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6 Kang JH et al
Each production batch undergoes comprehensive testing for identity, purity, heavy metal contamination, microbial contamination, and endotoxin levels to ensure absolute safety and efficacy for use in high-end skincare formulations

(13)Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (13) Preparation of Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (12)Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin(20DMF)5203DMF3DMF2Fmoc-Pro-OH0.8gDIEA0.4mlTBTU0.56gHOBT0.2gDMF10ml1.53DMF3DMF2Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin In the Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin of step (12), add decapping reagent (20% DMF solution of piperidine), reacted at room temperature for 5 minutes, drained, re-added capping agent and reacted at room temperature for 20 minutes, washed 3 times with isopropanol, washed 3 times with DMF, washed 2 times with re-distilled DMF, drained, added Fmoc-Pro-OH0.8g, DIEA0.4ml, TBTU0.56g, HOBT0.2g, DMF10ml, react at room temperature for 1.5 hours, dry with a vacuum pump, wash with isopropanol for 3 times, DMF for 3 times, and redestilled DMF for washing 2 times, drained to obtain Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin
