Composition of matter of a population of multiply charged ions derived from polyatomic parent molecular species
AssigneeJohn B. Fenn
InventorsJohn Bennett Fenn, Chin-Kai Meng, Matthias Mann
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Abstract
This invention describes the production of mass spectra which contain a multiplicity of peaks. The component ions of these peaks, which are multiply charged, are formed by dispersing a solution containing an analyte into a bath gas as highly charged droplets. The analyte is generally a compound of high molecular weight and is of biochemical interest. The invention also describes methods for calculating the molecular weight of the analyte from the measured mass values of the highly charged ions.
Claims112
A composition of matter comprising a population of multiply charged polyatomic ions derived from a distinct polyatomic parent molecular species, all molecules of said distinct polyatomic parent molecular species having substantially the same molecular weight and chemical identity, the number of charges on each ion in said population of multiply charged polyatomic ions defining that ion's charge state number, said population of multiply charged polyatomic ions comprising a plurality of sub-populations of ions, all the ions of each of said sub-populations having the same charge state number, said same charge state number differing from the charge state numbers of the ions in the other sub-populations of said plurality of subpopulations, said plurality of sub-populations comprising one sub-population for each value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five.
A composition of matter comprising one or more populations of multiply charged polyatomic ions derived from a sample comprising at least one polyatomic parent molecular species, the number of charges on each ion defining said ion's charge state number, said population of multiply charged polyatomic ions formed from said at least one polyatomic parent molecular species comprising a plurality of sub-populations, the ions of each sub-population having the same charge state number, said charge state number differing by one from the next largest and the next smallest values of charge state number found in the other sub-populations of said plurality, the ions of each of said sub-populations having a value of said charge state number that is not less than five, said composition of matter being formed by:
- dispersing a solution of said sample containing said at least one polyatomic parent molecular species into a bath gas as charged droplets, said dispersing taking place in the presence of an electric field;
- and
- allowing the solvent of said solution to evaporate from said charged droplets until at least some molecules of said polyatomic parent molecular species become dispersed in said bath gas as said multiply charged polyatomic ions.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining the ion's charge state number, each of said populations of polyatomic ions comprising a plurality of sub-populations, each of said plurality of sub-populations being comprised of ions formed from one of said distinct polyatomic parent molecular species and having the same charge state number, there being at least one of said populations of multiply charged polyatomic ions that comprises one of said sub-populations for each value of charge state number beginning with a smallest value of three and extending to a largest value not less than five.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining its charge state number, each of said populations of multiply charged polyatomic ions comprising ions formed from one of said distinct polyatomic molecular species and being comprised of a plurality of sub-populations, the ions of each of said sub-populations having the same charge state number, there being one of said sub-populations for each value of said charge state number beginning with a smallest value not less than three and extending to a largest value not less than five.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining the ion's charge state number, each of said populations of multiply charged polyatomic ions comprising ions formed from one of said distinct polyatomic parent molecular species in said sampler at least one of said populations of multiply charged polyatomic ions being comprised of a plurality of sub-populations, the ions of each of said sub-populations having the same value of charge state number, that value being different from the values of charge state number in all the other sub-populations of ions in said plurality of sub-populations, the smallest value of charge state number of the ions in said plurality of sub-populations being not less than three, said composition of matter being formed by:
- dispersing a solution containing said one or more distinct polyatomic parent molecular species into a bath gas as charged droplets, said dispersing taking place in the presence of an electric field.
- allowing the solvent of said solution to evaporate from said charged droplets until at least some molecules of said distinct polyatomic parent molecular species become dispersed in said bath gas as said multiply charged ions.
A composition of matter comprising one or more populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining the ion's charge state number, each of said populations of multiply charged polyatomic ions comprising ions formed from one of said one or more distinct polyatomic parent molecular species, at least one of said populations of ions comprising a plurality of sub-populations of ions, all the ions in each sub-population having the same charge state number, said at least one of said populations comprising one such sub-population for each possible value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five, said composition of matter being useful in the determination of a value of molecular weight for one or more of said distinct polyatomic parent molecular species, said determination of molecular weight being achieved by means of a mass analysis of ions from said one or more populations of ions and a calculation of the molecular weight values of said one or more polyatomic parent molecular species from the values of mass/charge (m/z) obtained by said mass analysis for the ions in said one or more populations of polyatomic ions.
The composition of matter comprising one or more populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining the ion's charge state number, each of said populations comprising ions formed from one of said one or more distinct polyatomic parent molecular species, at least one of said populations of multiply charged polyatomic ions comprising a plurality of sub-populations of ions, all the ions in each sub-population having the same charge state number, said same charge state number differing from the charge state numbers of the ion in the other sub-populations of said population, said charge state number having a value of at least five for all the ions in said at least one of said populations of multiply charged polyatomic ions, said composition of matter being useful for determining the molecular weight of one or more of said distinct polyatomic parent molecular species, said determination of the molecular weight being achieved by a mass analysis of the ions in said one or more populations of multiply charged polyatomic ions together with a calculation of the said molecular weight of said one or more polyatomic parent molecular species from the values of mass/charge (m/z) obtained by mass analysis of ions in said one or more populations of multiply charged polyatomic ions.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions generated from a sample comprising one or more distinct polyatomic parent molecular species, the number of charges on each ion defining the ion's charge state number, each of said multiply charged polyatomic ions in any one of said one or more distinct populations having been formed from one of said distinct polyatomic parent molecular species in said sample, at least one of said distinct populations of multiply charged polyatomic ions comprising a plurality of sub-populations of ions, all the ions in each sub-population of said plurality of sub-populations having the same charge state number, said same charge state number differing from the charge state numbers of the ions in the other sub-populations of said plurality of sub-populations, said plurality of sub-populations comprising one such sub-population for each possible value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five, said composition of matter being formed by:
- dispersing a solution containing said polyatomic parent molecular species into a bath gas as charged droplets, said dispersing taking place in the presence of an electric field;
- allowing the solvent of said solution to evaporate from said charged droplets until at least some molecules of said distinct polyatomic parent molecular species become dispersed in said bath gas as said multiply charged polyatomic ions;
- said composition of matter having the property that the molecular weight of each of said distinct polyatomic parent molecular species in said sample can be calculated from the mass/charge (m/z) values of the multiply charged polyatomic ions produced from that species.
A composition of matter that by mass analysis of its component ions is found to comprise one or more distinct populations of multiply charged polyatomic ions, the number of charges on each ion defining the ion's charge state number, each of said distinct populations of multiply charged polyatomic ions comprising ions having been formed from a polyatomic parent molecular species, at least one of said distinct populations of multiply charged polyatomic ions comprising a plurality of sub-populations of ions, all the ions in each sub-population having the same charge state number, said charge state number differing from the charge state number of the other sub-populations in said plurality of sub-populations, said plurality of sub-populations comprising one such sub-population for each possible value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five, said composition of matter being formed by:
- dispersing a solution containing one or more polyatomic molecular species into a bath gas as charged droplets, said dispersing taking place in the presence of an electric field;
- allowing the solvent of said solution to evaporate from said charged droplets until at least some molecules of said polyatomic parent molecular species become dispersed in said bath gas as said multiply charged polyatomic ions;
- said mass analysis being carried out on a portion of said multiply charged polyatomic ions in said bath gas that is introduced into a vacuum system containing a mass analyzer.
A composition of matter derived from a sample comprising one or more distinct polyatomic parent molecular species, all molecules of each of said distinct polyatomic parent molecular species having substantially the same molecular weight and chemical identity, said composition of matter comprising one or more distinct populations of polyatomic ions, at least one of said distinct populations of ions comprising multiply charged ions formed from one of said one or more distinct polyatomic parent molecular species in said sample, the number of charges on each ion defining the charge state number of that ion, each of said populations of multiply charged ions having the property that when its ions are mass analyzed they give rise to a mass spectrum comprising a multiplicity of peaks, said multiplicity of peaks comprising at least one coherent sequence of peaks, the ions of each peak in said coherent sequence having the same charge state number, said charge state number being greater thorn unity and differing by one unit from the charge state numbers of the ions of each immediately adjacent peak in said coherent sequence, said coherent sequence of peaks comprising one peak for each different value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions, each of said multiply charged polyatomic ions in said distinct populations being characterized by the symbol xi, the numerical value of xi being the m/z value of said one of said multiply charged ions such that xi=Mr/i+ma wherein Mr is the molecular weight of a distinct parent polyatomic molecular species from which all of said multiply charged polyatomic ions in said distinct population of multiply charged polyatomic ions are derived, i is an integer equal to the number of adduct charges attached to a molecule of said distinct polyatomic parent molecular species to form one of said multiply charged polyatomic ions, ma is the effective average mass (which can sometimes be negative) of each said adduct charge, each of said distinct populations of multiply charged polyatomic ions comprising a plurality of sub-populations, the ions of each sub-population having the same values for i, ma and Mr and therefore the same value of xi, said distinct populations of ions including at least one population in which all the ions have values of i greater than two.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions, each of said multiply charged polyatomic ions in said distinct populations being characterized by the symbol xi, the numerical value of xi being the m/z value of said one of said multiply charged ions such that xi=Mr/i+ma wherein Mr is the molecular weight of a distinct parent polyatomic molecular species from which all of said multiply charged polyatomic ions in said distinct population of multiply charged polyatomic ions are derived, i is an integer equal to the number of adduct charges attached to a molecule of said distinct parent polyatomic.sub.-- molecular species.sub.-- to form one of said multiply charged polyatomic ions, and ma is the effective average mass (which can sometimes be negative) of each said adduct charge, each of said distinct populations of multiply charged polyatomic ions comprising a plurality of sub-populations, the ions of each sub-population having the same values for i, ma and Mr and therefore the same value of xi, said distinct populations of multiply charged polyatomic ions including at least one population in which all the ions have values of i greater than three.
A composition of matter comprising one or more distinct populations of multiply charged polyatomic ions, each one of said multiply charged polyatomic ions in said one or more distinct populations being characterized by the symbol xi, the numerical value of xi being the m/z value of said multiply charged polyatomic ion such that xi=Mr/i+ma wherein Mr is the molecular weight of a distinct parent polyatomic molecular species from which all of said multiply charged polyatomic ions in one of said distinct populations of multiply charged polyatomic ions are derived, i is an integer equal to the number of individual adduct charges attached to a molecule of said distinct parent polyatomic molecular species to form one of said multiply charged polyatomic ions, ma is the effective average mass of said individual adduct charges (which can be negative), each of said distinct populations of ions comprising a plurality of sub-populations, the ions of each sub-population having the same values for i, ma and Mr and therefore the same value of xi, the value of i being at least three for every ion in at least one of said distinct populations of multiply charged polyatomic ions, said composition of matter being formed by:
- dispersing a solution containing said polyatomic parent molecular species into a bath gas as charged droplets, said dispersing taking place in the presence of an electric field, and
- allowing the solvent of said solution to evaporate from said charged droplets until at least some molecules of said parent polyatomic parent molecular species become dispersed in said bath gas as said multiply charged ions.
A composition of matter comprising one or more populations of polyatomic gaseous ions, at least one of said populations comprising multiply charged ions formed from the same chemically distinct parent species of polyatomic neutral molecules, said same chemically distinct species of polyatomic neutral molecules not including synthetic polymers such as poly (ethylene glycol)s, all of said multiply charged ions, formed from said same chemically distinct species of polyatomic neutral molecules, having at least three charges.
A composition of matter comprising one or more populations of polyatomic gaseous ions, at least one of said populations of polyatomic ions comprising multiply charged ions formed from the same chemically distinct parent species of polyatomic neutral molecules, said chemically distinct parent species of polyatomic molecules not being selected from the class comprising oligomers of synthetic polymers such as poly (ethylene glycol)s, the number of charges on each ion defining the charge state number of that ion, said at least one of said populations of polyatomic multiply charged ions comprising a plurality of sub-populations, one such sub-population for each possible integral value of charge state number beginning with a smallest value not less than three and extending to a largest value not less than five.
A composition of matter comprising one or more populations of polyatomic gaseous ions, all of the ions in at least one of said populations comprising multiply charged polyatomic ions having a net charge equal to or greater than three elementary charges and a composition characterized by the empirical chemical formula (Cc Hh Nn Oo Ss Pp Tt Uu Vv Ww Yy) wherein upper case letters C, H, N, O, S, P stand respectively for the elements Carbon, Hydrogen, Nitrogen, Oxygen, Sulfur, Phosphorous and T, U, V, W, Y each stand for other elements in the Periodic Table, the lower case subscript letters associated with each of said upper case letters symbolizing an integer equal to the number of atoms of the corresponding element in said ion, all the ions with three or more charges in at least one of said one or more populations of ions having compositions such that the number of different subscripts c, h, o, n, p, s, t, u, v, w, y having values greater than zero is five or less, said ions not being derived from a member of the class of synthetic polymers that include poly (ethylene glycol)s.
A composition of matter comprising one or more populations of gaseous ions, at least one of said populations comprising multiply charged polyatomic ions having a net charge equal to or greater than three elementary charges and a composition characterized by the empirical chemical formula (Cc Hh Nn Oo Ss Pp Tt Uu Vv Ww Yy) wherein upper case letters C, H, N, O, S, P stand respectively for the elements Carbon, Hydrogen, Nitrogen, Oxygen, Sulfur, Phosphorous and T, U, V, W, Y each stand for other elements in the Periodic Table, the lower case letters symbolizing an integer equal to the number of atoms of the corresponding element in said ion, all the ions with three or more charges in at least one of said one or more populations of polyatomic ions having compositions such that the number of different subscripts c, h, n, o, p, s, t, u, v, w, y having values greater than zero is greater than five.
Dependencies are inferred from the claim text.