Antioxidant Constituents Research Articles

Curcuma angustifolia ameliorates carbon tetrachloride-induced hepatotoxicity in HepG2 cells and Swiss albino rats

Objective: To determine the antioxidant and hepatoprotective potential of methanol extract of rhizome of Curcuma angustifolia (MECA) against carbon tetrachloride (CCl4)-induced hepatic damage in vitro and in vivo. Methods: DPPH, ABTS and reducing power assays were performed to estimate the antioxidant effect of MECA. In vitro cytotoxicity of MECA against HepG2 cells was evaluated, whereas serum biochemical parameters and levels of antioxidative enzymes were measured in vivo and in vitro. Additionally, histopathological studies were estimated in order to investigate the hepatoprotective efficacy of MECA. Furthermore, GC-MS analysis of the extract was performed to identify the chemical components. Results: MECA exhibited strong antioxidant activity and attenuated CCl4-induced decrease in the viability of HepG2 cells. Additionally, MECA significantly restored the ALT, AST, ALP, TP and albumin level in comparison with the CCl4 group. After pre-treatment with MECA, effects of SOD, CAT and GSH were increased as well as lipid peroxidation amount decreased on CCl4-induced hepatotoxicity in in vitro and in vivo model. Furthermore, histopathological observation confirmed that MECA reduced liver injury induced by CCl4 in rats. GC-MS analysis confirmed the presence of bioactive constituents such as α-tocopherol (12.27%), phytol (7.61%), squalene (3.71%), β-sitosterol (2.19%), eugenol (2.59%), curcumenol (1.20%), β-elemene (1.00%) and eucalyptol (0.89%). Conclusions: MECA contains antioxidant and hepatoprotective constituents such asa-tocopherol, phytol, squalene and eugenol and exerts hepatoprotective effect both in vitro and in vivo.

Natural antioxidants of plant origin.

Interest in the content of natural antioxidants in plant-based foods can be from the human health perspective, in terms of how these compounds might help promote one's health and wellness, or from the storage point-of-view, as the endogenous antioxidant constituents aid to extend a foodstuff's shelf-life. This chapter reports essential information about the mechanism of antioxidant action and methods employed for determination of their activity, classes of phenolic compounds (phenolic acids, flavonoids, lignans, stilbenes, tannins), sources of plant antioxidants (oil seeds, cereals, legumes, plants of the Lamiaceae family, tea and coffee, tree nuts, fruits, and berries), extraction strategies of phenolic compounds from plant material, and the influence of processing and storage on the content of natural antioxidants in foods and their antioxidant activity. Thermal processing, if not releasing bound phenolics from the structural matrices of the food, tends to decrease the antioxidant potential or, in the best case scenario, has no significant negative impact. Gentler sterilization processes such as high-pressure processing tend to better retain the antioxidant potential of a foodstuff than thermal treatments such as steaming, boiling, or frying. The impact of processing can be assessed by determining the antioxidant potential of foodstuffs either at the point of formulation or after different periods of storage under specified conditions.

Antioxidant and phytochemical analysis of volatile oil and extracts of Pinus wallichiana

The present study aims to explore the chemical constituents and antioxidant potential of Pinus wallichiana essential oil and extracts. Chemical composition of the essential oil was analyzed by GC-MS and result showed that the oil contain three major monoterpene compounds viz. α-pinene (48.6%), β-pinene (45.6%) and limonene (5.6%). Antioxidant potential of Pinus wallichiana was analyzed by three basic methods; DPPH radical scavenging method, FRAP assay and Fe2+ ion chelating activity. Among leaf and bark extracts, best radical scavenging, activity was determined by aqueous extract (IC50 values 20.83±0.8µg/ml) of bark followed by its methanol extract (IC50 value 25.9±1.6µg/ml). The aqueous extract of bark also exhibited better reducing and chelating activity than leaf extracts. Essential oil showed moderate radical scavenging and chelating activity but negligible reducing activity. Phytochemical analysis of extracts determined that the aqueous and methanol extracts of bark contain rich amount of poly phenol and flavonoids, in comparison to the leaf extracts. A significant correlation between the antioxidant activity and these phytoconstituents of the extracts has been observed. The results of the present study concluded that the bark of Pinus wallichiana is a potential source of active antioxidant constituents that could be further explored and exploited for numerous commercial applications.

Technical factors affecting dried herbal tea production from artichoke (Cynara scolymus) capitula

Medicinal plants and vegetable are a promising natural source of hepatoprotective, hypolipidemic and antioxidant constituents. Artichoke (Cynara scolymus) is of considerable economic importance for farmers in Lam Dong province, Vietnam. Artichoke (Cynara scolymus) is a vegetable rich in bioactive polyphenol compounds mainly cynarin, luteolin and chlorogenic acid flavonoids and dietary fibers, vitamins and minerals. Artichoke is difficult to store once it's harvested because of the rapid onset of rotting. Rotting is generally caused by microorganisms, especially molds that grow in high moisture conditions. Therefore, objective of this study focused on the effect of blanching temperature and time; heat pump drying temperature and storage condition to total phenolic content and sensory score of the dried artichoke (Cynara scolymus) tea. Results showed that C. scolymus should be blanched in hot water 95°C at 10 sec in ascorbic acid 0.5% and then being dried by heat pump dryer at 40°C until 8% moisture. The final herbal tea could be preserved under vacuum in PET/AL/PE bag at 4°C to maintain total phenolic content for 12 months.

Bioactivity-Guided Purification of Novel Herbal Antioxidant and Anti-NO Compounds from Euonymus laxiflorus Champ.

Euonymus laxiflorus Champ., a medicinal herb collected in Vietnam, has been reported to show several potent bioactivities, including anti-NO, enzyme inhibition, hypoglycemic and antidiabetic effects. Recently, the antioxidant activity of Euonymus laxiflorus Champ. trunk bark (ELCTB) has also been reported. However, the active antioxidant and anti-NO constituents existing in ELCTB have not been reported in the literature. The objective of this study was to purify the active antioxidants from ELCTB and investigate the anti-NO effect of the major constituents. Twenty-two phenolics isolated from ELCTB, including 12 compounds newly isolated in this study (1–12) and 10 constituents obtained from our previous work, were evaluated for their antioxidant activity. Of these, 12 compounds (4–6, 9, 13–15, 18–22) showed a potent antioxidant capacity (FRS50 = 7.8–58.11 µg/mL), in comparison to α-tocopherol (FRS50 = 23 µg/mL). In the anti-NO activity tests, Walterolactone A (1a) and B (1b) β-d-glucopyranoside (13) demonstrated the most effective and comparable activity to that of quercetin with max inhibition and IC50 values of 100%, 1.3 µg/mL, and 100%, 1.21 µg/mL, respectively. The crude extract and its major compounds showed no cytotoxicity on normal cells. Notably, three constituents (9, 11, and 12) were identified as new compounds, another three constituents, including 1, 7, and 8, were found to be new natural products, constituents 9 and 13 were determined to be new antioxidants, and compound 13 was reported to have novel potent anti-NO activity for the first time. The results of this study contribute to the enrichment of new natural products and compounds, as well as the novel biological activity of constituents isolated from Euonymus laxiflorus Champ. The current study also indicates ELCTB as a rich natural source of active phenolics. It is suggested that ELCTB could be developed as a health food with promising antioxidant and anti-NO effects, as well as other beneficial biological activities.

Supercritical CO₂ Extraction of Eruca sativa Using Cosolvents: Phytochemical Composition by LC-MS Analysis.

Background: Eruca sativa Mill. is a good source of glucosinolates (GLS), phenolic compounds and unsaturated fatty acids, being a valuable material for the production of functional-foods or nutraceutical ingredients. Extraction by supercritical CO2 (SCO2) can be used and the limitations due to the apolar nature of CO2 can be overcome using co-solvents. In this paper different cosolvents and conditions were used for SCO2 extraction and the composition of the obtained extracts was studied by LC-MS. Results: Water resulted the ideal co-solvent, allowing the extraction of glucosinolates in comparable amounts to the classical procedure with boiling water, as it can be carried out at mild temperatures (45 °C vs. >100 °C). Increasing the pressure improved the GLS extraction. On the other hand polyphenol extraction under the studied conditions was not influenced by pressure and temperature variations. The in vitro antioxidant effect of the obtained extracts was also measured, showing significant activity in the DPPH and FC tests. Conclusions: The GLS, flavonoids and lipids composition of the obtained extracts was studied, showing the presence of numerous antioxidant constituents useful for nutraceutical applications. The extraction method using SCO2 and water as co-solvent presents advantages in terms of safety because these solvents are generally recognised as safe. Water as cosolvent at 8% resulted useful for the extraction of both glucosinolates and phenolics in good amount and is environmentally acceptable as well as safe for food production.

Rapid purification of antioxidants from Magnolia officinalis by semi-prep-HPLC with a two-step separation strategy guided by on-line HPLC-radical scavenging detection

A rapid and accurate strategy of screening, identification, and purification of antioxidants from natural medicines was put forward in this work, and it was applied to discover the antioxidants from magnolia officinals Rahd. et Wils. On-line HPLC-DPPH combined with electrospray ionization time-of-flight mass spectrometry was employed for the rapid screening and potential identification of the antioxidants. Semi-prep-HPLC with two-step separation procedure was employed for the separation and purification of the representative compounds (the first step: compounds 1–4 were obtained by gradient elution; the second step: compounds 5–7 were obtained by isocratic elution). NMR spectroscopy, mass spectrometry, and UV spectroscopy were used for further structural identification, and the activity of the compounds was verified by in vitro assay. With this method, 28 compounds with antioxidant activity were discovered in the extraction. After the preparation and purification, seven compounds with the purity over 95% were get, which were identified as syringing, magnoloside B, magnoloside A, magnoloside F, magnolol, obvatol and honokiol. The results of in vitro assay showed that these seven compounds all had higher DPPH scavenging activity. Thus, all the results suggested that this work provide a more rapid, accurate and efficient methodology to achieve the screening, characterization and preparation of antioxidative constituents from complex natural products under active guidance.

Comparative Analysis of Polyphenolic and Antioxidant Constituents in Dried Seedlings and Seedless Acacia nilotica Fruits

The phenolic and antioxidant constituents in Acacia nilotica fruits have become an important source of medicinal and therapeutic benefit with powerful biological properties. This study investigated the phenolic content and antioxidant capacity of powdered Acacia fruits with seeds and without seeds. The phenolic content and antioxidant capacities in them were determined using Folin–Ciocalteu and DPPH free radical-scavenging assays. The total phenolic and antioxidants of A. nilotica with seeds were spectrophotometrically determined to be 47.61 and 6.18% greater than when the seeds were removed from the dried fruits, respectively. The LC–MS/QTOF analysis shows the presence of 282 and 214 phenolic compounds in the methanol extracts of A. nilotica with seeds and without seeds, respectively. The present study, therefore, revealed that dried A. nilotica fruits with seeds have higher total phenolic content, antioxidant capacity, and bioactive constituents, which indicated that they have more medicinal value than fruits without seeds.

An unreported polyether macrocyclic lactone with antioxidative and anti-lipoxygenase activities from the Babylonidae gastropod mollusc Babylonia spirata

A 16-member polyether macrocyclic lactone, with previously unreported framework was isolated as a result of the bioassay guided chromatographic fractionation of the ethyl acetate-methanol extract of the Babylonidae Babylonia spirata collected from the southwestern coast of Indian peninsular. The compound was characterized as 10, 14-dihydroxy-4-(1′-propyl-1′(Z)-hexen-1′-yl)-7, 12-dioxapentadecanolide based on extensive spectral data analysis. The antioxidant activities evaluated by in vitro free radical scavenging capacities reported that the studied compound possessed greater activity (IC50 0.058–0.065 × 10−2 M) than the commercial standards, butylated hydroxy anisole, butylated hydroxyl toluene and α-tocopherol (IC50 0.118–0.189 × 10−2 M). The compound was found to possess greater anti-inflammatory potentials as recognized by its lower IC50 value for the 5-lipoxygenase inhibition assay (0.073 × 10−2 M) than the non steroidal anti-inflammatory drugs aspirin (0.211 × 10−2 M) and ibuprofen (0.436 × 10−2 M). Structure-activity studies showed that bioactivities of the polyether macrocyclic lactone were directed by electronic and lipophilic descriptors. The lipophilic parameter of octanol-water partition coefficient (log Pow) of the studied compound recorded a value as low as 2.76 when judged against commercial antioxidant α-tocopherol (log Pow 9.98), and was recognized as a primary physico-chemical descriptor dictating the antioxidant characteristics of the isolated polyether macrocyclic lactone, whereas the electronic parameters appeared to contribute towards its anti-inflammatory activity. This is the first report of the occurrence of macrocyclic lactone featuring a dioxapentadecanolide framework possessing potential antioxidative and anti-inflammatory activities, and therefore, anticipated as a potential naturally-derived antioxidative and anti-inflammatory constituent in functional food and pharmaceutical applications.

Cultivar-specific responses in red sweet peppers grown under shade nets and controlled-temperature plastic tunnel environment on antioxidant constituents at harvest

Antioxidant constituents such as carotenoids (capsanthin, phytoene, lutein, β-cryptoxanthin), polyphenols content (p-coumaric, ferulic, p-hydroxybenzoic, caffeic acid, sinapic acid, and quercetin-3-glucoside) and marketable yield were investigated in 11 sweet pepper cultivars grown under controlled temperature plastic tunnel and white shade net. Marketable yield was not affected by either of the environments, while the interaction between cultivar and growing environment significantly affected the accumulation of antioxidant constituents. The principal component analysis illustrated that controlled temperature plastic tunnel improved the accumulation of carotenoid components and ascorbic acid and vitamin C content in most cultivars. On the contrary, white shade nets favoured the accumulation of phenolic compounds and ORAC activity in most cultivars. A strong correlation was noted between phytoene and carotenoid components in this study (capsanthin r = 0.60; P < 0.001; lutein r = 0.75; P < 0.001; β-carotene r = 0.78; P < 0.001) while ORAC correlated with phenolic compounds. Based on this study, it is possible to refine the choice of environment and cultivar to enhance individual antioxidant constituent groups to improve health benefits for consumers.

Brachychiton populneus (Schott & Endl.) R.Br. ameliorate carbon tetrachloride induced oxidative stress through regulation of endoplasmic reticulum stress markers and inflammatory mediators in Sprague-Dawley male rats

In this study hepatoprotective aptitude of Brachychiton populneus against carbon tetrachloride (CCl4) instigated liver injuries in rats was investigated. High-performance liquid chromatography (HPLC) with a diode array detector (DAD) analysis of methanol extract of B. populneus (BPM) indicated existence of rutin, catechin and myricetin. Administration of CCl4 to rat decreased (p < 0.01) the level of catalase (CAT), total superoxide dismutase (SOD), peroxidase (POD), soluble protein and reduced glutathione (GSH) whereas elevated the concentration of H2O2, thiobarbituric acid reactive substances and nitrite in hepatic samples. In serum the level of hepatic markers; aspartate transaminase, alanine transaminase, alkaline phosphatase and total bilirubin increased with CCl4 treatment against control animals. In hepatic samples the expression level of endoplasmic reticulum stress associated genes like glucose regulated protein (GRP78), x-box binding protein- 1 total (XBP-1 t), x-box binding protein- 1 spliced (XBP-1 s), x-box binding protein- 1 unspliced (XBP-1 u), glutamate-cysteine ligase catalytic subunit (GCLC) and pro-inflammatory cytokines; tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and monocyte chemoattractant protein-1 (MCP-1) was elevated many fold with CCl4 administration to rat. Co-administration of BPM along with CCl4 to rats decreased (p < 0.05) the expression of above genes except GCLC where expression level was enhanced as compared to CCl4 treatment. Histopathology of liver showed injuries of hepatocytes, infiltration of leukocytes and damaged central lobule in CCl4 treated rats. However, BPM administration to CCl4 intoxicated rats restored the altered parameters towards the control rats. These results suggested the presence of antioxidant and anti-inflammatory constituents in methanol extract of B. populneus.

In-vitro compositional investigations of antioxidants, phytochemicals, nutritional and minerals in the fruit of Kigelia africana (Lam.) Benth

The health problems in the third world and the attendant complications resulting into death of many people mostly caused by cancer, hypertension and other heart disorders primarily because of the inability to afford adequate health conditions and maintain balanced nutrition status has called for alternative means of attaining the required global Millennium Developmental Goals (MDGs) status on health and also to prevent mortality among all ages. This study therefore aimed at investigating the natural antioxidants, phytochemicals, proximate and mineral elements composition in fruit of Kigelia africana popularly known as the sausage tree as an indication for utilization in pharmaceutical for human and animals’ feed benefits. The results obtained for 2,2-diphenyl-1-picrylhydrazyl (DPPH), total phenolic content, total flavonoid, Ferric reducing antioxidant power (FRAP), phytochemical constituents, proximate and mineral elements compositions of the fruits revealed high percentage of antioxidant potentials, presence of medicinal important phytochemicals, good quantity of nutritional and medicinally important mineral elements. However, from the results of the study, the fruit of Kigelia africana can be exploited for medicine to heal many diseases and food additives in animals’ feed.

On-line screening and identification of free radical scavenging compounds in Angelica dahurica fermented with Eurotium cristatum using an HPLC-PDA-Triple-TOF-MS/MS-ABTS system

Eurotium cristatum, a beneficial fungus isolated from Fuzhuan tea, was used to ferment Angelica dahurica for the first time. The antioxidant capacities of the extracts before and after fermentation were compared using ABTS, DPPH and FRAP assays. The results showed that the antioxidant capacities of the extracts acquired using organic solvents were greater after fermentation. Moreover, based on a comparison of the HPLC chromatograms, the chemical composition of Angelica dahurica changed substantially during fermentation. To further understand the changes in its antioxidant constituents, an on-line HPLC-PDA-Triple-TOF-MS/MS-ABTS system was employed. Twelve antioxidants belonging to three different classes were detected and identified, and their antioxidant capacities were preliminarily evaluated. The results indicated that the substances produced during the fermentation of Eurotium cristatum played important roles in enhancing the antioxidant capacity.

Evaluation of potential anti-fibrotic effect of oleuropein on bleomycin-induced pulmonary fibrosis in rat

The etiology of idiopathic pulmonary fibrosis (IPF) is not well known, however it is a final response of frequent injuries to endothelial and epithelial cells that cause influx of the inflammatory cells. Bleomycin (BLM), a chemotherapeutic agent that causes lung fibrosis in human patients has been applied extensively in rodent models to inducing IPF. Moreover, oxidative stress and production of reactive oxygen species (ROS) have been involved in the pathogenesis. We aimed to investigate the effect of main olive antioxidant and anti-inflammatory polyphenol constituent, oleuropein (OLE), on BLM-induced fibrosis model. Female Wistar rats were divided into six groups (n = 8). In this study, whereas negative group only received vehicle and treatment groups received OLE (20, 40, and 80 mg kg−1) orally. Also, positive control group received intratracheally (IT), single dose BLM (7.5 U kg−1), prednisolone (10 mg/kg) as standard cure a week before and 3 weeks after IT-BLM. At 21th day of experiment, IL-13, TNF, TGF-β, and PDGF in the bronchoalveolar fluid (BALF), lung content hydroxyproline (HP), and malondialdehyde (MDA) were quantified. Histopathological changes in lungs were investigated too. IL-13, TNF, TGF-β1, PDGF in BALF, lung HP (collagen index), and MDA content in BLM-injected group was significantly higher than the control group (p < .05). In contrast, rats treated with OLE showed obviously lesser contents. Also, the histopathological observation confirms these findings. The results indicate that treatment by OLE may inhibit production of anti-inflammatory cytokines and ROS, and thus could be a useful medicine for managing fingagin disorders.

Isolation and Identification of the Anti-Oxidant Constituents from Loropetalum chinense (R. Brown) Oliv. Based on UHPLC⁻Q-TOF-MS/MS.

The aim of this study was to identify the chemical constituents of Loropetalum chinense (R. Brown) Oliv. (LCO) and determine which of these had antioxidant effects. The chemical composition of a 70% ethanol extract of LCO was analyzed systematically using UHPLC–Q-TOF-MS/MS. The chemical components of the 70% ethanol extract of LCO were then separated and purified using macroporous resin and chromatographic techniques. Antioxidant activity was evaluated using a DPPH assay. In total, 100 compounds were identified tentatively, including 42 gallic acid tannins, 49 flavones, and 9 phenolic compounds. Of these, 7 gallium gallate, 4 flavonoid and 8 quinic acid compounds were separated and purified from the 70% ethanol extract of LCO. The compounds identified for the first time in LCO and in the genus Loropetalum were 3,4,5-trimethoxyphenyl-(6′-O-galloyl)-O-β-d-glucopyranoside, protocatechuic acid, ethyl gallate, 5-O-caffeoylquinic acid, 3-O-caffeoylquinic acid, 3,5-O-diocaffeoylquinic acid, 4,5-O-diocaffeoylquinic acid and 3,4-O-diocaffeoylquinic acid. The 50% inhibitory concentration (IC50) values of compounds 1,2,3,4,6-penta-O-galloyl-β-d-glucose, gallic acid, protocatechuic acid, and ethyl gallate were 1.88, 1.05, 1.18, and 1.05 μg/mL, respectively. Compared with the control group (VC) (2.08 μg/mL), these compounds exhibited stronger anti-oxidation activity. This study offered considerable insight into the chemical composition of LCO, with preliminary identification of the antioxidant ingredients.

Effects of collagen-derived bioactive peptides and natural antioxidant compounds on proliferation and matrix protein synthesis by cultured normal human dermal fibroblasts

Nutraceuticals containing collagen peptides, vitamins, minerals and antioxidants are innovative functional food supplements that have been clinically shown to have positive effects on skin hydration and elasticity in vivo. In this study, we investigated the interactions between collagen peptides (0.3–8 kDa) and other constituents present in liquid collagen-based nutraceuticals on normal primary dermal fibroblast function in a novel, physiologically relevant, cell culture model crowded with macromolecular dextran sulphate. Collagen peptides significantly increased fibroblast elastin synthesis, while significantly inhibiting release of MMP-1 and MMP-3 and elastin degradation. The positive effects of the collagen peptides on these responses and on fibroblast proliferation were enhanced in the presence of the antioxidant constituents of the products. These data provide a scientific, cell-based, rationale for the positive effects of these collagen-based nutraceutical supplements on skin properties, suggesting that enhanced formation of stable dermal fibroblast-derived extracellular matrices may follow their oral consumption.

Yiqi Huoxue Decoction attenuates ischemia/hypoxia-induced oxidative stress injury in H9c2 cardiomyocytes

Abstract Objective Yiqi Huoxue Decoction (YQHX) has been widely used for clinical treatment of ischemic heart disease. While oxidative stress plays a key role in the pathogenesis of ischemic heart disease, the function and molecular mechanism underlying antioxidative protective effects of YQHX on H9c2 cardiomyocytes against ischemia/hypoxia (I/H) have yet to be well clarified. Methods H9c2 cells were subjected to 12 h of hypoxia with serum-free conditions and then treated with or without YQHX (100–400 μg/mL). Cell viability was examined using a CCK-8 assay. Maleic dialdehyde (MDA) and superoxide dismutase (SOD) activity were detected using commercial kits. Intracellular reactive oxygen species (ROS) levels and mitochondrial membrane potential were measured using fluorescence microscopy and confocal laser-scanning microscopy, respectively. Ultrastructural details of mitochondria in H9c2 cells were observed using transmission electron microscopy. The antioxidative protective pathway was assessed by measuring mRNA and protein expression of Nrf2 and HO-1, as well as AMPK activation. Results I/H injury gradually induced oxidative stress. Treatment with YQHX significantly increased cell viability and reversed I/H-induced oxidative stress, including reducing the production of oxidative stress products (ROS and MDA), increasing SOD levels, improving mitochondrial morphology, and increasing mitochondrial membrane potential. YQHX was also observed to increase I/H-induced expression of Nrf2 and HO-1, and the activation effects of YQHX were blocked by an AMPK inhibitor. In addition, HPLC analysis showed that YQHX contained two active antioxidative constituents (calycosin and ferulic acid). Conclusion The results suggest that anti-oxidative effects exerted by YQHX in H9c2 cardiomyocytes may be linked to upregulation of the AMPK-mediated Nrf2/HO-1 pathway.

Antioxidant activity, neuroprotective properties and bioactive constituents analysis of varying polarity extracts from Eucalyptus globulus leaves

Eucalyptus globulus is employed as herbal tea and therapeutical purposes. In this work, it is investigated for first time the neuroprotective activities, based on antioxidant properties, of varying polarity extracts (acetone, ethanol and methanol) from E. globulus leaves and elucidate their main bioactive constituents. Methanol and acetone extracts contained the highest phenolic compounds amount and chlorogenic acid was the major compound identified by UPLC-ESI-MS/MS. Moreover, the three tested extracts showed significant antioxidant properties, varying their potency depending on the in vitro technique used. Furthermore, E.globulus extracts were effective in ameliorating H2O2-induced oxidative stress by increasing cell viability, GSH levels and antioxidant enzymes activity and, by decreasing ROS production and lipid peroxidation levels in SH-SY5Y cells. Taken together, E.globulus leaves extracts could be used as raw material for food and pharmaceutical supplements for their high content in antioxidant compounds with health benefits properties against oxidative stress.

Phenolic composition, antioxidant, antibacterial and anti-inflammatory activities of leaf and stem extracts from Cryptotaenia japonica Hassk

ABSTRACT Cryptotaenia japonica Hassk. is a traditional medicinal plant in China to treat different diseases, as well as an edible leafy vegetable, but its biological functions is unknown. This study aimed to evaluate the antioxidant, antibacterial and anti-inflammatory activities of different phenolic extracts/fractions, which prepared with four kinds of methods and three kinds of polar solvent from Cryptotaenia japonica Hassk. leaf and stem. DPPH, ABTS, and reducing power assays were used to evaluate their antioxidant activity; antibacterial activity assay was assessed by Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and β-hemolytic streptococcus; inflammatory cytokine secretions were detected by ELISA assay. UPLC-ESI-MS/MS was used to identify the phenolics compounds. Compared with other extracts/fractions, the ethyl acetate fraction (EAF) had the highest amount of total phenolic and total flavonoids. It also exhibited strong DPPH, ABTS radical scavenging activities, reducing power, and antibacterial activity. This fraction also exhibited greater inhibitory effects on secretion of inflammatory cytokines. Six kinds of phenolic acid compounds from Cryptotaenia japonica Hassk. were indentified and luteolin (106806.1 μg/g dried weight, DW), apigenin (13780.8 μg/g DW) and p-coumaric acid (8004.8 μg/g DW) are main compounds. The results suggest that Cryptotaenia japonica Hassk. is a promising source of natural antioxidant, antibacterial and anti-inflammatory constituents for application in the food and pharmaceutical industries.

Bioassay-guided fractionation of Artocarpus heterophyllus L. J33 variety fruit waste extract and identification of its antioxidant constituents by TOF-LCMS

We have previously reported on the antioxidant potential of Artocarpus heterophyllus J33 (AhJ33) variety fruit waste from different extraction methods. In the study, the rind maceration extract (RDM) exhibited the highest phenolic and polyphenolic contents and strongest antioxidant potential measured by the DPPH assay (R2 = 0.99). In this paper, we now report on the bioassay-guided fractionation of the active ethyl acetate (EtOAC) fraction of RDM and its TOF-LCMS analysis. Seven sub-fractions resulting from the chromatographic separation of the EtOAC fraction showed radical scavenging activities between 80 and 94% inhibition. Subsequent LCMS analysis led to the identification of fifteen compounds comprising 5 phenolics and 10 non-phenolic compounds, 11 of which are reported for the first time from AhJ33 variety. Most of the identified compounds have been reported to possess antioxidant activity in many previous studies. This indicates that AhJ33 is a promising source of antioxidants for the development of food and nutraceutical products.