Geographic origin characterization of Brazilian green coffee beans via untargeted metabolomics.

Coffee is a widely popular beverage worldwide, known for its distinct sensory properties which are greatly affected by geographical origin. Herein, we performed an untargeted metabolomic evaluation of green coffee beans (n = 40) from four different regions in Brazil: Cerrado Mineiro, Sul de Minas, Caparaó, and Mogiana Paulista; by using UHPLC-HRMS (ultra-high performance liquid chromatography coupled with high-resolution mass spectrometry). The most significant metabolites responsible for coffee characterization were theobromine, zeatin, phenylacetaldehyde, 2-acetyl-1-pyrroline, chlorogenic acids, ferulic acid, p-coumaric acid, abscisic acid, and jasmonic acid.

Accelerated synthesis of phthalimide derivatives: Intrinsic reactivity of diamines towards phthalic anhydride evaluated by paper spray ionization mass spectrometry.

Rationale: Paper spray (PS) is a simple and innovative ambient ionization technique for mass spectrometry (MS) analysis. Under PS-MS conditions, chemical reactions, which usually occur slowly on a bulk scale, are accelerated. Moreover, the formation of products and transient species can be easily monitored.

On-Surface Alcohol Oxidation Monitored by Paper Spray Mass Spectrometry: The Role of Ruthenium as Catalyst.

Paper spray ionization mass spectrometry (PS-MS) is employed herein as a convenient platform to investigate an on-surface catalytic process, that is, the oxidation of alcohols induced by ruthenium salts. The tag-charged benzyl alcohol (/ 166), used as a suitable prototype starting substrate, is quickly oxidized by -butyl hydroperoxide (TBHP) in an on-surface process catalyzed by ruthenium trichloride (RuCl). The PS(+)-MS revealed the formation of products from the oxidation of alcohol .