Antioxidant Activities of the Phenolic Extracts of Seed Oils and Seed Hulls of Five Plant Species

2009 ◽  
Vol 15 (5) ◽  
pp. 419-425 ◽  
Author(s):  
K.N. Seneviratne ◽  
R.T. Kotuwegedara
Keyword(s):  
Antioxidant Activity ◽  
Plant Species ◽  
Plant Extracts ◽  
Antioxidant Activities ◽  
Total Phenol ◽  
Seed Oils ◽  
Synthetic Antioxidants ◽  
Phenolic Substances ◽  
Clear Idea ◽  
Phenolic Extracts

Antioxidant activities of the phenolic extracts of seed oils and seed hulls of five plant species were compared with those of butylated hydroxyl toluene (BHT) solutions at comparable phenolic concentrations in order to understand the phenolic dependence of the antioxidant activity and to evaluate the potentials of these phenolic extracts as alternatives for synthetic antioxidants. For this purpose, colorimetrically determined total phenol contents of the plant extracts were adjusted to known concentrations by suitable dilutions and the solutions of BHT with comparable concentrations were prepared by diluting a stock solution. The correlations of the total phenol contents and o-diphenol contents with the antioxidant activities of the phenolic extracts were also tested. Antioxidant activities of the phenolic extracts from different plants varied even at equal total phenol concentrations. o-Diphenol contents showed better correlations with the antioxidant activities than total phenol contents. A clear idea about the antioxidant potentials and the dependence of antioxidant activities on the quality and the quantity of phenolic substances can be obtained by comparison of the antioxidant activities of different phenolic extracts at equal total phenol concentrations.

scholarly journals Comparison of free and bound phenolic compositions and antioxidant activities of leaves from different mulberry varieties

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Zhenjiang Wang ◽  
Cuiming Tang ◽  
Gengsheng Xiao ◽  
Fanwei Dai ◽  
Sen Lin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Chlorogenic Acid ◽  
Antioxidant Activities ◽  
Syringic Acid ◽  
Mulberry Leaves ◽  
Phenolic Substances ◽  
Further Development ◽  
Active Substances ◽  
Phenolic Extracts

AbstractMulberry leaves are used in traditional Chinese medicine and contain numerous active substances that are known to be beneficial for human health. The aim of this study was to investigate the phenolic compositions and antioxidant activities of the leaves from 23 mulberry cultivars. Qualitative LC-ESI-QTOF analysis revealed the presence of 11 phenolic compounds in the free phenolic extracts and 10 phenolic compounds in the bound fractions. Chlorogenic acid and caffeic acid were the major components in the free and bound fractions, respectively. The results revealed that the changguosang cultivar from Taiwan contained the greatest content of phenolic compounds as well as the highest antioxidant activity among the 23 cultivars examined, as determined using three separate antioxidant assays. The isoquercitrin, chlorogenic acid, and rutin contents of the free phenolic extracts displayed significant correlations with the antioxidant activities, while syringic acid and rutin were the main contributors to the antioxidant activities of the bound phenolic fractions. The obtained results demonstrate that mulberry leaves contain a variety of beneficial phenolic substances and may be suitable for further development as a herbal medicine.

scholarly journals Comparison of Free and Bound Phenolic Compositions and Antioxidant Activities of Leaves from Different Mulberry Varieties

2020 ◽  
Author(s):  
Zhenjiang Wang ◽  
Cuiming Tang ◽  
Gengsheng Xiao ◽  
Fanwei Dai ◽  
Sen Lin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Chlorogenic Acid ◽  
Antioxidant Activities ◽  
Syringic Acid ◽  
Mulberry Leaves ◽  
Phenolic Substances ◽  
Further Development ◽  
Active Substances ◽  
Phenolic Extracts

Abstract Mulberry leaves are used in traditional Chinese medicine and contain numerous active substances that are known to be beneficial for human health. The aim of this study was to investigate the phenolic compositions and antioxidant activities of the leaves from 23 mulberry cultivars. Qualitative LC-ESI-QTOF analysis revealed the presence of 11 phenolic compounds in the free phenolic extracts and 10 phenolic compounds in the bound fractions. Chlorogenic acid and caffeic acid were the major components in the free and bound fractions, respectively. The results revealed that the changguosang cultivar from Taiwan contained the greatest content of phenolic compounds as well as the highest antioxidant activity among the 23 cultivars examined, as determined using three separate antioxidant assays. The isoquercitrin, chlorogenic acid, and rutin contents of the free phenolic extracts displayed significant correlations with the antioxidant activities, while syringic acid and rutin were the main contributors to the antioxidant activities of the bound phenolic fractions. The obtained results demonstrate that mulberry leaves contain a variety of beneficial phenolic substances and may be suitable for further development as a herbal medicine.

scholarly journals EFFECTS OF FERMENTATION DURATION ON PHYSICOCHEMICAL AND ORGANOLEPTIC CHARACTERISTICS OF THREE AGARWOODS (Aquilaria) LEAVES TEA

2021 ◽  
Vol 9 (2) ◽  
pp. 73-82
Author(s):  
Anisa Leksono ◽  
◽  
Erni Sofia Murtini ◽  
Keyword(s):  
Antioxidant Activity ◽  
Water Content ◽  
Plant Species ◽  
Black Tea ◽  
Total Phenol ◽  
Pharmacological Effects ◽  
Organoleptic Characteristics ◽  
Randomized Design ◽  
Two Factors ◽  
Completely Randomized Design

Aquilaria is one of the plant genus-producing agarwood. Aquilaria leaves have pharmacological effects which the potential to be processed into black tea. The aim of this study is to determine the effect of fermentation duration on physicochemical and organoleptic characteristics of Aquilaria leaves tea. This study employed a Completely Randomized Design with two factors; the plant species (A. crassna, A. malaccensis, and A. subintegra) and fermentation duration (0 minutes, 70 minutes, and 90 minutes). Parameters analyzed including water content, total phenol, and antioxidant activity. Organoleptic tests were performed on the color, taste, and aroma of the brewed tea. The results summarized that A. subintegra had the highest total phenol and antioxidant activity, but the taste of the tea was not favored. A. crassna fermented 70 minutes and A. malaccensis fermented 0 minutes were the most preferred, but both have lower total phenol and antioxidant activity than A. subintegra.

scholarly journals Abortifacient and Antioxidant Activities of Avicennia marina

2015 ◽  
Vol 33 ◽  
pp. 12-26
Author(s):  
Muppaneni Srikanth ◽  
Battu Ganga Rao ◽  
Mallikarjuna Rao Talluri ◽  
T. Rajananda Swamy
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Free Radicals ◽  
Plant Extracts ◽  
Antioxidant Activities ◽  
Avicennia Marina ◽  
Standard Drug ◽  
Hydroalcoholic Extract ◽  
Pure Compounds ◽  
Post Implantation

The current study was intended to evaluate abortifacient and antioxidant activity of Avicennia marina leaves extracts. Abortifacient activity was evaluated in rats, compared with standard drug (Mifepristone) and antioxidant activity was evaluated by using three free radicals (Superoxide, Hydroxyl and DPPH) compared with Ascorbic acid. The extracts were showed pre implantation loss, post implantation loss of implantations and decreased the survival ration of foetuses. Among all extracts hydroalcoholic extract showed better activity. The selected plant extracts showed concentration dependent percentage inhibition of free radicals. Among three extracts hydroalcoholic extract showed better activity with IC50 values on superoxide, hydroxyl and DPPH radicals were 203μg, 237μg and 143μg. From the results obtained during the study it the hydroalcoholic extract was used for the isolation of pure compounds, and isolated the different compounds (β-sitosterol, Lupeol and Betulinic acid).

scholarly journals Improvement of Oxidative Stability and Microbial Shelf Life of Vanilla Cake by Coconut Oil Meal and Sesame Oil Meal Phenolic Extracts

2019 ◽  
Author(s):  
Chathuri Senanayake ◽  
Harshani Algama ◽  
Ruwani Wimalasekara ◽  
W. N. M. T. D. N. Weerakoon ◽  
Nimanthi Jayathilaka ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Oxidative Stability ◽  
Shelf Life ◽  
Chemical Stability ◽  
Coconut Oil ◽  
Sesame Oil ◽  
Colony Count ◽  
Synthetic Antioxidants ◽  
Microbial Spoilage ◽  
Phenolic Extracts

<p></p><p>Phenolic extracts of coconut oil meal (CME) and sesame oil meal (SME) were compared with synthetic antioxidants for the potential of improving shelf life of vanilla cake. CME maintained hexanal (product of chemical spoilage) levels below 0.3 mg/kg in cake up to 14 days. BHT- and SME-added cakes maintained hexanal levels below 2 mg/kg while control cake with no added antioxidants exceeded this level by day 14. Both CME and SME extended the microbial shelf life up to 13 days while control and BHT-added cake exceeded the maximum allowed colony count by day 7 and day 11 respectively. The results indicate that the onset of microbial spoilage of vanilla cake is faster than the chemical spoilage and addition of CME and SME extend both microbiological and chemical stability of cakes beyond day 7 during storage. Over 90% of the antioxidant activity of CME and SME retained after heating at 180 °C for 2 h. CME and SME are ideal thermally stable natural alternatives for synthetic antioxidants in vanilla cake. <br></p><br><p></p>

scholarly journals Antioxidant Activity of Plant Extracts from Colombian Coffee-Growing Eco-Region

2017 ◽  
Vol 13 (1) ◽  
pp. 56-59
Author(s):  
Aura M. Blandón ◽  
Oscar M. Mosquera ◽  
Antônio E. G. Sant’ana ◽  
Aldenir F. Dos Santos ◽  
Luana L. S. Pires
Keyword(s):  
Antioxidant Activity ◽  
Plant Species ◽  
Plant Extracts ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Antioxidant Potential ◽  
Dpph Assay ◽  
Methanolic Extracts ◽  
In Vitro Antioxidant Activity

The present study describes the in vitro antioxidant activity of methanol extracts of 34 plant species collected in the Colombian coffee-growing eco-region belonging to Euphorbiaceae, Piperaceae and Solanaceae families. The antioxidant properties of extracts were evaluated by determining radical scavenging power measured with a DPPH assay. The methanolic extracts of  Hyeronimia antioquiensis, Mabea montana, and Alchornea grandis species (Euphorbiaceae), presents EC50 values equal to 0.686, 12.35, and 13.01 µg/mL, respectively, showing high antioxidant potential.

scholarly journals Bioactivities of plant extracts collected in Halmahera, Indonesia: A bioprospection study of underexplored plant species

2021 ◽  
pp. 376-384
Author(s):  
Marlin Megalestin Raunsai ◽  
Kartika Dyah Palupi ◽  
Ahmad Fathoni ◽  
Andria Agusta
Keyword(s):  
Antioxidant Activity ◽  
Antibacterial Activity ◽  
Plant Species ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Total Phenolic ◽  
Antioxidant Agents ◽  
Ethanolic Extracts ◽  
Potential Sources ◽  
Weak Antibacterial Activity

The discovery of new antibiotics to overcome the growing resistance problem as well as the discovery of new natural, safe antioxidants to combat oxidative stress are still urgently needed. Medicinal plants are known to produce potential therapeutic substances which are more biologically selective than synthetic compounds. Therefore, we explored the bioactivities of 35 ethanolic extracts from 24 underexplored plant species collected in Halmahera, to find potential sources for antibacterial and antioxidant agents.  Dried plant parts were extracted using ethanol 96%. Thin layer chromatography-direct-bioautography (TLC-DB) and minimum inhibitory concentration (MIC) determination were used to evaluate the antibacterial effect. Antioxidant activity was determined against DPPH using TLC-DB and microdilution assay. Total phenolic content (TPC) was determined using Folin-Ciocalteu’s method. The ethanolic extracts exhibited moderate to weak antibacterial activity against Escherichia coli and Staphylococcus aureus. However, the leaf extract of Elaeocarpus dolichostylus, Elaeocarpus multiflorus, and Psychotria celebica as well as the stem bark extract of Elaeocarpus dolichostylus, Cinnamomum sintoc, and Garcinia latissima displayed very strong antioxidant activities against DPPH with AAI values between 4.60 to 13.42. A strong correlation between TPC and antioxidant activity with r = 0.8712 was observed. Despite the moderate to weak antibacterial activity, eight underexplored plant species exhibit strong antioxidant activities. A high correlation between TPC and antioxidant activity indicating a prominent role of phenolic compounds in the plants’ antioxidant properties. These findings indicate that collected plants from Halmahera are potential to be studied and developed further as the potential sources for novel antioxidants.

Phytochemical Analysis and Assessment of Biological Properties of Essential Oils Obtained from Thyme and Rosmarinus Species

2020 ◽  
Vol 21 (5) ◽  
pp. 414-424
Author(s):  
Amira Zaïri ◽  
Sahar Nouir ◽  
Mohamed A. Khalifa ◽  
Bouraoui Ouni ◽  
Houda Haddad ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Essential Oils ◽  
Traditional Medicine ◽  
Plant Species ◽  
Antioxidant Activities ◽  
Biological Properties ◽  
Gas Chromatography Mass Spectrometry ◽  
Phytochemical Analysis ◽  
Cytotoxic Potential ◽  
Thymus Algeriensis

Background: The plant species Thymus algeriensis (TA); Thymus capitatus (TC) and Rosmarinus officinalis (RO), are widely used in traditional medicine in Tunisia. The bioactivities of their essential oils have been also reported previously. The main objective of this work was to assess the phytochemical composition, the antioxidant activity, cytotoxic potential and the antibacterial, antifungal, of the essential oil (EO) of these plants. Methods: Gas chromatography–mass spectrometry (GC-MS) was used to identify and quantify the constituents of the tested EO, chemical tests and spectrophotometric methods were used for antioxidant activities and for the screening, the quantification of phytochemicals. The cytotoxic potential of the EO was checked using HCT 116 cultures. Extracts were evaluated for their antibacterial potential by the microdilution method. Antifungal activities were tested using the Poisoned food method against: Aspergillus niger and Aspergillus flavus. Results: The EO of tested plants presented several components, mainly monoterpenes and sesquiterpenes. Results revealed that T. capitatus EO is not toxic comparing to the other tested samples. Phenolic compounds were detected and this EO showed excellent antioxidant activity presenting dose dependent relationship. Regarding antimicrobial activity, T. capitatus EO, also had the highest inhibition against all tested bacteria and fungi. Conclusions: This study showed the importance of the bioactivities (antioxidant, antimicrobial, and safety potential) of EOs of the plant species TC, RO, and TA used in traditional medicine.

scholarly journals Phenolic Profile and Antioxidant Activity of Italian Monovarietal Extra Virgin Olive Oils

Antioxidants ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 161 ◽  
Author(s):  
Carmine Negro ◽  
Alessio Aprile ◽  
Andrea Luvisi ◽  
Francesca Nicolì ◽  
Eliana Nutricati ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Total Phenolic ◽  
Phenolic Profile ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Ic50 Values ◽  
Phenolic Profiles ◽  
Trolox Equivalent ◽  
Phenolic Substances

In the last years, the interest in Italian monovarietal oils has increased due to their specific organoleptic qualities. Extra virgin olive oils (EVOOs) are rich in phenolic compounds, secondary metabolites well known and studied for their nutraceutical properties. However, among EVOOs, there is great variability in phenolic composition due to the origin, the production technique, and mainly, the genotype. The aim of this work was to evaluate the different phenolic profiles and the antioxidant activities of monovarietal oils. The results confirm this variability. In fact, the overall content of oleuropein varies up to four times between the different genotypes (from 33.80 to 152.32 mg/kg oil), while the oleocanthal content is significant only in two oils. The antioxidant activity, determined with 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and oxygen radical absorbance capacity (ORAC) assays, is correlated with the content of total phenolic substances, with half maximal inhibitory concentration (IC50) values for the DPPH test ranging from 160 to 91 mg of oil, while the ORAC test shows values between 5.45 and 8.03 μmol Trolox equivalent (TE)/g oil.

scholarly journals Phenolic Compounds and Antioxidant Activity of Castanopsis phuthoensis and Castanopsis grandicicatricata

2016 ◽  
Vol 55 ◽  
pp. 77-87 ◽  
Author(s):  
Phung Thi Tuyen ◽  
Do Tan Khang ◽  
Luong The Minh ◽  
Truong Ngoc Minh ◽  
Pham Thi Thu Ha ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Antioxidant Capacity ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Total Phenolic ◽  
Phenolic Contents ◽  
Phenolic Extracts

In this study, total phenolic, flavonoid contents, antioxidant capacity, and phenolic compositions of Castanopsis phuthoensis and Castanopsis grandicicatricata (Fagaceae family) were investigated. It was found that bark extracts were rich of phenolic contents, whereas leaf extracts were abundant of flavonoids. The total phenolics varied from 11.20 to 35.47 mg gallic acid equivalent g-1 dry weight (DW), and the total flavonoids were from 2.24 to 12.55 mg rutin equivalent g-1 DW. The results of antioxidant activity showed that the DPPH (1,1-diphenyl-2-picryl-hydrazyl) radical scavenging activity of the free phenolic extracts were higher than the bound phenolic extracts. Regarding the reducing power and β-carotene bleaching assays, the free phenolic extracts showed remarkably strong antioxidant capacity that were similar to the levels of the standard BHT (dibutyl hydroxytoluene) did. It could be concluded that free phenolic extracts were more effective in antioxidant activities than bound phenolic extracts. A highly significant correlation between phenolic contents and antioxidant activity in extracts were observed. By HPLC analysis, seven phenolic acids were detected including gallic, p-hydroxybenzoic, vanillic, sinapic, p-coumaric, ellagic, and vanillin. Of which, gallic, ellagic, and sinapic acids were the most abundant compounds in the two species. The results suggest C. phuthoensis and C. grandicicatricata contain rich sources of natural antioxidants and phenolic compounds which are probably considered in pharmaceutical use.

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