Multidetection

Idris, O.H.M. Williams, P. A. Phillips, G.O. (1998). Characterization of gum from Acacia Senegal trees of different age and location using multidetection gel permeation chromatography. Food Flydrocolloids, Vol. 12, No. 4, (October 1998), pp. 379-388, ISSN 0268-005X. 

The best way then to characterize the pectins is the steric exclusion chromatography equipped with a multidetection and particularly a light scattering detector [13]. 

J. Toft, Tutorial Evolutionary rank analysis applied to multidetectional chromatographic structures. Chemom. Intell. Lab. Syst., 29 (1995) 189-212. 

Tinland, B., Mazet, J., and Rinaudo, M., Characterization of water soluble polymers by multidetection size-exclusion chromatography, Makromol. Chem., Rapid Comm., 2, 69, 1988. 

Compatibility with a wide variety of sensitive and specific detectors multidetection... 

Afghan, B.K. and Wilkinson, R.J. (1981 ) Method for determination of Polynuclear Aromatic Hydrocarbons in Environmental Samples HPLG-multidetection system. Environment Canada, Manuscript 20-AMD 3-81 -BKA. 

Heuser SG, Scudmore KA. 1969. Determination of fumigant residues in cereals and other foodstuffs A multidetection scheme for gas chromatography of solvent extract. J Sci Food Agric 20 566-572. 

Shalaby, A.R. (1995). Multidetection, semiquantitative method for determining biogenic-amines in foods. Food Chem., 52, 367. 

Depending on their sensing ability, flow-through sensors can be classified into single-parameter and multi-parameter according to whether they can sense one or more analytes on passage of each sample. Multideterminations usually rely on the use of an instrument e.g. a diode array spectrophotometer) for virtually simultaneous multidetection e.g. [20]). 

A. Guzman-Vazquez de Prada, N. Pena, C. Parrado, A.J. Reviejo and J.M. Pingarron, Amperometric multidetection with composite enzyme electrodes, Talanta, 62(5) (2003) 896-903. 

The processing of several hundreds of samples per day using a multidetection system means the acquisition of more than a thousand chromatograms, the evaluation of which by the chemist would require substantial time and effort. Software that is able to discriminate between good and bad library components without human intervention is desirable in order to speed up the process of quality control. Some software of this type has been developed and is commercially available (76,77) or, alternatively. 

CHROM software. It is also possible to use molar mass sensitive detectors in this setup to get independent of calibrations or assumptions for the calculation of molar masses for copolymers with unknown structures. Multidetection analysis for independent copolymer composition calculations (S) and 2D segment distributions are already fully implemented in the PSS 2D-CHROM software package. 

More attention should be paid to the needs of the residue analyst working at the bench. Multidetection analytical methods are an enormous gain, but we need to beware of constantly adding new pesticides or breakdown products to an already-existing multidetection scheme. To do this will eventually make confirmation of identity an impossible job. For... 

A difficulty with multidetection SEC is that downstream chromatograms are shifted (and eventually distorted) with respect to the first-emerging chromatogram. This is a consequence of the interdetector capillaries and the (downstream) detector cell volumes. Such corrections are outside the scope of the present article. 

The aim of multidetection, especially LS/DRI coupling, is to find a useful calibration curve directly from the sample data and without external information from standards. A crude calibration curve is obtained by plotting, on a semilogarithmic scale, the instantaneous weight average M i values for each data point at elution volume Vi. At this point, correction for BB is rarely... 

Baran, H. and Schwedt, G. Identification of degradation products from epinephrine (adrenaline) in infusion solutions by HPLC and multidetection. Pharmazie. 48 273—275, 1993. 

As rightly pointed out recently by Luque de Castro and Valcarcel [1044], the term simultaneous is not cearly defined in FIA because it has been indiscrimanately used to describe different alternatives. Hence, in their paper, they attempted to establish the difference between multidetection and multidetermination, and the sequential and simultaneous variants of each of these, arriving at the following definitions ... 

Figure 4.52. FIA manifold designs for sequential multidetection employing a single injection position, (a) Splitting of the sample into a number of subplugs, which are guided through individual reaction coils and finally routed to a common, single detector, (b) Use of multiple detectors located in series, the response from each of which is fed to a microcomputer, (c) Use of a closed-loop system where the injected sample is recycled around a number of times in a loop, which includes the detector, until a constant signal is emitted, whereupon the sample is directed to waste.

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