I now need to detect 8 types of peptides, with each peptide containing 16-38 amino acids. So far, I haven't found anyone who has tested them. What suitable methods are available?
Detecting 8 types of peptides (amino acid length 16-38). If there is no literature precedent, you can choose the appropriate method based on your experimental needs (qualitative or quantitative, sensitivity, throughput, etc.). Here are some recommended main detection methods:
1. Mass Spectrometry (MS) — High sensitivity, high resolution
1. Suitable situations
(1) Precise identification of peptide sequences is required
(2) Quantitative analysis is needed
(3) Low abundance samples
2. Method selection
(1) MALDI-TOF MS (Matrix-Assisted Laser Desorption/Ionization Time of Flight Mass Spectrometry): Suitable for rapid detection, especially for synthetic peptides or single-component samples.
(2) LC-MS/MS (Liquid Chromatography-Tandem Mass Spectrometry): Suitable for complex samples, especially biological samples (such as serum, tissue homogenates, etc.).
(3) HRMS (High-Resolution Mass Spectrometry): Used for precise molecular weight determination, suitable for identifying unknown peptides.
2. Reverse Phase High-Performance Liquid Chromatography (RP-HPLC) — Separation, purification, and detection
1. Suitable situations
(1) Purification of peptides or content detection is required
(2) Samples are synthetic peptides or naturally derived with fewer impurities
2. Method selection
(1) C18 Reverse Phase Column + UV Detection (UV 214 nm/280 nm)
(2) HPLC-DAD (Diode Array Detection)
(3) HPLC-FLD (Fluorescence Detection) (if peptides contain tryptophan, tyrosine)
3. Protein Chemical Methods (e.g., Edman Degradation)
1. Suitable situations
(1) Small-scale sequence validation.
(2) However, low efficiency and not suitable for complex samples.
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