title: Polymeric inverse micelles as selective peptide extraction agents for MALDI-MS analysis.
abstract: Analyses of peptides in complex mixtures are significant challenges in proteomics applications. Here, we report an amphiphilic polymer-based nanoassembly that is capable of selectively extracting peptides, on the basis of their isoelectric points, into an immiscible organic phase from an aqueous solution. The isoelectric point (pI) cutoff in these extractions depends on the pH of the aqueous solution, and thus, sequential fractionation of peptide mixtures based on pI can be accomplished by varying the pH of the aqueous solution. Additionally, we observe an unexpected enhancement in the MALDI-MS signal for extracted peptides ionized in the presence of the polymer, which allows us to obtain reproducible ion signals for some peptides at concentrations as low as 10 pM.
authors: Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors: Marianny Y
authors: MY
authors: Combariza
authors: Elamprakash N
authors: EN
authors: Savariar
authors: Dharma Rao
authors: DR
authors: Vutukuri
authors: S
authors: S
authors: Thayumanavan
authors: Richard W
authors: RW
authors: Vachet
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006863:Hydrogen-Ion Concentration; D007526:Isoelectric Point; D008823:Micelles; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009211:Myoglobin / Q000032:analysis / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D010455:Peptides / Q000032:analysis* / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014867:Water / Q000737:chemistry
chemical_list: D008823:Micelles; D009211:Myoglobin; D009930:Organic Chemicals; D010455:Peptides; D011108:Polymers; D014867:Water