General Procedure for Peptide Coupling Synthesis of (S,S) Di-Tert-Butyl (5-(Tert-Butoxy)-4-((Tert-Butoxycarbonyl)Amino)-5-Oxopentanoyl)Glutamate 1 ( S )Boc-Glu-O t Bu (1 mmol, 303.4 mg), ( S )HCl,H-Glu(O t Bu)-O t Bu (1 mmol, 295.8 mg), BOP (1.2 mmol, 530.7 mg), and DIEA (3 mmol, 0.52 ml, pH = 8.5) were dissolved in THF (15 ml) and stirred at room temperature
TA (500 mg/5 ml, ready to use ampule) was injected intradermally in the lesions on right cheek, 0.05 ml (5 mg)-1 cm apart using a 29G, 40 IU/ml insulin syringe, whereas glutathione (600 mg vial in powder formulation) was prepared by dissolving in 5 ml of distilled water and injected intradermally on left cheek, 0.05 ml1 cm apart using a 29G, 40 IU/ml insulin syringe
To solve this, researchers developed a glutathione amino acid precursor (GAP) blend, a special mix of ingredients that helps the skin produce its own glutathione from within
GHK refers to the free tripeptide (Gly-His-Lys, MW 340.38 g/mol)