The reciprocal iso-inhibition volume concept: A procedure for the evaluation in effect-directed analysis with thin-layer chromatography - using the thin-layer chromatography-luminescent bacteria assay as an example
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In: Journal of Chromatography A, Vol. 1519, 13.10.2017, p. 121-130.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - The reciprocal iso-inhibition volume concept
T2 - A procedure for the evaluation in effect-directed analysis with thin-layer chromatography - using the thin-layer chromatography-luminescent bacteria assay as an example
AU - Schulz, Wolfgang
AU - Weiss, Stefan C.
AU - Weber, Walter H.
AU - Winzenbacher, Rudi
PY - 2017/10/13
Y1 - 2017/10/13
N2 - In effect-directed analysis (EDA) with high-performance thin-layer chromatography (HPTLC), the effect is often detected using images. Thus, an approach to create inhibition chromatograms from these images was developed using the example of the HPTLC- bioluminescence inhibition test. A comparison between the cuvette test and the HPTLC test shows that the test on the plate is significantly more sensitive. To describe the strength of the effect, the EC50 value is determined from the dose-response relationship. However, the inhibiting compounds are generally unknown and thus their concentrations are also unknown. Therefore, instead of the concentration, the known application volumes are used. This enables the calculation of the application volume necessary to achieve 50% inhibition. Since the volume is inversely proportional to the concentration, the reciprocal value of the calculated volume is indicated and is referred to as the reciprocal iso-inhibition volume (RIV). Using this RIV-concept, it is now possible to compare inhibition bands within and between plates. The entire evaluation is described by the means of two samples from a contaminated site using the bioluminescence inhibition.
AB - In effect-directed analysis (EDA) with high-performance thin-layer chromatography (HPTLC), the effect is often detected using images. Thus, an approach to create inhibition chromatograms from these images was developed using the example of the HPTLC- bioluminescence inhibition test. A comparison between the cuvette test and the HPTLC test shows that the test on the plate is significantly more sensitive. To describe the strength of the effect, the EC50 value is determined from the dose-response relationship. However, the inhibiting compounds are generally unknown and thus their concentrations are also unknown. Therefore, instead of the concentration, the known application volumes are used. This enables the calculation of the application volume necessary to achieve 50% inhibition. Since the volume is inversely proportional to the concentration, the reciprocal value of the calculated volume is indicated and is referred to as the reciprocal iso-inhibition volume (RIV). Using this RIV-concept, it is now possible to compare inhibition bands within and between plates. The entire evaluation is described by the means of two samples from a contaminated site using the bioluminescence inhibition.
KW - Aliivibrio fischeri
KW - EDA
KW - Environmental analysis
KW - HPTLC
KW - HPTLC/AMD
KW - Chemistry
UR - http://www.scopus.com/inward/record.url?scp=85029713471&partnerID=8YFLogxK
U2 - 10.1016/j.chroma.2017.08.076
DO - 10.1016/j.chroma.2017.08.076
M3 - Journal articles
C2 - 28888680
AN - SCOPUS:85029713471
VL - 1519
SP - 121
EP - 130
JO - Journal of Chromatography A
JF - Journal of Chromatography A
SN - 0021-9673
ER -