Catalogue / Modified GRF (1-29)
Modified GRF (1-29)
Also written as CJC-1295 without DAC, Mod GRF 1-29.
A tetrasubstituted GRF (1-29) analogue with substitutions that resist enzymatic degradation, sold without the albumin-binding linker.
| Class | Growth hormone secretagogues |
| Determination | Peptide analysis, specialist compound |
| Price | 590 USD |
Modified GRF (1-29) is identified against a certified reference standard rather than against a published mass, because commercially supplied material varies in composition between suppliers. Purity is reported separately by reversed-phase chromatography at 214 nm and describes the chromatographable fraction only.
| The compound is frequently sold as CJC-1295, which is the name of the DAC-bearing version. The two differ by the linker mass and by price. |
| The D-alanine at position 2 is the substitution that blocks dipeptidyl peptidase cleavage. It is not resolved by achiral chromatography, so a purity figure does not confirm it and a mass measurement does not either. |
| No mass figure is published here for the same reason as the DAC version. |
Every compound fails in its own way. A generic peptide method applied without regard to these specifics produces a number that looks like a result and is not one.
Short synthetic peptides, most carrying D-amino acids or unnatural residues that make them resistant to serum peptidases and invisible to sequence-only reasoning.
LC-MS identity against a certified reference standard, purity by RP-HPLC at 214 nm. D-isomers are not resolved by a conventional C18 column and are not claimed to be.
Where the delivered milligram figure matters rather than the percentage, net peptide content by combustion analysis and water by Karl Fischer are added, and the certificate carries a closed mass balance instead of a single purity number.
| LC-MS identity | Measured mass |
| RP-HPLC purity | Area at 214 nm |
| Net peptide content | Milligrams |
| Water content | Karl Fischer |
| Counter-ion | Ion chromatography |
| Bacterial endotoxins | USP <85> |
What is the molecular weight of Modified GRF (1-29)?
No molecular weight is published for Modified GRF (1-29) on this page, because the composition of commercially supplied material varies between suppliers and an unverified figure on an analytical site is worse than an absent one. Identity is established against a certified reference standard at the time of analysis.
How is Modified GRF (1-29) tested for purity and identity?
LC-MS identity against a certified reference standard, purity by RP-HPLC at 214 nm. D-isomers are not resolved by a conventional C18 column and are not claimed to be. Purity describes the chromatographable fraction only and is not the same quantity as the peptide mass delivered per vial.
What goes wrong when Modified GRF (1-29) is analysed?
The compound is frequently sold as CJC-1295, which is the name of the DAC-bearing version. The two differ by the linker mass and by price.
What does Modified GRF (1-29) analysis cost at ANALYTON?
Peptide analysis, specialist compound is priced at 590 US dollars, covering the determinations described on this page. Content, safety and elemental determinations are ordered alongside and are priced separately on the price list.
Other compounds in this class
Updated 2026-09-01. Masses computed at build, not transcribed.