Wssrige Seren auf Basis von Hyaluronsure sind am hufigsten, da sie eine gute Lslichkeit des Kupferkomplexes und eine optimale Penetration gewhrleisten
10.1007/s00240-004-0425-7 21 AzeemM.HanifM.MahmoodK.AmeerN.ChughtaiF

(9)Fmoc-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val- (9) Preparation of Fmoc-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin: (8)Fmoc-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-1050530105010603DMF3DMF2DMFFmoc-Lys(Boc)-OHDIEATBTU/HOBtHBTU/HOBtBOP/HOBt105010603DMF3DMF2Fmoc-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val- In the Fmoc-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin in step (8), add the decapping reagent and react at 10-50C for 5-30 minutes, and dry it with a vacuum pump , re-add the decapping reagent and react at 10-50C for 10-60 minutes, drain, wash with isopropanol 3 times, DMF wash 3 times, re-distilled DMF wash 2 times, add Fmoc-Lys (Boc-Lys) dissolved in DMF )-OH, DIEA, TBTU/HOBt or HBTU/HOBt or BOP/HOBt mixture, react at 10-50C for 10-60 minutes, dry it with a vacuum pump, wash with isopropanol for 3 times, DMF for 3 times, redistill The DMF washed 2 times, drained to obtain Fmoc-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin

Having worked in the food industry I know that there is no set method of determining shelf life and it is up to the producer to chose what "use by" or "best before" dates they want to put on their stock, based on their own view of the product under normal conditions