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176 protocols using cinnamic acid

1

HPLC Analysis of Phenolic Compounds in Melon

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Analyses of phenolic compounds in melon pulp extract were performed using a high‐performance liquid chromatography (HPLC) (Hewlett‐Packard System) system equipped with a HP‐1100 pump, a Rheodyne model 7725 injector (Cotati, CA, USA, loop volume 20 μl), a UV detector (280 nm), and a C18 Technochrom Eurosphere 100 analytical column (250 mm × 8 mm). An aliquot of 3 ml of Maazoun flesh extract was filtered using a 0.45‐μm membrane filter before injection. The HPLC separation was running for a total time of 24 min and the flow rate was maintained at 0.50 ml/min. The mobile phases for chromatographic analysis were: (A) acetonitrile and (B) sulfuric acid/water (2:98). A linear gradient was run from 15% (A) and 85% (B) to 40% (A) and 60% (B) during 12 min; it changed to 60% (A) and 40% (B) in 2 min; after 4 min, it changed to 80% (A) and 20% (B); and then to 90% (A) and 10% (B) after 2 min; it becomes 100% (A) during 4 min. The data were stored and processed by HPLC ChemStation (DOS Series) (Hewlett‐Packard). Cinnamic acid (purchased from Sigma‐Aldrich) was used as internal standard for the quantification of phenolic compounds and the results were expressed as milligrams of Cinnamic acid per 100 g of flesh and as percentages.
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2

Lovastatin Purification and Quantification

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The lovastatin (LOV) raw material was purchased from Valdequimica, Brazil (purity reported to be >99%) and used without further purification. Adipic acid (ADI, 99% purity), citric acid (CIT, 99% purity), and tartaric acid (TAR, 99% purity) were acquired from Fischer Scientific (Hampton, NH, USA). Benzoic acid (BEN, 99% purity), salicylic acid (SAL, 99% purity) and cinnamic acid (CIN, 99% purity) were purchased from Merck (Darmstadt, Hesse, Germany), Mallinckrodt (Phillipsburg, NY, USA) and Sigma-Aldrich (Saint Louis, MO, USA), respectively. Lovastatin pharmaceutical secondary standard traceable to USP and PhEur Fluka brand used in the HPLC quantification studies was purchased from Sigma-Aldrich. All solvents were HPLC/UV grade, and water was purified using a Millipore system filtered through a Millipore 0.22 µm Millipak™ 40 membrane.
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3

Synthesis and Characterization of Titanium-based Compounds

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Tetraisopropyl titanate
(Ti(OC3H7)4, Merck, 97.0%), hydrochloric
acid (HCl,
Prolabo, 98.0%), sodium chloride (NaCl, Merck, 99.0%), sodium hydroxide
1.0 N solution (NaOH, Pharmacopoeia Europaea), cinnamic acid (C9H8O2, Merck, 97.0%), ethanol (C2H5OH, Merck, 99.5%), citric acid monohydrate (C6H8O7·H2O, Merck, 99.0%),
and cobalt(II) nitrate hexahydrate (Co(NO3)2·6H2O, Merck, 97.0%) were used in this investigation.
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4

Phenolic Standards Characterization Protocol

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Phenolic standards, namely, catechin, catechol, syringic acid, chlorogenic acid, cinnamic acid, ellagic acid, kaempferol, ferulic acid, gallic acid, rutin, caffeic acid, naringenin, benzoic acid, o-coumaric acid, p-hydroxybenzoic acid, pyrogallol, p-coumaric acid, quercetin, quinol, rosmarinic acid, and vanillic acid were bought from Merck KGaA (Darmstadt, Germany). The purities of standards were up to 99%. The solvents used were of analytical grade, dimethylsulfoxide (DMSO; Alfa Aesar GmbH & Co KG, Massachusetts, United States), orthophosphoric acid (H3PO4), ethanol, methanol, and acetonitrile HPLC-grade (Fisher Scientific International, Inc., Hampton, New Hampshire, United States).
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5

Synthesis and Characterization of Inorganic Compounds

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All the chemicals used, including inorganic salts such as bismuth (III) nitrate pentahydrate (BiNO3.5H2O), iron (III) nitrate nanohydrate (FeNO3.9H2O), phosphoric acid(H3PO4), and sodium hydroxide (NaOH); and organic compounds such as methanol, succinic acid, cinnamic acid, lactose, and maltose, were of analytical grade (purity > 99.99%), and were purchased from Merck. Cefixime trihydrate was obtained from Pharmagen limited Lahore (Pakistan) and used without further purification.
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6

Phytochemical Properties and Characterization

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Trans-cinnamaldehyde, sabinene hydrate, eugenol and terpineol (Table 1) were obtained from Sigma-Aldrich (Lisbon, Portugal); cinnamic acid was obtained from Merck (Lisbon, Portugal); citronellol was obtained from Acros Organics (Morris, NJ, USA). The structural and molecular properties of selected phytochemicals were determined with Molinspiration Calculation Software and Chemdraw (Malheiro et al., 2016 (link)). The phytochemicals were dissolved in dimethyl sulfoxide (DMSO, Sigma-Aldrich, St. Louis, MO, USA). Each compound was tested at various concentrations in the range of 1–25 mM in DMSO.
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7

Antioxidant and Analytical Reagents

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2,20-Diphenyl-1-picrylhydrazyl (DPPH), 2,20-azobis (2-amidinopropane), gallic acid dihydrochloride (AAPH), L-ascorbic acid, trichloroacetic acid (TCA), 1,1,3,3-tetraethoxypropane (TEP), thiobarbituric acid (TBA), and butylated hydroxytoluene (BHT) were purchased from Sigma (St. Lois, MO, USA). Folin-Ciocalteu phenol reagent was obtained from Fluka. Standards (gallic acid, cinnamic acid, rutin) were obtained from Merck Life Science (Merck KGaA, Darmstadt, Germany). LC-MS grade methanol, acetonitrile, acetic acid, acetone, and water were purchased from Merck Life Science (Merck KGaA, Darmstadt, Germany). All other chemicals were of analytical grade and obtained from Sigma (St. Louis, MO, USA).
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8

Cinnamic Acid Compound Procurement

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Cinnamic acid and methyl trans-cinnamate were purchased from Merck (VWR, Portugal). CTAB, cinnamyl alcohol, hydroCinnamic acid, α-methylhydroCinnamic acid, and α-methylCinnamic acid were purchased from Acros Organics (Portugal). LA, cinnamaldehyde, allyl cinnamate, and α-fluoroCinnamic acid were purchased from Sigma (Portugal). Cinnamamide was purchased from Alfa Aesar (VWR; Portugal). The CAS number of each chemical is provided in Table 2.
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9

Synthesis and Solubilization of Phytochemicals

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Chalcone (Sigma-Aldrich, St. Louis, MO, USA), juglone (Sigma-Aldrich, St. Louis, MO, USA), cinnamic acid (Merck, Darmstadt, Germany), trigonelline (Sigma-Aldrich, St. Louis, MO, USA), guaiazulene (Sigma-Aldrich, St. Louis, MO, USA), α-bisabolol (Sigma-Aldrich, St. Louis, MO, USA), farnesol (Sigma-Aldrich, St. Louis, MO, USA) and nerolidol (Sigma-Aldrich, St. Louis, MO, USA) were purchased as pure compounds. Furvina and 2-nitrovinylfuran derivatives 1–4 were synthesized as previously described [19 (link),39 (link)]. Stock solutions of trigonelline were prepared in sterile distilled water, whereas for the remaining molecules, dimethyl sulfoxide (DMSO, 100%) was used as the solvent. For phytochemical-based molecules, serial dilutions from 1000 mg/L to 6.25 mg/L were prepared when needed. The percentage of DMSO never exceeded 10% (v/v) of the final volume.
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10

Quantifying Antioxidant Compounds in Samples

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Folin-Ciocalteu phenol reagent was obtained from Fluka. Standards (gallic acid, caffeic acid, cinnamic acid, ferulic acid, coumarin, rutin and kaempferol) were obtained from Merck Life Science (Merck KGaA, Darmstadt, Germany). In addition, 2,2-diphenyl-1-picrylhydrazyl (DPPH) and butylated hydroxytoluene (BHT) were purchased from Sigma (St. Louis, MO, USA). LC-MS grade methanol, acetonitrile, acetic acid, EtOAc, acetone and water were purchased from Merck Life Science (Merck KGaA, Darmstadt, Germany). All of the other chemicals were of analytical grade and obtained from Sigma (St. Louis, MO, USA).
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