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2 protocols using n ε carboxyethyllysine

1

Quantification of Advanced Glycation End-Products

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GO aqueous solution (40%), MGO aqueous solution (40%), o-phenylenediamine (OPD), o-phthaldialdehyde (OPA), ethylenediaminetetracetic acid (EDTA), gallic acid, 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt, 2,4,6-tris(2-pyridyl)-s-triazine (TPTZ), aminoguanidine (AG) hydrochloride, glucose, L-serine, sodium azide, acetic acid and formic acid were purchased from Sigma-Aldrich (St. Louis, MO). Hydrochloric acid (HCl, 37%), methanol HPLC-grade, acetonitrile HPLC- and LC-MS-grades, ammonium formate LC-MS-grade, 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) and potassium persulfate were obtained from Thermo Fisher Scientific (Waltham, MA). Sodium dihydrogen phosphate dihydrate (NaH2PO4·2H2O), di-sodium hydrogen phosphate dihydrate (Na2HPO4·2H2O), sodium acetate, Folin-Ciocalteu′s phenol reagent and iron (III) chloride hexaydrate (FeCl3 6H2O) were acquired from Merck (Darmstadt, Germany). Analytical standards N-ε-carboxyethyllysine (CEL) and N-ε-carboxyethyllysine-d4 (CEL-d4), N-ε-carboxymethyllysine (CML), N-ε-carboxymethyllysine-d4 (CML-d4), methylglyoxal hydroimidazolone trifluoroacetic acid salt (MG-H1), methylglyoxal-hydroimidazolone-d3 (MG-H1-d3) and furosine were purchased from Iris Biotech GmbH (Marktredwitz, Germany).
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2

Mass Spectrometry-Based Protein Analysis

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Bovine serum albumin fraction V (BSA; catalogue n. A6588), amino acids (catalogue n. LAA21), dopamine (catalogue n. H8502), acetylcholine (catalogue n. A6625) tyramine (catalogue n. T2879), γ-aminobutyric acid (GABA, catalogue n. 03,835), DL-lysine-4,4,5,5-d4 dihydrochloride (d4-lysine, catalogue n. 489,034), formic acid (catalogue n. 5.33002), salts, and buffers were purchased from Sigma-Aldrich (St. Louis, MO, USA). -carboxymethyllysine (CML, catalogue n. HAA2950) and -carboxyethyllysine (CEL, catalogue n. HAA2940) were obtained from Iris Biotech (Marktredwitz, Germany). Acetonitrile (catalogue n. 1.00029), water (catalogue n. 1.15333), and ammonium formate (catalogue n. 70,221) of mass spectrometry grade were obtained from Merck (Darmstadt, Germany).
Polyvinylidene difluoride (PVDF; catalogue n. GEH10600021) and nitrocellulose membranes (catalogue n GEH10600001) were from GE Healthcare (Milan, Italy).
Fuji Super RX films (catalogue n. 47,410–19,284), FujiFilm Man-X Developer (catalogue n. 949–966) and FujiFilm Man-X Fixer (catalogue n. 949–974) were from Laboratorio Elettronico Di Precisione (Naples, Italy).
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