Spectrometric mixture analysis: An unexpected wrinkle.
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| Title: | Spectrometric mixture analysis: An unexpected wrinkle. |
|---|---|
| Authors: | De Levie, Robert1 rdelevie@bowdoin.edu |
| Source: | Journal of Chemical Sciences. Sep2009, Vol. 121 Issue 5, p617-627. 11p. 5 Charts, 3 Graphs. |
| Subjects: | Spectrometry, Absorbance scale (Spectroscopy), Caffeine, Theobroma, Stimulants, Measure theory |
| Abstract: | The spectrometric analysis of a mixture of two chemically and spectroscopically similar compounds is illustrated for the simultaneous spectrometric determination of caffeine and theobromine, the primary stimulants in coffee and tea, based on their ultraviolet absorbances. Their analysis indicates that such measurements may need an unexpectedly high precision to yield accurate answers, because of an artifact of inverse cancellation, in which a small noise or drift signal is misinterpreted in terms of a concentration difference. The computed sum of the concentrations is not affected. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Chemical Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 47364039 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Spectrometric mixture analysis: An unexpected wrinkle. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22De+Levie%2C+Robert%22">De Levie, Robert</searchLink><relatesTo>1</relatesTo><i> rdelevie@bowdoin.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Chemical+Sciences%22">Journal of Chemical Sciences</searchLink>. Sep2009, Vol. 121 Issue 5, p617-627. 11p. 5 Charts, 3 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Spectrometry%22">Spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Absorbance+scale+%28Spectroscopy%29%22">Absorbance scale (Spectroscopy)</searchLink><br /><searchLink fieldCode="DE" term="%22Caffeine%22">Caffeine</searchLink><br /><searchLink fieldCode="DE" term="%22Theobroma%22">Theobroma</searchLink><br /><searchLink fieldCode="DE" term="%22Stimulants%22">Stimulants</searchLink><br /><searchLink fieldCode="DE" term="%22Measure+theory%22">Measure theory</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The spectrometric analysis of a mixture of two chemically and spectroscopically similar compounds is illustrated for the simultaneous spectrometric determination of caffeine and theobromine, the primary stimulants in coffee and tea, based on their ultraviolet absorbances. Their analysis indicates that such measurements may need an unexpectedly high precision to yield accurate answers, because of an artifact of inverse cancellation, in which a small noise or drift signal is misinterpreted in terms of a concentration difference. The computed sum of the concentrations is not affected. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Chemical Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12039-009-0075-y Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 617 Subjects: – SubjectFull: Spectrometry Type: general – SubjectFull: Absorbance scale (Spectroscopy) Type: general – SubjectFull: Caffeine Type: general – SubjectFull: Theobroma Type: general – SubjectFull: Stimulants Type: general – SubjectFull: Measure theory Type: general Titles: – TitleFull: Spectrometric mixture analysis: An unexpected wrinkle. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: De Levie, Robert IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 09743626 Numbering: – Type: volume Value: 121 – Type: issue Value: 5 Titles: – TitleFull: Journal of Chemical Sciences Type: main |
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