If the peptide appears invisible in the vials, there are several explanations:
Small Quantity: The amount of peptide might be too small to see with the naked eye. It is advisable to dissolve the peptide in the provided vials and proceed directly with your experiments.
Adherence to the Vial: The peptides may have adhered to the walls or cap of the vial. To ensure the peptide is collected, it is recommended to centrifuge or gently shake the vial before starting your experiments.
Water Absorption: Hydrophilic peptides may absorb water during transit or storage, making them less visible. To address this issue, it is recommended that the peptide be re-lyophilised before use.