Monoisotopic mass (original) (raw)
La masse mono-isotopique est la masse d'une molécule calculée à partir de l'isotope le plus abondant de chaque élément la constituant . En spectrométrie de masse, c'est celle du premier pic du profil isotopique, donc le moins lourd. Attention cependant, la masse monoisotopique n'est pas toujours plus petite que la masse moléculaire : tout dépend de la composition de la molécule.
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| dbo:abstract | La masse mono-isotopique est la masse d'une molécule calculée à partir de l'isotope le plus abondant de chaque élément la constituant . En spectrométrie de masse, c'est celle du premier pic du profil isotopique, donc le moins lourd. Attention cependant, la masse monoisotopique n'est pas toujours plus petite que la masse moléculaire : tout dépend de la composition de la molécule. (fr) Monoisotopic mass (Mmi) is one of several types of molecular masses used in mass spectrometry. The theoretical monoisotopic mass of a molecule is computed by taking the sum of the accurate masses (including mass defect) of the most abundant naturally occurring stable isotope of each atom in the molecule. For small molecules made up of low atomic number elements the monoisotopic mass is observable as an isotopically pure peak in a mass spectrum. This differs from the nominal molecular mass, which is the sum of the mass number of the primary isotope of each atom in the molecule and is an integer. It also is different from the molar mass, which is a type of average mass. For some atoms like carbon, oxygen, hydrogen, nitrogen, and sulfur the Mmi of these elements is exactly the same as the mass of its natural isotope, which is the lightest one. However, this does not hold true for all atoms. Iron's most common isotope has a mass number of 56, while the stable isotopes of iron vary in mass number from 54 to 58. Monoisotopic mass is typically expressed in daltons (Da), also called unified atomic mass units (u). (en) In chimica si definisce massa monoisotopica di una molecola la massa molecolare di quella molecola calcolata prendendo per ogni elemento la massa esatta dell'isotopo più abbondante in natura. Ad esempio il peso di un atomo di idrogeno sarà 1,007825 u, quello di un atomo di azoto 14,00307 u, quello di un ossigeno 15,99491 u. (it) |
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| rdfs:comment | La masse mono-isotopique est la masse d'une molécule calculée à partir de l'isotope le plus abondant de chaque élément la constituant . En spectrométrie de masse, c'est celle du premier pic du profil isotopique, donc le moins lourd. Attention cependant, la masse monoisotopique n'est pas toujours plus petite que la masse moléculaire : tout dépend de la composition de la molécule. (fr) In chimica si definisce massa monoisotopica di una molecola la massa molecolare di quella molecola calcolata prendendo per ogni elemento la massa esatta dell'isotopo più abbondante in natura. Ad esempio il peso di un atomo di idrogeno sarà 1,007825 u, quello di un atomo di azoto 14,00307 u, quello di un ossigeno 15,99491 u. (it) Monoisotopic mass (Mmi) is one of several types of molecular masses used in mass spectrometry. The theoretical monoisotopic mass of a molecule is computed by taking the sum of the accurate masses (including mass defect) of the most abundant naturally occurring stable isotope of each atom in the molecule. For small molecules made up of low atomic number elements the monoisotopic mass is observable as an isotopically pure peak in a mass spectrum. This differs from the nominal molecular mass, which is the sum of the mass number of the primary isotope of each atom in the molecule and is an integer. It also is different from the molar mass, which is a type of average mass. For some atoms like carbon, oxygen, hydrogen, nitrogen, and sulfur the Mmi of these elements is exactly the same as the mas (en) |
| rdfs:label | Masse mono-isotopique (fr) Massa monoisotopica (it) Monoisotopic mass (en) |
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