Journal of Chromatography Library, Vol. 72 by Achille Cappiello

By Achille Cappiello

The various LC-MS suggestions to be had this day have been built to fit particular analytical wishes and the appliance variety lined by means of every one is huge, yet nonetheless restricted. GC amenable compounds may be all analyzed with a unmarried GC-MS procedure while HPLC purposes demand particular LC-MS instrumental preparations. ESI, APCI, APPI, and EI are ionization concepts that may be mixed with diverse analyzers, in unmarried or tandem configuration, to create the final word procedure for a definite program. as soon as forthcoming LC-MS for a particular want, the quick technical evolution and the variegated advertisement provide can result in confusion within the strength user.The position of this booklet is to enlighten the state of the art of LC-MS evolution via a chain of contributions written via the folks that introduced significant, fresh recommendations within the box. each one bankruptcy will think about the novelties, the benefits and the prospective purposes coated by means of a specific technical answer. The booklet also will contain new analytical tools that may offer advantages utilizing the latest techniques in LC-MS plus a undeniable variety of key applications.- includes contributions from significant innovators within the box- Covers the newest advancements within the box of LC-MS- supplies a transparent define at the merits of varied suggestions and their functions

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1. Scheme of the Direct-EI interface. qxd 11/11/2006 30 12:47 PM Page 30 Chapter 3 evaporation must be prevented by thermally insulating the nebulizer and the connecting tubing from the source heat. Premature mobile-phase evaporation impairs the nebulizer’s ability to generate an aerosol and the consequent solute precipitation might obstruct the small tip orifice impeding the normal liquid passage. Once released by the nebulizer, the liquid is converted into small spray droplets that are directed toward a specific target surface in the ion source.

Pucci, R. Lazzaroni and P. Salvadori, Rapid Commun. , 11 (1997) 259–264. W. , Industrial Water Pollution Control, McGraw Hill, New York, NY, 1966, Chapter 6. E. Perri, F. Mazzotti, A. Raffaelli and G. Sindona, J. Mass. , 35 (2000) 1360–1361. E. Perri, A. Raffaelli and G. Sindona, J. Agric. , 47 (1999) 4156–4160. A. Raffaelli, A. Cuzzola, S. Pucci and P. Salvadori, 49th ASMS Conference on Mass Spectrometry and Allied Topics, Chicago, IL, USA, May 27–31, 2001, ThPN 348. A. Raffaelli, Unpublished results, presented at MASSA 2001 – IONISSEA NELLO SPAZIO, An International Symposium on Mass Spectrometry, Marina di Campo, Elba Island (LI), Italy, June 24–27, 2001, KN-5, Abstracts, p.

The quality of the experimental mass spectrum, at different flow rates, was measured as the degree of overlap (%) obtained when compared to the reference spectrum that is recorded in the Wiley electronic library. Only “pure” EI spectra were considered, so that CI data were discarded. The results are plotted in Fig. 5. Six nanograms of each compound were injected, using a 1:1 (v:v) mixture of water and acetonitrile. Decreasing the mobile-phase flow rate is clearly advantageous for the overall mass spectral quality and especially for caffeine, azinphos ethyl, and bisphenol A that give a fairly high response over the widest flow rate range.

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