ペプチド修飾
ペプチド検査
The role of peptide testing
Peptide testing determines the purity, molecular weight, sequence correctness, and the presence of impurities of peptides. This is crucial for scientific research experiments, drug development and clinical applications because: high purity peptides (例えば. >95%) can reduce experimental interference and improve data reliability. Impurity peptides may affect biological activity or even trigger an immune response (例えば. impurities in drugs may cause allergy or toxicity).
Commonly used assays:
HPLC (High Performance Liquid Chromatography): analyses peptide purity and impurity composition.
Mass Spectrometry (MS): Determine molecular weight and verify sequence accuracy.
Amino acid analysis (AAA): quantitatively determine the amino acid composition of the peptide.
Verification of the biological activity and function of peptides
Ensure stability of peptide reagents
Ensure sterility and endotoxin compliance
Common Peptide Testing
It mainly includes the purity of peptides; content testing; sterility testing; PH値; moisture testing; solubility testing and other aspects.
無菌性
Direct inoculation method: inoculate into both media, incubate for 14 days and observe for microbial growth.
Membrane filtration method: The solution was passed through a sterile filter membrane (pore size 0.22 μm), microorganisms were trapped on the membrane, which was transferred to the culture medium for incubation.
ATP bioluminescence: Detection of ATP produced by microbial metabolism, rapid (時間) but requires validation.
Purity
RP-HPLC: Based on the difference in hydrophobicity of the peptides, separation on a C18/C8 column and detection by UV or MS.
MS: Determination of peptide molecular weight (MALDI-TOF or ESI-MS), verification of agreement with theoretical values and detection of modifications or impurities.
Amino acid analysis principle: after acid hydrolysis of the peptide, quantify the composition of each amino acid and verify the purity by comparing with the theoretical value.
SDS-PAGE: Separation by electrophoresis and observation of single bands by Caulmers Brilliant Blue or Silver staining.
コンテンツ
元素分析: By decomposing complex physical processes into many tiny “meta-processes”, each “meta-process” follows the same law, the problem is simplified by analyzing these “meta-processes” and applying necessary mathematical methods.
Conservation of mass: あらゆる物理的または化学反応において, 反応に関与する物質の質量の合計は、反応後の生成物の総質量に等しい.
Area normalisation:これは、物理システムの絶対値を相対値関係に変換するものとして数学的に定義される方法です。. 正規化を通じて, 計算を簡素化し、値を効果的に削減できます。.
ペプチド検査
Get peptide testing quotes to accurately track the feasibility of your experimental process.
