scholarly journals Relevance and Standardization of In Vitro Antioxidant Assays: ABTS, DPPH, and Folin–Ciocalteu

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Helena Abramovič ◽  
Blaž Grobin ◽  
Nataša Poklar Ulrih ◽  
Blaž Cigić
Keyword(s):  
Ascorbic Acid ◽  
Chlorogenic Acid ◽  
Gallic Acid ◽  
Caffeic Acid ◽  
Sulfonic Acid ◽  
Epigallocatechin Gallate ◽  
The Other ◽  
Oh Groups ◽  
Standard Compound

Trolox, gallic acid, chlorogenic acid, caffeic acid, catechin, epigallocatechin gallate, and ascorbic acid are antioxidants used as standards for reaction with chromogenic radicals, 2,2-diphenyl-1-picrylhydrazyl (DPPH⋅) and 2,2′-azino-bis-3-ethylbenzotiazolin-6-sulfonic acid (ABTS⋅+), and Folin–Ciocalteu (FC) reagent. The number of exchanged electrons has been analyzed as function of method and solvent. A majority of compounds exchange more electrons in FC assay than in ABTS and DPPH assays. In reaction with chromogenic radicals, the largest number of electrons was exchanged in buffer (pH 7.4) and the lowest reactivity was in methanol (DPPH) and water (ABTS). At physiological pH, the number of exchanged electrons of polyphenols exceeded the number of OH groups, pointing to the important contribution of partially oxidized antioxidants, formed in the course of reaction, to the antioxidant potential. For Trolox, small impact on the number of exchanged electrons was observed, confirming that it is more suitable as a standard compound than the other antioxidants.

scholarly journals In vitro and in vivo antioxidant properties of chlorogenic acid and caffeic acid

2011 ◽  
Vol 403 (1-2) ◽  
pp. 136-138 ◽  
Author(s):  
Yuki Sato ◽  
Shirou Itagaki ◽  
Toshimitsu Kurokawa ◽  
Jiro Ogura ◽  
Masaki Kobayashi ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Antioxidant Properties

scholarly journals Phytochemicals and In-Vitro Antioxidant Activities of Aloe Vera Gel

2020 ◽  
Vol 44 (1) ◽  
pp. 33-41
Author(s):  
Md Nazim Uddin ◽  
Subrata Chandra Roy ◽  
Abdulla All Mamun ◽  
Kanika Mitra ◽  
Md Zahurul Haque ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Aloe Vera ◽  
The Other ◽  
Total Phenolic ◽  
Antioxidant Power ◽  
Aloe Vera Gel ◽  
Gallic Acid Equivalent

The phytochemicals (total phenolic, tannin, flavonoid, alkaloid, and saponin) contents in the Aloe vera gel derived from the leaf of Aloe vera (L.) Burm. f. (Synonym Aloe barbadensismiller) were extracted and their antioxidant capacity was studied by Ferric reducing antioxidant power assay (FRAP), by free radical-scavenging capability using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS). Three different solvents with three different polarities CH3OH, CH3OH: HCl, CH3CH3OH: H2O were used at v/v ratio of 100, 98:2, 70:30, respectively. The acidified methanol solvent extracted the highest amounts of phytochemicals including total phenolic (4.64 mg gallic acid equivalent/g), tannin (3.84 mg tannic acid equivalent/g), alkaloid (662 mg piperine equivalent/g), and saponin (353 mg diosgenin equivalents/g) compared to the other two solvents. Similarly, in the extract with acidified methanol solvent, high level of total antioxidant activity (about 12 mg gallic acid equivalent/g) and scavenging effects expressed as 50% inhibition concentrations (IC50) for DPPH and ABTS assay were determined to be about 61 μg/mL and 371 μg/mL, respectively, which are higher than those with the other two solvents. The gel extract could be used as a potent antioxidant in medicine and food industries. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 1, 33-41, 2020

scholarly journals Cinnamides Target Leishmania amazonensis Arginase Selectively

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5271
Author(s):  
Edson Roberto da Silva ◽  
Júlio Abel Alfredo dos Santos Simone Come ◽  
Simone Brogi ◽  
Vincenzo Calderone ◽  
Giulia Chemi ◽  
...  
Keyword(s):  
Caffeic Acid ◽  
Selective Inhibition ◽  
Leishmania Amazonensis ◽  
The Other ◽  
Computational Investigation ◽  
Weak Inhibitor ◽  
Starting Point ◽  
Insight Into ◽  
Caffeic Acid Phenethyl Amide

Caffeic acid and related natural compounds were previously described as Leishmania amazonensis arginase (L-ARG) inhibitors, and against the whole parasite in vitro. In this study, we tested cinnamides that were previously synthesized to target human arginase. The compound caffeic acid phenethyl amide (CAPA), a weak inhibitor of human arginase (IC50 = 60.3 ± 7.8 μM) was found to have 9-fold more potency against L-ARG (IC50 = 6.9 ± 0.7 μM). The other compounds that did not inhibit human arginase were characterized as L-ARG, showing an IC50 between 1.3–17.8 μM, and where the most active was compound 15 (IC50 = 1.3 ± 0.1 μM). All compounds were also tested against L. amazonensis promastigotes, and only the compound CAPA showed an inhibitory activity (IC50 = 80 μM). In addition, in an attempt to gain an insight into the mechanism of competitive L-ARG inhibitors, and their selectivity over mammalian enzymes, we performed an extensive computational investigation, to provide the basis for the selective inhibition of L-ARG for this series of compounds. In conclusion, our results indicated that the compounds based on cinnamoyl or 3,4-hydroxy cinnamoyl moiety could be a promising starting point for the design of potential antileishmanial drugs based on selective L-ARG inhibitors.

scholarly journals Anti-malarial Activity Of Phenolic Acids Is Structurally Related

2020 ◽  
Author(s):  
Prince A Fordjour ◽  
Jonathan P Adjimani ◽  
Bright Asare ◽  
Nancy O Duah-Quashie ◽  
Neils B Quashie
Keyword(s):  
Plasmodium Falciparum ◽  
Ferulic Acid ◽  
Chlorogenic Acid ◽  
Gallic Acid ◽  
Caffeic Acid ◽  
Phenolic Acids ◽  
Rosmarinic Acid ◽  
Protocatechuic Acid ◽  
Antimalarial Activity ◽  
Coumaric Acid

Abstract Background In the absence of an effective vaccine against malaria, chemotherapy remains a major option in the control of the disease. Then, the recent report of the emergence and spread of clones of Plasmodium falciparum resistant to available antimalarial drugs should be of concern as it poses a threat to disease control. Compounds whose pharmacological properties have been determined and touted for other disease can be investigated for antimalarial activity. Phenolic acids (polyphenols) have been reported to exhibit antioxidant, anticancer, anti-inflammatory, antiviral and antibiotic effects. However, information on their antimalarial activity is scanty. Phenolic acids are present in a variety of plant-based foods: mostly high in the skins and seeds of fruits as well as the leaves of vegetables. Systematic assessment of these compounds for antimalarial activity is therefore needed. Method Using the classical in vitro drug test, the antimalarial activities of five hydroxycinnamic acids, (caffeic acid, rosmarinic acid, chlorogenic acid, o-Coumaric acid and ferulic acid) and two hydroxybenzoic acids (gallic acid and protocatechuic acid) against 3D7 clones of Plasmodium falciparum was determined. Results Among the phenolic acids tested, caffeic acid and gallic acid were found to be the most effective, with mean IC 50 value of 17.73µg/ml and 26.59µg/ml respectively for three independent determinations. Protocatechuic acid had an IC 50 value of 30.08 µg/ml. Rosmarinic acid and chlorogenic acid, showed moderate antimalarial activities with IC 50 values of 103.59µg/ml and 105µg/ml respectively. The IC 50 values determined for ferulic acid and o-Coumaric acid were 93.36µg/ml and 82.23µg/ml respectively. Conclusion The outcome of this study suggest that natural occurring phenolic compounds have appreciable level of antimalarial activity which can be exploited for use through combination of actions/efforts including structural manipulation to attain an increase in their antimalarial effect. Eating of natural food products rich in these compounds could provide antimalarial prophylactic effect.

scholarly journals The Influence of Lactic Acid Bacteria from Xinjiang Traditional Fermented Yogurt on Antioxidation of Geniposide in vitro

2020 ◽  
Vol 185 ◽  
pp. 04005
Author(s):  
Rui Xue ◽  
Mei Wang ◽  
Dengqiu Liu ◽  
Xin Zhao ◽  
Bihui Liu
Keyword(s):  
Lactic Acid ◽  
Free Radicals ◽  
Lactic Acid Bacteria ◽  
Sulfonic Acid ◽  
Potential Method ◽  
Antioxidant Effect ◽  
The Other ◽  
Scavenging Activity ◽  
Hydroxyl Free Radicals

To investigate the influence of lactic acid bacteria on the antioxidant effect of geniposide in vitro, seven strains of lactic acid bacteria were isolated from natural fermented yoghurt from Xinjiang, China. Lactic acid bacteria, geniposide and their mixtures were used separately to evaluate the antioxidant effect through detecting the scavenging activity of 1,1-diphenyl-2-trinitrophenylhydrazine (DPPH), Hydroxyl free radicals and 2, 2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS). The results showed that, compared with the group that geniposide separately used, the strains numbered x70-1, x70-2, x70-3, x70-4 and x70-5, combined with geniposide had more remarkable antioxidant effect, while the other two strains (numbered x43-2 and x43-3)combined with geniposide showed low oxidation resistance. These results may provide a potential method to promote antioxidant effect of geniposide.

scholarly journals Changes of Polyphenol Compound Concentrations in Hybrids of Nante Type Carrots during Storage

2017 ◽  
Vol 71 (6) ◽  
pp. 492-495 ◽  
Author(s):  
Ingrīda Augšpole ◽  
Tatjana Kince ◽  
Ingmārs Cinkmanis
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Ferulic Acid ◽  
Chlorogenic Acid ◽  
Gallic Acid ◽  
Caffeic Acid ◽  
High Performance ◽  
Polyphenol Compounds ◽  
Polyphenol Compound

Abstract The main purpose of the study was to determine changes of polyphenol concentrations in hybrids of Nante type carrots during storage. Fresh Nante type ‘Forto’ variety carrots and carrot hybrids ‘Bolero’ F1, ‘Champion’ F1, and ‘Maestro’ F1 were cultivated in the Zemgale region of Latvia. Carrots were stored for six months in air (+3 ± 1 °C, RH = 89 ± 1%) and polyphenol compound concentrations were determined at two month intervals. High-performance liquid chromatography was used to determine concentrations of eight polyphenols in carrots: gallic acid, catechin, epicatechin, caffeic acid, chlorogenic acid, ferulic acid, vanillin, and rutin. Significant differences occurred in polyphenol concentrations of fresh Nante type variety ‘Forto’ carrots and several hybrids (‘Bolero’ F1, ‘Champion’ F1, and ‘Maestro’ F1) during storage. After six months of storage, the concentration of polyphenol compounds of Nante type carrots decreased — caffeic acid by 64.6%, chlorogenic acid — by 37.9% and vanillin — by 81.5%. However, during storage, concentration of some polyphenol compounds increased, as catechin by 30.5%, epicatechin by 85.2%, gallic acid by 48.5% and ferulic acid by 87.9%.

Perbandingan Metode Sterilisasi Untuk Perbanyakan Rubus rosifolius Secara in Vitro

2021 ◽  
Vol 14 (1) ◽  
pp. 127-137
Author(s):  
Muhammad Imam Surya ◽  
Lily Ismaini
Keyword(s):  
Tissue Culture ◽  
Ascorbic Acid ◽  
In Vitro Propagation ◽  
Povidone Iodine ◽  
Tween 80 ◽  
Botanical Garden ◽  
The Other ◽  
Fruit Crops ◽  
Plant Propagation

AbstrakRubus rosifolius adalah salah satu jenis rasberi liar yang memiliki potensi cukup tinggi untuk dikembangkan sebagai tanaman buah. Selain itu, metode perbanyakan tanaman merupakan salah satu faktor yang berpengaruh dalam pembudidayaan. Lebih lanjut, informasi terkait upaya perbanyakan R. rosifolius secara in vitro masih sangat terbatas. Percobaan ini ditujukan untuk mengetahui metode sterilisasi yang tepat pada eksplan R. rosifolius. Sebanyak 17 metode sterilisasi telah diujicobakan di Laboratorium Kultur Jaringan BKT Kebun Raya Cibodas-LIPI. Bahan sterilisasi yang digunakan, yaitu detergen, tween 80, bakterisida, fungisida, clorox/pemutih (NaClO), alkohol 70%, larutan Plant Preservative Mixture (PPM), vitamin C/asam askorbat, dan povidone iodine/antiseptik. Hasil percobaan menunjukkan bahwa metode sembilan merupakan metode sterilisasi yang cukup optimum untuk sterilisasi eksplan R. rosifolius. Metode sembilan mampu menghambat munculnya mikroorganisme endofitik hingga 8 hari dan tidak menyebabkan warna eksplan menjadi cokelat/browning. Tahapan sterilisasi pada metode sembilan meliputi pencucian dengan detergen, perendaman dengan bakterisida + fungisida selama +30 menit, perendaman dengan clorox 10% + tween 80 selama +15 menit, pencucian dengan larutan PPM selama +15 menit.  AbstractRubus rosifolius is one of the species from wild raspberries, which is has high potential to develop as a fruit crops. In the other hand, the technique of plant propagation became an important factor for cultivation. Moreover, the information related to the in vitro propagation of R. rosifolius is very limited. This experiment was aimed to determine the best method to sterilize an explants of R. rosifolius. About 17 methods of sterilization have been tried in the laboratorium of tissue culture at Cibodas Botanical Garden-Indonesian Institute of Sciences. The combination of detergent, tween 80, bactericide, fungicide, sodium hypochlorite (NaClO), alcohol 70%, plant preservative mixture (PPM), ascorbic acid, and povidone iodine were used during the experiment. The results show that the method of sterilization number nine could be inhibit the emergence of endophytic organisms for eight days and keep an explant in green with a little brownish compared by the others methods. The method of sterilization number nine was consist of several steps i.e. wash by detergent, soak in bactericide + fungicide for +30 minutes, soak in sodium hypoclorite 10% + tween 80 for +15 minutes, wash by PPM solution for +15 minutes.

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