What it is
IGF-1 LR3 is human IGF-1 with two changes: arginine replaces glutamic acid at position 3, and a 13-residue extension is added at the N-terminus.
What researchers study
- Binds the IGF-1 receptor but binds IGF-binding proteins poorly, so more of it stays free and active.
- Widely used in cell culture media and in studies of IGF-1 receptor signaling.
Specifications
| Size | 83 residues, about 9.1 kDa |
| Form | Lyophilized powder |
| Vial sizes | 1 mg |
| Storage | Unopened: 2 to 8 °C, away from light |
How each lot is tested
Samples from every lot go to an independent, ISO/IEC 17025 accredited lab. Its report covers three tests:
- Purity by reversed-phase HPLC: the main peak's share of the total peak area.
- Identity by mass spectrometry: the observed mass is checked against the expected mass.
- Endotoxin, measured for every lot.
The lot number on your vial is the number on its report. How to check a certificate of analysis walks through what to look for.
The amount on the label is the weight of the powder. Besides the peptide it includes counter-ions and some water; Purity vs. peptide content explains the difference.
Storage and handling
Store unopened vials at 2 to 8 °C, away from light, as printed on the label. Let a cold vial reach room temperature before you open it, so moisture doesn't condense on the powder. More bench habits are in Handling.
For laboratory research use only. Not for human or veterinary use. This page describes the compound and published research on it. It is not a recommendation for any use.