Cysteine peptide/845727-64-2/Detection reagent

Description

Cysteine peptide is a heptapeptide containing cysteine, with its thiol group making it susceptible to a range of oxidative modifications. Cysteine peptide is used to detect the skin sensitization potential of chemical substances, including cosmetics ingredients.

Specifications

Apperance: White to off-white powder

Purity(HPLC): ≥98.0%

Single Impurity: ≤2.0%

Acetate Content(HPLC): 5.0%～12.0%

Water Content (Karl Fischer): ≤10.0%

Peptide Content: ≥80.0%

Packing and Shipping: Low temperature, vacuum packing, accurate to mg as required.

FAQ：

How do you dissolve polypeptides?

The solubility of polypeptide depends mainly on its primary and secondary structure, the nature of modification label, solvent type and final concentration. If the peptide is insoluble in water, ultrasound can help dissolve it. For basic peptide, it is recommended to dissolve with 10% acetic acid; For acidic peptides, dissolution with 10%NH4HCO3 is recommended. Organic solvents can also be added to insoluble polypeptides. The peptide is dissolved in the least amount of organic solvent (e.g., DMSO, DMF, isopropyl alcohol, methanol, etc.). It is highly recommended that the peptide be dissolved in the organic solvent first and then slowly added to water or other buffer until the desired concentration.

What are the best preservation conditions? How stable is the peptide?

After lyophilized, polypeptide can form fluff or flocculant powder, which can avoid premature degradation of polypeptide. Recommended storage conditions: a. -20℃ storage or dry environment b. Try to avoid repeated freeze-thaw c. Try to avoid storage in solution state (freeze-dried powder can be stored in separate packages for convenience of use) d. If it must be stored in solution, it is recommended to dissolve the peptides in sterile water under weakly acidic conditions and store at -20℃.

What is a peptide?

A peptide is a compound formed by α-amino acids connected by peptide bonds and is an intermediate product of protein hydrolysis. A compound formed by the dehydration condensation of two amino acid molecules is called a dipeptide, and similarly, there are tripeptides, tetrapeptides, pentapeptides, etc. A peptide composed of three or more amino acid molecules is called a polypeptide.

How are the goods transported?

For your goods, we will entrust DHL or other shipping companies to handle the shipment.