[Todos] SEMINARIO PROXIMO

[Fernando V. Molina]

Lunes 24 de setiembre - 14 hs

Aula de Seminarios INQUIMAE-DQIAQF (3º piso Pab. II)


Prof. Marcos N. Eberlin
Laboratório ThoMSon de Espectrometria de Massas
Instituto de Química - Universidade Estadual de Campinas, SP, Brasil



"ESI-MS and MALDI-MS Fingerprinting: 
Classification, Adulteration and Aging of Food, 
Cosmetics and Medicinal Products "


Abstract:
With the advent of the very soft ESI and MALDI 
techniques, mass spectrometry is now able to 
provide, for mixture analysis, nearly a single 
ion for each (semi)polar analyte. This ‘one ion: 
one component’ matching in addition to the high 
speed, sensitivity and selectivity that only MS 
can offer makes ESI-MS and MALDI-MS very powerful 
techniques for the typification of chemical 
mixtures of different compositions based on 
natutal chemotaxomonic markers. MALDI-MS peptide 
mass fingerprintings for protein analysis in 
proteomics and direct infusion ESI-MS 
fingerprintings of crude oils in petroleomics 
have already been used widely for reliable 
characterization. But this successful approach 
could also be extended to many other areas. In 
this talk, we will show examples of the use of 
MALDI-MS and direct infusion ESI-MS 
fingerprintings for the classification, 
adulteration and aging of honey, propolis, plant 
extracts, fruit juices, natural versus transgenic 
beans, whisky, wine, beer, brazilian cachaça 
(versus rum), phyto-therapeutic products, coffee, 
snake venoms, perfumes, vegetable oils, cosmetic 
oils, olive oil, chocolates, gasoline, biodiesel, 
and meats in general. The use of a technique 
recently developed in our laboratory, that is 
desorption sonic spray ionization (DeSSI), for 
‘chromatography-free’, ‘sample preparation-free’ 
and ‘high voltage-free’ ambient mass spectrometry 
fingerprintings will also be illustrated.
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