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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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151 – 165 of 186 results
151

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
152

Sigma Aldrich Fine Chemicals Biosciences 2-Propanol-1,1,1,3,3,3-d6 99 atom % D | 3976-29-2 | MFCD00144521 | 1G

2-Propanol-1,1,1,3,3,3-d6 99 atom % D | Purity: 99% (CP) | Mol Wt: 66.13 | 3976-29-2 | MFCD00144521 | 1G

ENCOMPASS
153

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
154

Sigma Aldrich Fine Chemicals Biosciences Benzonitrile-d5 99 atom % D | 2102-15-0 | MFCD00190382 | 1G

Benzonitrile-d5 99 atom % D | Purity: 99% (CP) | Mol Wt: 108.15 | 2102-15-0 | MFCD00190382 | 1G

ENCOMPASS
155

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
156

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
157

Sigma Aldrich Fine Chemicals Biosciences Nitazoxanide United States Pharmacopeia (USP) Reference Standard | 55981-09-4 | MFCD00416599 | 200MG

Nitazoxanide United States Pharmacopeia (USP) Reference Standard | Mol Wt: 307.28 | 55981-09-4 | MFCD00416599 | 200MG

ENCOMPASS
158

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
159

Sigma Aldrich Fine Chemicals Biosciences 1-Propanol-d8 98 atom % D | 61393-63-3 | MFCD00190503 | 1G

1-Propanol-d8 98 atom % D | Purity: 99% (CP) | Mol Wt: 68.14 | 61393-63-3 | MFCD00190503 | 1G

ENCOMPASS
160

Sigma Aldrich Fine Chemicals Biosciences Pyridine-d5 N-oxide 98 atom % D | 19639-76-0 | MFCD02093733 | 1G

Pyridine-d5 N-oxide 98 atom % D | Mol Wt: 100.13 | 19639-76-0 | MFCD02093733 | 1G

ENCOMPASS
161

MEDCHEMEXPRESS LLC VD2-D3 1MG
SDP

50-187-3193 VD2-D3 1MG

ENCOMPASS_PREFERRED
162

MEDCHEMEXPRESS LLC MAXACALCITOL-D6 1MG
SDP

50-187-3192 MAXACALCITOL-D6 1MG

ENCOMPASS_PREFERRED
163

MEDCHEMEXPRESS LLC PARICALCITOL-D6 5MG
SDP

50-187-3958 PARICALCITOL-D6 5MG

ENCOMPASS_PREFERRED
164

MEDCHEMEXPRESS LLC CALCITRIOL D6 1MG
SDP

50-187-3966 CALCITRIOL D6 1MG

ENCOMPASS_PREFERRED
165

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