scholarly journals Lipid A fractions analyzed by a technique involving thin-layer chromatography and enzyme-linked immunosorbent assay

1984 ◽  
Vol 138 (2) ◽  
pp. 333-337 ◽  
Author(s):  
Inger MATTSBY-BALTZER ◽  
Carl R. ALVING
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Immunosorbent Assay ◽  
Lipid A ◽  
Enzyme Linked Immunosorbent Assay ◽  
Layer Chromatography

Enzyme-Linked Immunosorbent Assay for Deoxynivalenol in Corn and Wheat

1988 ◽  
Vol 71 (5) ◽  
pp. 945-949 ◽  
Author(s):  
Yi-Chun XU ◽  
Guang S Zhang ◽  
Fun S Chu
Keyword(s):  
Acetic Anhydride ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Immunosorbent Assay ◽  
Phosphate Buffer ◽  
Indirect Elisa ◽  
Enzyme Linked Immunosorbent Assay ◽  
Detection Level ◽  
Direct Elisa ◽  
Layer Chromatography

Abstract The availability of antibody against deoxynivalenol (DON) triacetate (Tri-Ac-DON) has enabled development of a direct enzyme-linked immunosorbent assay (ELISA) and an indirect ELISA for DON in corn and wheat. In both assays, DON is extracted from the sample with acetonitrile- water, reacted with acetic anhydride to form Tri- Ac-DON, and diluted in phosphate buffer for analysis. Direct ELISA was found to be the more sensitive procedure. Fewer interferences are evidenced, and the assay is less time consuming than is indirect ELISA. For direct ELISA, recovery of 10-1000 ppb DON added to corn and wheat was 100% (SD 15, CV 15%) and 102.1% (SD 12.2, CV 11.9%), respectively. For indirect ELISA, overall recovery of 10- 1000 ppb DON added to wheat was 121.5% (SD 39.5, CV 32.5%); in the higher concentration range (500-1000 ppb), recovery was 105% (SD 18, CV 17%). The minimal detection level for DON was around 10 ppb. Analysis of 7 naturally contaminated samples for DON showed that the ELISA results agreed well with those obtained by radioimmunoassay and thin-layer chromatography.

scholarly journals Co-occurrence of Aflatoxins, Ochratoxin A, Fumonisins, and Zearalenone in Cereals and Feed, Determined by Competitive Direct Enzyme-Linked Immunosorbent Assay and Thin-Layer Chromatography

2009 ◽  
Vol 60 (4) ◽  
pp. 427-434 ◽  
Author(s):  
Maja Klarić ◽  
Zdenka Cvetnić ◽  
Stjepan Pepeljnjak ◽  
Ivan Kosalec
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Ochratoxin A ◽  
Immunosorbent Assay ◽  
Limit Of Detection ◽  
Permissible Limit ◽  
Enzyme Linked Immunosorbent Assay ◽  
Wide Range ◽  
Food And Feed ◽  
Layer Chromatography

Co-occurrence of Aflatoxins, Ochratoxin A, Fumonisins, and Zearalenone in Cereals and Feed, Determined by Competitive Direct Enzyme-Linked Immunosorbent Assay and Thin-Layer ChromatographyAspergillus, Penicillium, andFusariumspecies frequently contaminate crops. For this reason mycotoxins such as aflatoxins (AFs), ochratoxin A (OTA), fumonisins (FBs), and zearalenone (ZEA) are found in food and feed in a wide range of concentrations, depending on environmental and storage conditions. Consumption of mycotoxin-contaminated food and feed has been associated with acute and chronic poisoning and carcinoma. The aim of this study was to determine the incidence and co-occurrence of AFs (B1+B2+G1+G2), OTA, FBs (B1+B2+B3), and ZEA in 37 samples of cereals and feed randomly collected in 2007 from households of an endemic nephropathy (EN) area in Croatia. The mycotoxins were determined using the competitive direct ELISA test (CD-ELISA) in combination with thin-layer chromatography (TLC). The most frequent mycotoxin was ZEA (92%, mean 318.3 μg kg-1), followed by FBs (27%, 3690 μg kg-1), AFs (24.3%, 4.6 μg kg-1), and OTA (16.2%, 9.8 μg kg-1). Levels of AFs, ZEA, and FBs detected by CD-ELISA significantly correlated with the TLC results. However, only one OTA-positive sample was confirmed by TLC due to its high limit of detection. The levels of these mycotoxins were below the permissible limit for animal feed. Twenty-nine percent of cereals were contaminated with FBs, OTA, or ZEA in mass fractions above the permissible limit for humans. Co-occurrence of two toxins varied between 4.2% and 54% and of three between 4.2% and 7.6%. Prolonged co-exposure to AFs, OTA, FBs, and ZEA might increase the risk of various chronic diseases.

Comparison of Thin-Layer Chromatography and an Enzyme-Linked Immunosorbent Assay for Detection and Quantification of Deoxynivalenol in Corn and Wheat†

1996 ◽  
Vol 59 (4) ◽  
pp. 438-440 ◽  
Author(s):  
CHARLENE E. WOLF-HALL ◽  
LLOYD B. BULLERMAN
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Ease Of Use ◽  
Detection Methods ◽  
Enzyme Linked Immunosorbent Assay ◽  
Elisa Method ◽  
Recovery Rates ◽  
Ground Wheat ◽  
Layer Chromatography ◽  
Detection And Quantification

The trichothecene, deoxynivalenol (DON), is a common mycotoxin found in wheat and corn. Detection methods for DON have limitations in accuracy, sensitivity, ease of use, and turn-around time. Two methods, thin-layer chromatography (TLC) and an enzyme-linked immunosorbant assay (ELISA) for DON detection and quantification were compared. The methods varied considerably in the amounts of DON detected in 51 different grain samples, with the ELISA method showing higher concentrations than the TLC method. Much of the unaccounted-for DON may have been lost during sample preparation for the TLC method. Recovery rates for the TLC method at DON levels of 1 and 5 ppm were 46% and 25% in corn grits and 32% and 26% in ground wheat respectively. Recovery rates for the ELISA method at 1 and 5 ppm levels were both 96% in corn grits and respectively 83% and 69% in ground wheat. The ELISA method was much faster and less laborious than the TLC method and did not use organic solvents, which are required in the TLC method.

Thin-Layer Chromatography

1965 ◽  
Author(s):  
H. R. Bolliger ◽  
M. Brenner ◽  
H. Gänshirt ◽  
Helmut K. Mangold ◽  
H. Seiler ◽  
...  
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Layer Chromatography

THE LESS-POLAR METABOLITES PRODUCED BY INCUBATION OF TESTOSTERONE-4-14C WITH RAT AND BOVINE BRAIN

1969 ◽  
Vol 61 (4) ◽  
pp. 641-648 ◽  
Author(s):  
Leon J. Sholiton ◽  
Emile E. Werk
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Paper Chromatography ◽  
Specific Activity ◽  
Bovine Brain ◽  
Polar Fraction ◽  
End Products ◽  
Polar Metabolites ◽  
Layer Chromatography ◽  
Constant Specific Activity

ABSTRACT Rat and bovine brain have been incubated with testosterone-4-14C under standard conditions. With use of paper chromatography, the extracted metabolites were noted to fall into less-polar, iso-polar, and more polar fractions. The components of the less-polar fraction were separated by acetylation and thin-layer chromatography and the major end-products identified by recrystallization to constant specific activity or constant 3H/14C ratios. Androst-4-enedione and 5α-dihydrotestosterone were formed consistently under the conditions utilized. Trace amounts of other less-polar metabolites were noted occasionally.

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