Half-Life Determination of Carbon (14) with a Mass Spectrometer and Low Absorption Counter

1946 ◽  
Vol 70 (9-10) ◽  
pp. 772-773 ◽  
Author(s):  
L. D. Norris ◽  
M. G. Inghram
Keyword(s):  
Mass Spectrometer ◽  
Half Life ◽  
Carbon 14

Mass Spectrometer Determination of the Half-Life ofXe133

1949 ◽  
Vol 75 (3) ◽  
pp. 532-533 ◽  
Author(s):  
J. Macnamara ◽  
C. B. Collins ◽  
H. G. Thode
Keyword(s):  
Mass Spectrometer ◽  
Half Life

THE MASS SPECTROMETER DETERMINATION OF THE HALF-LIFE OF Kr85

1953 ◽  
Vol 31 (4) ◽  
pp. 517-519 ◽  
Author(s):  
R. K. Wanless ◽  
H. G. Thode
Keyword(s):  
Fission Product ◽  
High Precision ◽  
Mass Spectrometer ◽  
Half Life

The half-life of Kr85 has been redetermined using the high precision mass spectrometer method. Several samples of krypton gas extracted from fission product material have been investigated over a period of seven years. The half-life of Kr85 has been found to be 10.27 ± 0.18 years.

A Determination of the Half-Life of Carbon 14

1949 ◽  
Vol 76 (7) ◽  
pp. 885-889 ◽  
Author(s):  
W. M. Jones
Keyword(s):  
Half Life ◽  
Carbon 14

A Rapid Method for Determination of Buprenorphine and Norbuprenorphine in Urine by UPLC-MS/MS

2020 ◽  
Vol 16 ◽  
Author(s):  
Aykut Kul ◽  
Murat Ozdemir ◽  
Selma Ozilhan ◽  
Olcay Sagirli
Keyword(s):  
Forensic Science ◽  
Rapid Method ◽  
Proficiency Testing ◽  
Mass Spectrometer ◽  
Illicit Market ◽  
Analysis Methods ◽  
Accuracy And Precision ◽  
Lower Limits

Background: Buprenorphine is quite common in the illicit market. Buprenorphine-containing drugs abuse is frequently encountered in patients. The analysis methods used to determine the abuse of buprenorphine and norbuprenorphine are important for forensic science. Buprenorphine is metabolized to norbuprenorphine by the liver. Objective: Therefore, the determination of buprenorphine and norbuprenorphine in urine is one of the methods to determine the abuse of buprenorphine. Methods: In this study, we have developed a precise, simple, and rapid ultra-performance liquid chromatographytandem mass spectrometer method for the determination of buprenorphine and norbuprenorphine simultaneously. Results: The developed method was validated in terms of selectivity and linearity, which was in the range of 9–1800 ng/mL for both buprenorphine and norbuprenorphine. The intra-assay and inter-assay accuracy and precision were found within acceptable limits of the EMA guideline. Lower limits of quantitation were 9 ng/mL for both buprenorphine and norbuprenorphine. Conclusion: The developed method was successfully applied for the determination of both analytes in the proficiency testing samples.

scholarly journals Advances in LC–MS/MS Methods for Allergen Testing, Meat Speciation, and Gelatin Speciation

2019 ◽  
Vol 102 (5) ◽  
pp. 1309-1315
Author(s):  
Jianru Stahl-Zeng ◽  
Ashley Sage ◽  
Philip Taylor ◽  
Jeremy Dietrich Netto ◽  
Tuo Zhang
Keyword(s):  
Mass Spectrometer ◽  
Multiple Reaction Monitoring ◽  
Proteome Analysis ◽  
Food Product ◽  
Transition Analysis ◽  
Tandem Quadrupole Mass Spectrometer ◽  
Signature Peptides ◽  
Unique Markers ◽  
Multiple Species

Abstract Background: Food authenticity is demanded by the consumer at all times. The consumer places trust in the manufacturer that the food product is genuine in terms of what is recorded on the packaging label. Objective: Recent advancements in LC–tandem MS methodology in the detection of allergens, meat, and gelatin speciation in raw food products and processed foods are detailed in this paper. Method: For each of the three methods, initial proteome analysis and the screening leading to the determination of unique tryptic peptides were conducted using a high-resolution, accurate tandem mass spectrometer. Having identified the unique markers, the method was transferred to a tandem quadrupole mass spectrometer for a higher-sensitivity quantitative study, multiple reaction monitoring transition analysis. Results: For the allergens method a detection limit of at least 10 ppm was attained across the 12 allergen peptides in this workflow. In the gluten workflow the resulting chromatograms show good detection down to 5 ppm, with no interference from the food matrices. The meat speciation method details that signature peptides could be readily identified at 1% w/w with no matrix interference. Conclusions: These single-injection workflows with cycle-time optimization enable wide coverage of analytes to identify multiple species within challenging matrix samples.

A determination of the half-life of14C

1968 ◽  
Vol 58 (1) ◽  
pp. 232-246 ◽  
Author(s):  
F. Bella ◽  
M. Alessio ◽  
P. Fratelli
Keyword(s):  
Half Life

Lumas-30 time-of-flight mass spectrometer with pulsed glow discharge for direct determination of nitrogen in steel

2011 ◽  
Vol 66 (14) ◽  
pp. 1411-1416 ◽  
Author(s):  
A. A. Ganeev ◽  
A. R. Gubal’ ◽  
V. I. Mosichev ◽  
N. V. Pershin ◽  
S. N. Petrov ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Mass Spectrometer ◽  
Time Of Flight ◽  
Direct Determination ◽  
Pulsed Glow Discharge ◽  
Flight Mass Spectrometer
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