptafluorobutyrate derivatives. Using naphthalene and 1-naphthol as internal standards for biphenyl and the biphenols, respectively, recoveries of 88% or better were achieved with all but two of the compounds analyzed while SD were less than 5%. Six TLC systems were developed for separation and detection of the biphenyl compounds in microbial extracts. Chromogenic spray reagents are described which assist in distinguishing between biphenols with similar chromatographic mobilities.


Other references

Cox, James M., 2003: Chiropractic treatment table and method for spinal distraction. A chiropractic treatment table and method for treating a patient's spine for providing true longitudinal distraction alone or in combination with vertical flexion and extension, lateral flexion, and/or rotation. The treatment table includes a...

Dubousset, J., 2000: C-D Horizon A new Cotrel-Dubousset instrumentation. Spine 25(6 Suppl): 85S-98S, March 15

del-Moral-Martínez, I.; Arnó, J.; Escolà, A.; Sanz, R.; Masip-Vilalta, J.; Company-Messa, J.; Rosell-Polo, J.R., 2015: Georeferenced scanning system to estimate the leaf wall area in tree crops. This paper presents the use of a terrestrial light detection and ranging (LiDAR) system to scan the vegetation of tree crops to estimate the so-called pixelated leaf wall area (PLWA). Scanning rows laterally and considering only the half-canopy ve...

Schmidt, W.C., 1995: Around the world with Larix: an introduction. Notes are given on the various species of Larix, and their geographical distribution.

Wende I.; Grueneberger A., 1983: Pre operative and post operative controls in 2 comparable groups of stress incontinent women with various operative methods. Archives of Gynecology 235(1-4): 83-84

Eberl, A.; Huoponen, S.; Pahikkala, T.; Blom, M.; Arkkila, P.; Sipponen, T., 2017: Switching maintenance infliximab therapy to biosimilar infliximab in inflammatory bowel disease patients. Clinical use of biosimilar infliximab (CT-P13) in inflammatory bowel diseases (IBDs) is based on extrapolation of indication from clinical studies performed in rheumatological diseases. Only few data exist of behaviour of infliximab trough levels...

Honeyman B.D.; Leckie J.O., 1981: Model system studies of soil or sediment components competing for trace elements. Eos, Transactions, American Geophysical Union 62(45): 926

Sulek E.; Reule E., 1986: Results of studies on the influence of the work force on the quality of plant stocks and the extent of harvest losses in sugar beet production. Wissenschaftliche Zeitschrift Martin-Luther-Universitaet Halle-Wittenberg Mathematisch-Naturwissenschaftliche Reihe 35(4): 46-54

Stumm-Tegethoff, B.F., 1969: Formaldehyde-induced mutations in Drosophila melanogaster in dependence of the presence of acids. The mutagenic activity of various combinations of formaldehyde, formic acid, acetic acid and hydrochloric acid was investigated by a sex-linked lethal test. All combinations were mutagenic and showed a mutation pattern from which it is concluded t...

Synder, M.; Zwierzchowski, H., 1988: Significance of ultrasound studies in the diagnosis and treatment of rupture of the Achilles tendon. Beitrage Zur Orthopadie und Traumatologie 35(10): 500-502