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6 protocols using 2 2 azinobis 3 ethylbenzothiazoline 6 sulphonate

1

Assessing Antioxidant Potential of Açaí Fruit

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Freeze-dried and milled organic açaí fruit was obtained from “Healthy Foods”. Zein (Z 3625), 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azinobis(3-ethylbenzothiazoline-6-sulphonate) (ABTS), Folin–Ciocalteu phenol reagent, anhydrous sodium carbonate, gallic acid (GA), ferric 2,4,6-tripyridyl-s-triazine (TPTZ) and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) were obtained from Sigma–Aldrich (Santiago, Chile). Lipase (L3126) and pancreatin (P1750) from porcine pancreas, pepsin (P6887) from porcine gastric mucosa, and porcine bile extract (B8631) were purchased from Sigma–Aldrich (Sigma–Aldrich S.A., USA). NaOH, HCl and different salts to prepare simulated digestion fluids (KCl, KH2PO4, NaHCO3, NaCl, MgCl2.(H2O)6, (NH4)2CO3, and CaCl2.(H2O)2) were purchased from Merck (Merck KGaA S.A., Darmstadt, Germany).
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2

Comparative Antioxidant and Tyrosinase Inhibition

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Tyrosinase from mushroom lyophilized powder (EC 1.14.18.1), hyaluronidase from bovine testes (EC 3.2.1.35), gallic acid, kojic acid, Trolox, l-ascorbic acid, l-tyrosine, l-DOPA, trifluoroacetic acid, Folin–Ciocalteu reagent, 2,4,6 tripyridyl-s-triazine (TPTZ), 2,2′-diphenyl-1-picrylhydrazyl-hydrate (DPPH), and 2,2’-azinobis 3-ethylbenzothiazoline-6-sulphonate (ABTS) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Ferrous sulfate (FeSO4), sodium carbonate (Na2CO3), sodium acetate (CH3COONa), acetic acid (CH3COOH), hydrochloric acid (HCl), potassium persulfate (K2S2O8), sodium chloride (NaCl), monosodium phosphate (NaH2PO4), and disodium phosphate (Na2HPO4) were purchased from RCI Labscan Co., Ltd. (Bangkok, Thailand). Bovine serum albumin, AR grade ethanol, and HPLC grade acetonitrile were purchased from Merck (Darmstadt, Germany).
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3

Phytochemical Analysis and Antioxidant Activity

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Gallic acid, rutin, toluidine blue, DNS reagent, cephalexin, and ampicillin were purchased from Yuanye Biotechnology Co. (Shanghai, China). Acarbose, α-amylase, α-glucosidase, p-nitrophenyl-β-D-galactopyranoside (PNPG), 2,3,5-triphenyl tetrazolium chloride (TTC), 6-Hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (Trolox), Folin–Ciocalteu reagent, dimethyl sulfoxide (DMSO), 1,1-Diphenyl-2-picrylhydrazyl (DPPH), 2,2′-Azinobis-(3-ethylbenzothiazoline-6-sulphonate) (ABTS), and 2,4,6-tris(2-pyridyl)-s-triazine (TPTZ) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Sodium hydroxide, hydrochloric acid, glacial acetic acid, ferric chloride, anhydrous sodium carbonate, potassium persulfate, sodium acetate, aluminum nitrate, sodium nitrite, and other regents were obtained from Bodi Chemical Co. (Tianjin, China). HPLC-grade formic acid, acetonitrile, and methanol were bought from CNW Technologies GmbH (Duesseldorf, Germany).
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4

Antioxidant Evaluation Reagent Procurement

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Folin-Ciocalteu reagent, sodium carbonate anhydrous (Na2CO3), gallic acid, sodium nitrite solution (NaNO), sodiumhydroxyde (NaOH), aluminum chloride hexahydrate solution (AlCl3, 6H2O), iron (III) chloride anhydrous (FeCl3), and catechin were purchased from Fluka (Buchs, Switzerland). 2,2-diphenyl-1-picrylhydrazyl-(DPPH), 2,6-di-tert-butyl-4-hydroxytoluene (BHT), Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid), and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonate (ABTS) were purchased from Sigma-Aldrich (Murcia, spain), Tris (hydroxymethyl)-aminomethane (TRIS), and l-cysteine of analytical grade were obtained from Merck, Darmstadt, Germany. 5,5-dithiobis (2-nitrobenzoic acid) (DTNB) all of analytical grade were obtained from Fluka, Stenheim, Germany. Sodium dodecyl sulfate (SDS) was obtained from AppliChem GmbH, Darmstadt, Germany. Commercial mix was purchased from a supermarket (Murcia, spain).
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5

Cucumis metuliferus Antioxidant Extraction

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Cellulose acetate with Mn = 30,000 and 39.8 wt.% acetyl content (CA degree of substitution = 2.5 [42 (link)]) was supplied by Sigma-Aldrich (Santiago, Chile). A commercial corona-treated low-density polyethylene (LDPE) film was kindly supplied by EDELPA (Santiago, Chile). The Cucumis metuliferus fruits were obtained at a local market in Santiago de Chile. 2,2-azinobis(3-ethylbenzothiazoline-6-sulphonate) (ABTS), Folin Ciocalteu phenol reagent, anhydrous sodium carbonate, gallic acid and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) were purchased from Sigma Aldrich. Acetone (99.9% HPLC grade) and absolute ethanol (99.9% HPLC grade) were supplied by Merck (Santiago, Chile).
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6

Enzymatic Hydrolysis of Dried SY

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Dried SY with a protein concentration of 41.96% was kindly provided by a beer factory from Ploiesti, Romania. Bromelain was provided by Carl Roth (Karlsruhe, Germany), Neutrase 5.0 BG by Novo Nordisk (Bagsværd, Denmark) and trypsin by Merck (Darmstadt, Germany), whereas o-phthaldialdehyde (OPA), N-acetyl-cysteine (NAC), sodium dodecyl sulfate (SDS), 2,2-diphenyl-1-picryl-hydrazyl (DPPH) and 2,2′-azinobis(3-ethyl-benzothiazoline-6-sulphonate) (ABTS) were purchased from Sigma Aldrich (Burlington, MA, USA). All other reagents were of analytical grade.
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