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Isotope Standards

Compounds (solids, liquids, gasses) with well-defined isotopic compositions that act as the ultimate sources of accuracy in mass spectrometric measurements of isotope ratios.

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1 – 15 of 94 results
1

ASI CHEMICALS LLC

NC4016794 CORTISONE-D8 5X1MG

ENCOMPASS_PREFERRED
2

ASI CHEMICALS LLC

NC4017294 GUDCA-D4 GLYCOURSODEOXCHO 10MG

ENCOMPASS_PREFERRED
3

eMolecules​ 2743-90-0 | (R,S)-Anatabine | Toronto Research Chemicals | MFCD00078278 | 160.220 | C10H12N2C1NC(CC=C1)c1cccnc1 | 10mg | 483380453

(R,S)-Anatabine | Toronto Research Chemicals | 2743-90-0 | MFCD00078278 | 160.220 | C10H12N2C1NC(CC=C1)c1cccnc1 | 10mg | 483380453

ENCOMPASS_PREFERRED
4

eMolecules​ 811-98-3 | Methanol-D4 >99.5% | Oakwood Chemicals | MFCD00044637 | 36.066 | CH4O | 99.000 | [2H]OC([2H])([2H])[2H] | 10ml | 480168087

Methanol-D4 >99.5% | Oakwood Chemicals | 811-98-3 | MFCD00044637 | 36.066 | CH4O | 99.000 | [2H]OC([2H])([2H])[2H] | 10ml | 480168087

ENCOMPASS_PREFERRED
5

Sigma Aldrich Fine Chemicals Biosciences 4,4'-Bipyridyl-d8 98 atom % D | 132125-39-4 | MFCD01074250 | 1G

4,4'-Bipyridyl-d8 98 atom % D | Purity: 99% (CP) | Mol Wt: 164.23 | 132125-39-4 | MFCD01074250 | 1G

ENCOMPASS
6

Sigma Aldrich Fine Chemicals Biosciences Acenaphthylene-d8 >=98 atom % D, 98% (CP) | 93951-97-4 | MFCD00143527 | 500MG

Acenaphthylene-d8 >=98 atom % D, 98% (CP) | Purity: 98% (CP) | Mol Wt: 160.24 | 93951-97-4 | MFCD00143527 | 500MG

ENCOMPASS
7

Sigma Aldrich Fine Chemicals Biosciences Cocaethylene-D8 solution 1

An analog of benzoylecgonine cocaethylene is a metabolite of cocaine formed in the presence of ethanol. This stable-labeled internal standard is suitable for quantitation of cocaethylene levels in urine blood and saliva by LC/MS or GC/MS for urine drug testing clinical toxicology forensic analysis or isotope dilution methods.

ENCOMPASS
8

Sigma Aldrich Fine Chemicals Biosciences Enalaprilat dihydrate European Pharmacopoeia (EP) Reference Standard | 84680-54-6 | MFCD00941393 |

Enalaprilat dihydrate European Pharmacopoeia (EP) Reference Standard | Mol Wt: 384.42 | 84680-54-6 | MFCD00941393 |

ENCOMPASS
9

Sigma Aldrich Fine Chemicals Biosciences Isotopic standard for chlorine NIST(R) SRM(R) 975a | 7647-14-5 | MFCD00003477 |

Isotopic standard for chlorine NIST(R) SRM(R) 975a | Mol Wt: 58.44 | 7647-14-5 | MFCD00003477 |

ENCOMPASS
10

Sigma Aldrich Fine Chemicals Biosciences 2,2'-Dipyridyl-d8 98 atom % D | 32190-42-4 | MFCD00190432 | 1G

2,2'-Dipyridyl-d8 98 atom % D | Mol Wt: 164.23 | 32190-42-4 | MFCD00190432 | 1G

ENCOMPASS
11

Sigma Aldrich Fine Chemicals Biosciences Nitazoxanide >=98% (HPLC) | 55981-09-4 | MFCD00416599 | 50MG

Nitazoxanide >=98% (HPLC) | Purity: >=98% (HPLC) | Mol Wt: 307.28 | 55981-09-4 | MFCD00416599 | 50MG

ENCOMPASS
12

Sigma Aldrich Fine Chemicals Biosciences Benzidine-(rings-d8) 98 atom % D | 92890-63-6 | MFCD00143662 | 100MG

Benzidine-(rings-d8) 98 atom % D | Purity: 99% (CP) | Mol Wt: 192.29 | 92890-63-6 | MFCD00143662 | 100MG

ENCOMPASS
13

Sigma Aldrich Fine Chemicals Biosciences Acenaphthylene-d8 >=98 atom % D, 98% (CP) | 93951-97-4 | MFCD00143527 | 100MG

Acenaphthylene-d8 >=98 atom % D, 98% (CP) | Purity: 98% (CP) | Mol Wt: 160.24 | 93951-97-4 | MFCD00143527 | 100MG

ENCOMPASS
14

Sigma Aldrich Fine Chemicals Biosciences Praziquantel Related Compound C United States Pharmacopeia (USP) Reference Standard | 125273-88-3 | 50MG

Praziquantel Related Compound C United States Pharmacopeia (USP) Reference Standard | Mol Wt: 342.39 | 125273-88-3 | 50MG

ENCOMPASS
15

Sigma Aldrich Fine Chemicals Biosciences Benzoyl chloride-d5 99 atom % D | 43019-90-5 | MFCD00134309 | 1G

Benzoyl chloride-d5 99 atom % D | Purity: 99% (CP) | Mol Wt: 145.6 | 43019-90-5 | MFCD00134309 | 1G

ENCOMPASS