On Phosphotungstic-Phosphomolybdic Compounds as Color Reagents

Folin, Otto; Denis, W.

doi:10.1016/s0021-9258(18)88697-5

Cited by 1,020 publications

(97 citation statements)

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“…The content of total phenolic compounds was determined by the method of Folin and Denis [ 39 ], using gallic acid as a standard (mg gallic acid equivalents). The total crude saponin content of ginseng sprouts and 6-year ginseng roots was determined by the method of Hiai et al [ 40 ] with slight modification.…”

Section: Methodsmentioning

confidence: 99%

“…The conversion rate of CK from PPD type ginsenosides was calculated as the ratio of PPD equivalent, that is, PPD content of CK after enzyme reaction to the sum of PPD content of Rb1, Rb2, Rc, Rd and F2 before enzyme reaction. The content of total phenolic compounds was determined by the method of Folin and Denis [39], using gallic acid as a standard (mg gallic acid equivalents). The total crude saponin content of ginseng sprouts and 6-year ginseng roots was determined by the method of Hiai et al [40] with slight modification.…”

Section: Preparation Of Pge and Ckementioning

confidence: 99%

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Antioxidant, Anti-Inflammatory and Antithrombotic Effects of Ginsenoside Compound K Enriched Extract Derived from Ginseng Sprouts

2021

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Partially purified ginsenoside extract (PGE) and compound K enriched extract (CKE) were prepared from ginseng sprouts, and their antioxidant, anti-inflammatory and antithrombotic effects were investigated. Compared to the 6-year-old ginseng roots, ginseng sprouts were found to have a higher content of phenolic compounds, saponin and protopanaxadiol-type ginsenoside by about 56%, 36% and 43%, respectively. PGE was prepared using a macroporous adsorption resin, and compound K(CK) was converted and enriched from the PGE by enzymatic hydrolysis with a conversion rate of 75%. PGE showed higher effects than CKE on radical scavenging activity in antioxidant assays. On the other hand, CKE reduced nitric oxide levels more effectively than PGE in RAW 264.7 cells. CKE also reduced pro-inflammatory cytokines, such as tumor necrosis factor-α, interleukin (IL)-1β and IL-6 than PGE. Tail bleeding time and volume were investigated after administration of CKE at 70–150 mg/kg/day to mice. CKE administered group showed a significant increase or increased tendency in bleeding time than the control group. Bleeding volume in the CKE group increased than the control group, but not as much as in the aspirin group. In conclusion, ginseng sprouts could be an efficient source of ginsenoside, and CKE converted from the ginsenosides showed antioxidant, anti-inflammatory and antithrombotic effects. However, it was estimated that the CKE might play an essential role in anti-inflammatory effects rather than antioxidant effects.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Pge and Ckementioning

confidence: 99%

Antioxidant, Anti-Inflammatory and Antithrombotic Effects of Ginsenoside Compound K Enriched Extract Derived from Ginseng Sprouts

2021

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“…Total phenol contents were measured using the Folin-Denis method [23]. Samples (20 µL) were mixed with DMSO (1.58 mL) and Folin-Ciocalteu's phenol reagent (100 µL), and incubated at room temperature for 1 min, followed by the addition of sodium carbonate solution (20% v/v, 300 µL).…”

Section: Measurement Of Total Phenol Contentsmentioning

confidence: 99%

Antioxidant, Pancreatic Lipase Inhibitory, and Tyrosinase Inhibitory Activities of Extracts of the Invasive Plant Spartina anglica (Cord-Grass)

et al. 2021

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Since 2016, the invasive halophyte Spartina anglica has been colonizing mudflats along the western coast of South Korea. In order to minimize costs on S. anglica expansion management and waste-treatment of collected biomass, the potential application of the collected biomass of S. anglica was investigated. Ethanolic extracts and subfractions thereof (hexanes, methylene chloride, ethyl acetate, 1-butanol, and water-soluble) of the aerial and belowground parts of S. anglica showed free radical-scavenging [2,2-diphenyl-1-picrylhydrazyl (DPPH), and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS)], tyrosinase inhibitory, and pancreatic lipase inhibitory activities. An ethyl acetate fraction derived from aerial parts (EA-a) showed the most potent radical-scavenging and pancreatic lipase inhibitory activities, whereas tyrosinase inhibition was mainly observed in the methylene chloride soluble fractions (MC-bg) and other lipophilic fractions (ethyl acetate and hexanes layers) obtained from belowground parts. The major EA-a compound isolated and identified was 1,3-di-O-trans-feruloyl quinic acid (1) based on spectroscopic analysis, whereas the two major MC-bg compounds were identified as p-hydroxybenzaldehyde (2) and N-trans-feruloyltyramine (3). Compounds 1 and 3 scavenged both DPPH and ABTS radicals, whereas 1 and 2 inhibited pancreatic lipase activity. These results indicate that extracts and fractions of S. anglica have antioxidant, anti-obesity, and whitening properties with potential pharmaceutical, cosmeceutical, and functional food applications.

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“…The Folin-Denis method was used for analyzing total soluble polyphenols present in the quebracho extract [26,41,42]. The quebracho extract was dissolved in water at 20°C (0.5 g in 100 mL), left to equilibrate for 24 at 300 rpm and then filtered by filter paper Schleicher & Schuell 589 medium pore.…”

Section: Total Soluble Polyphenolsmentioning

confidence: 99%

Study of the anticorrosive properties of “quebracho colorado” extract and its use in a primer for aluminum1050

Byrne

Selmi

D'Alessandro

et al. 2020

Progress in Organic Coatings

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Tannins have been used to replace chromate in wash-primers as a temporary ("in transit") protection for metals. In the present work, the anticorrosive properties of "quebracho colorado" tannins were tested in water solution and in wash primers to protect aluminum alloy 1050. Polarization curves (linear and Tafel) and corrosion potential measurements were done on the alloy in contact with different concentrations of the tannin. A tannin wash primer was prepared and coated panels were tested in 100% humidity chamber (ASTM D 2247) and by electrochemical techniques (linear polarization curves, corrosion potentials and ionic resistances). Chromate and talc primers as well as no-coated aluminum alloy were also tested, as control, to compare the results.

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On Phosphotungstic-Phosphomolybdic Compounds as Color Reagents

Cited by 1,020 publications

References 0 publications

Antioxidant, Anti-Inflammatory and Antithrombotic Effects of Ginsenoside Compound K Enriched Extract Derived from Ginseng Sprouts

Antioxidant, Anti-Inflammatory and Antithrombotic Effects of Ginsenoside Compound K Enriched Extract Derived from Ginseng Sprouts

Antioxidant, Pancreatic Lipase Inhibitory, and Tyrosinase Inhibitory Activities of Extracts of the Invasive Plant Spartina anglica (Cord-Grass)

Study of the anticorrosive properties of “quebracho colorado” extract and its use in a primer for aluminum1050

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