Pyridine

The following reagents, 9-fluorenylmethoxycarbonyl (Fmoc) protected aa, O-(Benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU), N,N′-dicyclohexylcarbodiimide (DDC) and 1-hydroxybenzotrazole (HOBt), were purchased from AAPPTEC (Louisville, KY, USA), ChemMatrix resin (0.60 mmol/g) from PCAS BiomMatrix Inc. (Saint-Jean-sur-Richelieu, QC, Canada), N,N-diisopropylethylamine (DIPEA), triisopropylsilane (TIS), Triton X-100, α-cyano-4-hydroxycinnamic acid (HCCA), methanol and absolute ethanol from Sigma-Aldrich (St. Louis, MO, USA), piperidine, pyridine, phenol, potassium cyanide, isopropyl alcohol (IPA), acetonitrile (ACN), N-methyl-2-pyrrolidone (NMP), trifluoroacetic acid (TFA) and diethyl ether from Panreac (Barcelona, Spain), acetic anhydride (Ac₂O), ninhydrin and ethanedithiol (EDT) from Merck (Boston, MA, USA) and dichloromethane (DCM) from The Dow Chemical Company (Bogotá, Colombia).

Cervimunida johni lobster (known as yellow lobster) wastes in the form of powder were kindly supplied by Antartic Seafood S.A. (Coquimbo, Chile). Poly(lactic acid) (PLA, l-poly-lactide content is ≥99% w/w) with Mw of 180,000 g mol⁻¹ in the form of pellets was kindly provided by Futerro S.A. (Celles, Belgium). Dodecanoyl chloride acid (98.0%) was purchased from Aldrich. Hydrochloric acid (HCl, ACS reagent, 37.0%), sulfuric acid (H₂SO₄, ACS reagent, ≥95%), acetic anhydride (Ac₂O, ACS reagent, ≥98.0%), dimethylformamide (DMF, anhydrous, 99.8%), acetone (analytical standard, ≥99%), ethanol (analytical standard, 70%) and pyridine (ACS reagent, 99%) were purchased by Panreac (Barcelona, Spain). All reagents were used as received with exception of pyridine that was purified by distillation over sodium hydroxide.