Lipid Peroxidation Inhibition Assay Research Articles

Antioxidant Activity of Food Protein: Yellow Pea Protein Isolate NUTRALYS® S85F in a cell free Environment

In recent years, the demand for “all natural” products is increasing because of the increasing limitations on the use of synthetic antioxidants and enhanced public awareness of health issues. Many natural food components like oils and oilseeds, proteins and protein hydrolysates, fruits and vegetables, oat and rice bran, spices, herbs and tea have antioxidant properties. Natural antioxidants from these food components provide oxidative stability to the food product. The antioxidant activity of proteins is mainly due to interactions between their ability to inactivate reactive oxygen species, chelate pro-oxidative transition metals, scavenge free radicals, and reduction of hydroperoxides. The objective of this study was to verify the antioxidant potential of Pea Protein Isolate ‘NUTRALYS® S85F' through different in vitro tests: TOTAL ANTIOXIDANT RADICAL SCAVENGING ACTIVITY (ORAC ASSAY); SUPEROXIDE RADICAL SCAVENGING ACTIVITY (NBT ASSAY); LIPID PEROXIDATION INHIBITION ASSAY (MDA KIT); HYDROXYL RADICAL SCAVENGING ACTIVITY (HRS ASSAY); NITRIC OXIDE SCAVENGING ABILITY NUTRALYS® S85F clearly demonstrates intrinsic antioxidant activities as can be observed from its scavenging activity toward the peroxyl radicals (ORAC), scavenger of the superoxide radicals (NBT), hydroxyl radical scavenging (HRS), prevention of lipid oxidation (MDA) and nitric oxide scavenging (NO) capabilities. Based on our results, NUTRALYS® S85F will provide oxidative stability to food products and health benefits to the consumer.

Purification, Identification and Characterization of Antioxidant Peptides from Corn Silk Tryptic Hydrolysate: An Integrated In Vitro-In Silico Approach

Corn silk (CS) is an agro-by-product from corn cultivation. It is used in folk medicines in some countries, besides being commercialized as health-promoting supplements and beverages. Unlike CS-derived natural products, their bioactive peptides, particularly antioxidant peptides, are understudied. This study aimed to purify, identify and characterize antioxidant peptides from trypsin-hydrolyzed CS proteins. Purification was accomplished by membrane ultrafiltration, gel filtration chromatography, and strong-cation-exchange solid-phase extraction, guided by 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt radical cation (ABTS•+) scavenging, hydrogen peroxide scavenging, and lipid peroxidation inhibition assays. De novo sequencing identified 29 peptides (6–14 residues; 633–1518 Da). The peptides consisted of 33–86% hydrophobic and 10–67% basic residues. Molecular docking found MCFHHHFHK, VHFNKGKKR, and PVVWAAKR having the strongest affinity (−4.7 to −4.8 kcal/mol) to ABTS•+, via hydrogen bonds and hydrophobic interactions. Potential cellular mechanisms of the peptides were supported by their interactions with modulators of intracellular oxidant status: Kelch-like ECH-associated protein 1, myeloperoxidase, and xanthine oxidase. NDGPSR (Asn-Asp-Gly-Pro-Ser-Arg), the most promising peptide, showed stable binding to all three cellular targets, besides exhibiting low toxicity, low allergenicity, and cell-penetrating potential. Overall, CS peptides have potential application as natural antioxidant additives and functional food ingredients.

Antioxidant activities of hydro-methanolic extracts of Sri Lankan edible flowers

This study aims to investigate the total phenolics, carotenoid contents and antioxidant activity of twenty-eight edible flowers in Sri Lanka. DPPH radical scavenging assay, ferric reducing power assay (FRAP), total antioxidant capacity assay and lipid peroxidation inhibition assay were performed for methanolic extracts of flowers. Comparatively, higher phenolics, flavonoids, anthocyanin and carotenoid contents were observed in the extracts of Vinca rosea, Calendula officinalis, Lasia spinosa and Cassia auriculate flowers. Madhuca longifolia expressed the highest radical scavenging activity (81.9 ± 0.3%) followed by Calendula officinalis (80.3 ± 0.3%). Extracts of Punica granatum exhibited higher ferric reducing capacity. Significantly higher total antioxidant capacity and inhibition of lipid peroxidation was noted in Calendula officinalis. Pearson correlation analysis indicated a moderately stronger positive relationship between the phenolic content and reducing power (0.692) as well as total antioxidant capacity (0.689). These findings support the potency of edible flowers to combat oxidative stress and haul down the occurrence of chronic diseases.

Comparative assessment of α-amylase and α-glucosidase inhibition and in vitro antioxidant capacity of Garcinia schomburgkiana bark, fruit, and leaf extracts

Background: Garcinia schomburgkiana is a conventionally used as an herb for the treatment of diabetes, coughs, and menstrual disturbances. Objectives: The study was to examine in vitro antioxidant potentials and inhibitory effect against α-amylase and α-glucosidase of the bark, fruit, and leaf extracts of G. schomburgkiana using different traditional extraction methods and investigate the bioactive compound using spectroscopic and chromatographic techniques. Materials and Methods: The extracts were prepared by maceration with 80% ethanol and decoction with distilled water. The anti-free radical activities of the extracts were tested through decolorization of 2,2-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), and lipid peroxidation assays. The active compound was elucidated and quantified. Results: The ethanolic bark extract displayed the highest activities of DPPH, ABTS, lipid peroxidation, α-glucosidase, and α-amylase inhibition assays with EC50 values of 28.96 ± 1.62, 9.79 ± 0.14, 574.89 ± 14.68, 20.40 ± 1.33 and 2.81 ± 0.43 μg/mL, respectively. Thus, the ethanolic bark extract was selected to assess the bioactive compound by bioactivity-guided isolation. The active biflavonoid, named morelloflavone, was isolated and elucidated. Morelloflavone exhibited high activities comparable with positive controls (ascorbic acid and acarbose). Moreover, the content of morelloflavone from different extracts was analyzed by high-performance liquid chromatography. The bark maceration with ethanol yielded the highest contents of morelloflavone. Conclusion: The bark ethanolic extract of G. schomburgkiana has more potentials than other extracts. The isolated compound demonstrated the strong activities and could be the alternative source of natural antioxidants and α-amylase and α-glucosidase inhibitor.

Crystal Structure, Spectroscopic Characterization, Antioxidant and Cytotoxic Activity of New Mg(II) and Mn(II)/Na(I) Complexes of Isoferulic Acid.

The Mg(II) and heterometallic Mn(II)/Na(I) complexes of isoferulic acid (3-hydroxy-4-methoxycinnamic acid, IFA) were synthesized and characterized by infrared spectroscopy FT-IR, FT-Raman, electronic absorption spectroscopy UV/VIS, and single-crystal X-ray diffraction. The reaction of MgCl2 with isoferulic acid in the aqueous solutions of NaOH resulted in synthesis of the complex salt of the general formula of [Mg(H2O)6]⋅(C10H9O4)2⋅6H2O. The crystal structure of this compound consists of discrete octahedral [Mg(H2O)6]2+ cations, isoferulic acid anions and solvent water molecules. The hydrated metal cations are arranged among the organic layers. The multiple hydrogen-bonding interactions established between the coordinated and lattice water molecules and the functional groups of the ligand stabilize the 3D architecture of the crystal. The use of MnCl2 instead of MgCl2 led to the formation of the Mn(II)/Na(I) complex of the general formula [Mn3Na2(C10H7O4)8(H2O)8]. The compound is a 3D coordination polymer composed of centrosymmetric pentanuclear subunits. The antioxidant activity of these compounds was evaluated by assays based on different antioxidant mechanisms of action, i.e., with •OH, DPPH• and ABTS•+ radicals as well as CUPRAC (cupric ions reducing power) and lipid peroxidation inhibition assays. The pro-oxidant property of compounds was measured as the rate of oxidation of Trolox. The Mg(II) and Mn(II)/Na(I) complexes with isoferulic acid showed higher antioxidant activity than ligand alone in DPPH (IFA, IC50 = 365.27 μM, Mg(II) IFA IC50 = 153.50 μM, Mn(II)/Na(I) IFA IC50 = 149.00 μM) and CUPRAC assays (IFA 40.92 μM of Trolox, Mg(II) IFA 87.93 μM and Mn(II)/Na(I) IFA 105.85 μM of Trolox; for compounds’ concentration 10 μM). Mg(II) IFA is a better scavenger of •OH than IFA and Mn(II)/Na(I) IFA complex. There was no distinct difference in ABTS•+ and lipid peroxidation assays between isoferulic acid and its Mg(II) complex, while Mn(II)/Na(I) complex showed lower activity than these compounds. The tested complexes displayed only slight antiproliferative activity tested in HaCaT human immortalized keratinocyte cell line within the solubility range. The Mn(II)/Na(I) IFA (16 μM in medium) caused an 87% (±5%) decrease in cell viability, the Mg salt caused a comparable, i.e., 87% (±4%) viability decrease in a concentration of 45 μM, while IFA caused this level of cell activity attenuation (87% ± 5%) at the concentration of 1582 μM (significant at α = 0.05).

Paclitaxel and curcumin co-loaded mixed micelles: Improving in vitro efficacy and reducing toxicity against Abraxane®

Paclitaxel (PTX) is one of the most effective antineoplastic drugs employed for breast and ovarian cancer therapy. However, the neurotoxicity associated with PTX administration represents one of its main drawbacks reducing patient life quality. Recently, curcumin (CUR) has been explored as a neuroprotective agent due to its antioxidant properties. Then, the co-encapsulation of PTX and CUR in a mixed micellar formulation could promote a neuroprotective effect of the micellar system and optimize breast and ovarian cancer therapy. PTX-CUR-loaded Soluplus:TPGS mixed micelles were developed and characterized by nuclear magnetic resonance, scattering techniques and transmission electron microscopy. In vitro cytotoxicity was evaluated in MDA-MB-231 and SKOV-3 cancer cells. The in vitro antioxidant performance of CUR-loaded nanoformulations was confirmed employing lipid peroxidation inhibition and DPPH colorimetric assays. The neuroprotective effect of the micellar formulations was evaluated on zebrafish larvae. Mixed micelles demonstrated an excellent colloidal stability, before and after freeze-drying. Nanoformulations with both drugs demonstrated the best in vitro anticancer performance versus the commercially available nanoformulation Abraxane® in breast and ovarian cancer cells lines. The in vitro antioxidant properties of the mixed micelles with CUR were confirmed and their in vivo potential neuroprotective effect was assessed in the zebrafish model.

Effects of extraction solvent and time on the oil yield, total phenolic content, carotenoid and antioxidant activity of Australian chia seed (Salvia hispanica L.) oil

The oil yield, total phenolic content (TPC), total carotenoid content (TCC) and antioxidant activity of Australian chia seed (Salvia hispanica L.) oil under solvents polarity and extraction times were studied. The chia seed oils were obtained by using organic solvents in the Soxhlet method with different extraction times including acetone 4 hrs (A4), acetone 8 hrs (A8) and hexane 8 hrs (H8) as a control. The oil yield for the control sample (36.1%) showed significant (p ≤ 0.05) higher than A4 (33.53%) and A8 (33.73%). TPC for chia seed oil (A4) was significantly higher (p ≤ 0.05) than A8 and H8. Meanwhile, chia seed oil (A8) contained the highest TCC over A4 and H8. The antioxidant activity of chia seed oil was determined by DPPH (2-diphenyl-1-picrylhydrazyl) scavenging activity, FRAP (Ferric reducing antioxidant power assay), BCBA (Beta-carotene bleaching assay) and TBA (Lipid Peroxidation Inhibition Assay), respectively. Chia seed oil obtained by acetone extraction for 4 hrs revealed higher antioxidant capacities (DPPH, BCBA and TBA) compared to chia seed oils from A8 and H8. However, chia seed oil (H8) showed the lowest total (phenolic and carotenoid contents) and antioxidant capacities. The correlation between the antioxidant content and the antioxidant activities were conducted to determine their relationship. TPC and TCC were strongly correlated with BCBA (r = 0.999) and TBA (r = 0.997). The results found Australian chia seed oil extracted by acetone for 4 hrs (A4) had higher contents of phenolic and antioxidant activity than control (H8) due to high polarity of acetone to the antioxidant compounds. In conclusion, acetone can be applied as an alternative extraction solvent to increase the total phenolic and carotenoid contents as well as antioxidant activity of Australian chia seed oil.

Bioactive Peptides Originating from Gastrointestinal Endogenous Proteins in the Growing Pig: In Vivo Identification.

Recent in silico and in vitro studies have shown that gastrointestinal endogenous proteins (GEP) are a source of bioactive peptides. To date, however, the presence of such peptides in the lumen of the digestive tract has not been demonstrated. We investigated the generation of GEP-derived bioactive peptides in the growing pig fed a proteinfree diet. Stomach chyme (SC) and jejunal digesta (JD) fractions from 6 growing pigs (two sampling times) were assessed for their angiotensin-I-converting enzyme (ACE-I; EC 3.4.15.1) inhibition, and antioxidant activity using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) inhibition, ferric reducing antioxidant power (FRAP) and microsomal lipid peroxidation (MLP) inhibition assays. Two of the fractions prepared from JD samples inhibited ACE-I and DPPH by 81 (± 2.80)% and 94 (±0.66)%. SC fractions were found to inhibit MLP between 15-39 (±3.52-1.40)%. The study identified over 180 novel peptide sequences that were related to the determined bioactivities, including a porcine serum albuminderived peptide (FAKTCVADESAENCDKS), corresponding to f(7-23) of the human serum albumin peptide LVNEVTEFAKTCVADESAENCDKSLHTLF that was previously identified from the digests of the latter GEP. This study provides the first in vivo evidence for GEP as a source of bioactive peptides. These new findings help advance our knowledge of the latent bioactive role of GEP-derived peptides in mammalian nutrition and health and their potential pharmaceutical applications.

Screening of Antibacterial Activity, Antioxidant Activity, and Anticancer Activity of Euphorbia hirta Linn. Extracts

This study aimed to screen the anticancer and antioxidant potential and antimicrobial activity of methanol, petroleum ether, chloroform, ethyl acetate, butanol of Euphorbia hirta Linn. extracts (EH-Me, EH-PE, EH-Ch, EH-EA and EH-Bu, respectively). The results of 2,2-diphenyl-1-pycrylhydrazyl (DPPH) radical scavenging assay and lipid peroxidation inhibition assay showed that EH-EA was the strongest antioxidant (IC50 = 10.33 ± 0.01 µg/mL; IC50 = 1.48 ± 0.12 µg/mL, respectively) compared to all other extracts. In the antimicrobial activity of the extracts against eight strains of Gram-positive and Gram-negative bacteria using the agar disc diffusion method, we found the EH-EA to be the best antimicrobial agent. Anticancer activities of those extracts were examined by sulforhodamine B (SRB) in vitro cytotoxicity assay on two cancer cell lines, including lung cancer cells NCI-H460 and liver cancer cells Hep G2. EH-EA at concentration of 100 μg/mL has significant inhibitory activity the growth of lung cancer cells NCI-H460 and liver cancer cells Hep G2 compared to all other extracts. Our results suggest that E. hirta Linn. extracts possess significant biological activities, including antimicrobial, antioxidant, and moderate anticancer properties. Our results show that this plant could be a good source for natural antioxidants and a possible pharmaceutical supplement. Among five analyzed extracts, EH-EA extract has the strongest activities, and should be used to determine phytochemicals and mechanisms of these activities.

Chemistry and Antioxidant Potential of Phytoconstituents from Aegle Marmelos Fruit-Shell.

Oxidative stress is among the main causes of metabolic disorders. Hence, there is a need to discover potent antioxidants for therapeutic applications. The objective of this study has been to investigate the phytoconstituents of the methanolic extract of the hard shell of Aegle marmelos fruit and their antioxidant potential. Methanolic extract was fractionated using different solvents by liquid-liquid extraction. Characterization of the phytoconstituents was done by using phytochemical tests and GC-MS analysis. The free radical scavenging activity, total reducing power, lipid peroxidation inhibition and cell protection assays against oxidative stress were performed with methanolic extract and its fractions. Therapeutically significant class of compounds, for example, polyphenols, glycosides and sterols were revealed in the hard-shell extract. Differential separation of compounds was achieved by liquid-liquid extraction using different solvents. Six compounds: 4-Hydroxybenzeneacetic acid; 5-Oxo-pyrrolidine-2-carboxylic acid methyl ester; 1-[3-Methyl-3-Butenyl] Pyrrolidine; Trans-sinapyl alcohol; 5-[Hydroxymethyl]-2-furaldehyde and 2,4- Dihydroxy-2,5-dimethyl-3[2H]-furan-3-one, identified in the fruit-shell extract, are being reported for the first time from this plant. Strong antioxidant potential of the extract was evident from efficient scavenging of free radicals. The extract also conferred protection to yeast cells against oxidative damage. Results showed that the hard shell of the Aegle marmelos fruit was a potent source for antioxidant compounds, which can be developed for therapeutic applications in the control and management of metabolic diseases.

Antioxidant activity and inhibition of ultraviolet radiation-induced skin damage of Selenium-rich peptide fraction from selenium-rich yeast protein hydrolysate

The bioactive peptides and trace element selenium (Se) both have good antioxidant activity. However, whether combined Se and bioactive peptides have more excellent antioxidant activity remain unknown. The aim of this study is to prepare a Se-rich peptide fraction containing both Se and peptides from Se-rich yeast protein hydrolysate and investigated its antioxidant activity and effect on ultraviolet B (UVB) radiation-induced skin oxidative damage. The peptide fractions with different molecular weight (MW) and Se content were obtained by enzymatically hydrolyzing normal or Se-rich yeast proteins followed by a filtration process. In vitro free radical scavenging and lipid peroxidation inhibition assays showed that Se-rich peptides fraction with lower MW of <1 kDa (sSeP) had the highest antioxidant activity compared with Se-rich peptide fractions with higher MW of <3 kDa or normal peptide fractions. Oral administration of sSeP significantly decreased the level of malonaldehyde (MDA) in liver and serum, and increased the activity of glutathione peroxidase (GPx) in liver and serum in normal mice. When topically applied on the dorsal skin of mice, sSeP effectively alleviate UVB radiation-induced skin damage and oxidative stress by increasing GPx and catalase activities and glutathione content in skin or serum. Furthermore, sSeP showed a protective effect against H2O2-induced cytotoxicity in cultured human epidermal keratinocytes (HaCaT) cells probably by increasing aquaporin-3 expression and attenuating the phosphorylation of p38 MAPK. Overall, the results showed that Se-rich yeast peptide fraction containing Se and bioactive peptides could be a promising antioxidant nutrient used as food additive to enhance the body’s antioxidant ability or as cosmeceutical product to minimize the skin oxidative damage.

Antioxidant activity and chemical constituents of Anthriscus vulgaris Bernh. (Apiaceae) from Algeria

Abstract The chloroform and ethyl acetate extracts obtained from the aerial parts of Anthriscus vulgaris Bernh. were analyzed by gas chromatography-mass spectrometry (GC-MS). 36 components have been identified in each extract. The major constituents were 1-monooleoylglycerol (20.72%), caffeic acid (15.20%), cinnamic acid (11.31%) and benzene acetic acid (10.95%). The phytochemical study led to the isolation and structural elucidation of three compounds, scopoletin, umckalin and 1-(3’,4’-dihydroxycinnamoyl) cyclopentane-2,3-diol. Moreover the ethyl acetate extract was screened for its possible in vitro antioxidant activity by 2,2-diphenyl-1-picrylhydrazy l(DPPH) and lipid peroxidation inhibition assays in which it displayed a noticeable activity. This study provides the first biological and chemical investigation on Anthriscus vulgaris Bernh. in Algeria.

Immunostimulatory and antioxidant activities of a lignin isolated from Conocarpus erectus leaves

In this work, we investigated the antioxidant and immunomodulatory activities of a lignin isolated from Conocarpus erectus leaves. The lignin was characterized by FTIR, 1H NMR, 13C NMR and gel permeation chromatography analysis as well as ultraviolet/visible absorption spectra. The lignin was evaluated for total antioxidant activity (TAA), DPPH and ABTS+ scavenging abilities, and by a lipid peroxidation inhibition assay. Immunomodulatory activity of the lignin (10 μg/mL) on human peripheral blood mononuclear cells (PBMCs) was determined. The C. erectus lignin was found to be of the guaiacyl-syringyl-p-hydroxyphenyl (G-S-H) type, with an average molecular weight of 2709 Da (polydispersity index: 2.1). It showed low TAA (17.92%) and moderate antioxidant activity against DPPH and ABTS+ (IC50: 231.16 and 356.03 μg/mL, respectively). It also inhibited lipid peroxidation by 42.14%. The lignin promoted an increase in mitochondrial ROS levels as well as cytosolic Ca2+ in PBMCs. In addition, it promoted the differentiation and activation of CD8+ T lymphocytes, differentiation of CD14+ monocytes, and stimulated the release of nitric oxide and cytokines, mainly those linked to a Th1 response. The results showed that the C. erectus lignin may be used in future studies in which the modulation of the immune response is a key factor.

In-vitro antioxidant, antimutagenic and cancer cell growth inhibition activities of Rhododendron arboreum leaves and flowers.

In the current investigation, the active principles of the methanol extracts of Rhododendron arboreum leaves (MEL) and flowers (MEF) were investigated with the help of ultra-high performance liquid chromatography (UHPLC), amino acid analyzer and gas chromatography mass spectrometry (GC-MS). UHPLC revealed different polyphenols present in the extracts. GC-MS identified 20 phytochemicals in leaves and 17 in the flowers, whereas, amino acid analyzer confirmed 11 amino acids in leaves and 10 in the flowers. The extracts were subjected to the investigation of biological activity through analysis of antioxidant activity in different in vitro assays, antimutagenic activity in Ames assay and cancer cell growth inhibition activity by MTT (3-4,5 dimethylthiazol-2,5 diphenyltetrazolium bromide) assay. MEL showed higher antioxidant activity in lipid peroxidation inhibition assay (95.32 ± 0.37%) than MEF (77.09 ± 4.17%) with IC50103.6 µg/ml for MEL and 271.17 µg/ml for MEF. In nitric oxide scavenging assay, an activity of 94.46 ± 0.32% (IC50 150.13) was observed in MEF followed by 83.71 ± 0.74% (IC50 179.52) in MEL. The antimutagenic activity of both the extracts was evaluated against sodium azide, 4-nitro-O-phenylenediamine and 2-aminofluorene mutagens in TA-98 and TA-100 strains of Salmonella typhimurium. The analysis was carried out using pre- and co-incubation modes. However, both extracts were observed to possess considerable antimutagenic activity against different known mutagens, flowers came out to be more effective than the leaves in terms of % inhibition. The extracts also exhibited significant cancer cell growth inhibition activity, when tested against 3 cancer cell lines namely, Human cervical cancer cell line (HeLa), Breast cancer cell line (MCF7) and Lung cancer cell line (A549). In case of HeLa and A549, MEL showed higher activity of 64.62 ± 2.65 and 75.08 ± 1.68% as compared to 53.11 ± 2.84 and 45.92 ± 2.43% in MEL, respectively. The EC50 values for MEL in HeLa and A549 were noted to be 232.76 and 155.38 µg/ml, respectively, whereas, MEF had EC50 of 395.50 µg/ml in HeLa and 660.26 µg/ml in A549. Further, MEF showed higher cytotoxicity in MCF7 cell line (84.93 ± 1.17%) followed by the MEL (73.57 ± 1.27%) with EC50 value of 95.16 µg/ml for MEF followed by 172.19 µg/ml for MEL. The biological activities of the extracts can be attributed to the phyto-constituents identified by sophisticated instruments.The biological activities of the extracts can be attributed to the active principles identified by sophisticated instruments.

Evaluation of In vitro antioxidant potential of active metabolite constituents of different extracts of Chaetomium cupreum-SS02 by spectrophotometric method

Objective: The main objective of the study was to evaluate the antioxidant activities of Chaetomium cupreum extracts. Materials and Methods: The total flavonoid content was determined by using aluminum chloride method, whereas antioxidant activity (AA) was evaluated by ferric reducing antioxidant power assay, potassium ferricyanide reducing power assay, 2,2-diphenyl-1-picyl-hydrazyl method, β-carotene bleaching assay, cupric ion reducing antioxidant capacity assay, lipid peroxidation inhibition assay by thiobarbituric acid (TBA)-reactive substance method, and inhibition of hydrogen peroxide-induced erythrocyte hemolysis assay. Results: The ferric reducing AA of C. cupreum extracts at the concentration of 50 μg/mL was higher in ethyl acetate extract (6.11%) followed by chloroform extract (3.96%), n-butanol extract (2.44%), and methanol extract (2.02%) mg RE/g dry weight. The potassium ferricyanide reducing activity of C. cupreum extracts at the concentration of 50 μg/mL was higher in ethyl acetate extract (15.90%) followed by chloroform (9.50%), n-butanol (4.93%), and methanol extract (2.92%). The 2, 2-diphenyl-1-picryl-hydrazyl activity of C. cupreum extracts at 50 μg/mL was higher in ethyl acetate extract (36.13%) followed by n-butanol extract (24.17%), chloroform extract (15.04%), and methanol extract (4.71%). The β-carotene bleaching activity of C. cupreum extracts at 50 μg/mL after 1 h of incubation was higher in ethyl acetate extract at 12.88%, followed by chloroform extract (9.82%), n-butanol extract (5.63%), and methanol extract (3.76%). The cupric ion reducing AA (CUPRAC) of C. cupreum extracts at 50 μg/mL was highest in the methanol extract (18.62%) followed by ethyl acetate extract (9.72%), n-butanol extract (7.18%), and chloroform extract (2.46%) mg ACE/g dry weight. With regard to TBA reactive substance activity of C. cupreum extracts at 50 μg/mL, n-butanol extract showed the highest lipid peroxidation inhibition (55.39%) followed by chloroform extract (50.51%), ethyl acetate extract (46.27%), and methanol extract (43.60%). With regard to the hydrogen peroxide-induced hemolysis inhibition activity of C. cupreum extracts at the concentration of 500 μg/mL, ethyl acetate extract showed the highest inhibition (30.53%) followed by chloroform extract (26.42%) and n-butanol extract (9.16%). Conclusion: The results of the present study showed that C. cupreum extracts poses significant antioxidant potential.

Temperature dependent studies on nutritional, total polyphenols, flavonoids content and antioxidant activities of Aframomum citratum (C.Pereira) K.Schum and Tetrapleura tetraptera (Schum. &amp; Thonn.) Taub. fruits

Description. Hard shelled fruits, Tetrapleura tetraptera and Aframomum citratum nonwood forest products are used as spices and for many medicinal recipes. Mostly used together, they undergo heat treatment before being milled when cooking Mbongo Tchobi, a black spicy stew from central and coastal regions in Cameroon. Objectives. Evaluate the impact of roasting these spices on the physicochemical properties (dry matter, ash, raw protein, total sugar, raw fibre, pH, aw, total energy, total fat), phytochemical content (total polyphenol, total flavonoids) and the antioxidant activities (total antioxidant activity, FRAP, DPPH and lipid peroxidation inhibition assays) of their aqueous extracts in a home food consumption context. Method. Tetrapleura tetraptera and Aframomum citratum fruits from Ngola locality in Yokadouma (east region in Cameroon) locality were collected, sorted, cleaned and dried (72 h, 45 °C) in an oven. Cut into small pieces, a part was heated using roasting parameters deduced from preliminary tests (140 °C/10 min; 180 °C/20 min and 150 °C/12 min respectively for T. tetraptera, A. citratum and a formulation 95/5 of the two spices). The heated and unheated spices were ground and an infusion was prepared from boiling water in the proportion of 1/5 (g·ml-1) for both types of spices. Physicochemical and phytochemical characteristics (dry matter, total ash, fat, sugar, crude fibre and energy contents, pH, aw, total flavonoids and polyphenols) as well as the antioxidant activities of the aqueous extracts of the two spices and a mix of the two spices were evaluated before and after the heat treatment. Results. Heat treatment significantly (p &lt; 0.05) reduces fat and total sugars contents but improves raw fiber contents for all spices. Phenolic content is more important for heated spices and percentage differences before and after heat treatment are between 8.0 and 23.2% for both spices. Extracts obtained with heated spices possess the best antioxidant potential. Strong significant positive correlations have been established between the phenolic compounds and the reductive antioxidant activities and negative correlations with the antiradical antioxidant activities as they are expressed as IC50 (mg·ml-1). Conclusions. In most of the features studied, the heated formulation (95/5) possesses the highest characteristics studied. The choice of heating these spices under the roasting parameters identified should be guided by the desire of improving their antioxidant potential because of the nutritional losses observed after heat treatment.

Antioxidant, antimicrobial and phytotoxic activities of Rhaponticum acaule DC. essential oil

The in-vitro antioxidant activity of Rhaponticum acaule essential oil (RaEO) was evaluated using β-carotene/linoleic acid bleaching, chelating activity, and lipid peroxidation inhibition (TBARS) assays. The antimicrobial activity of RaEO was assessed by disc diffusion and microdilution methods against 8 bacteria and 4 yeast. Finally, the allelopathic activity of RaEO on the seed germination and the shoot and root elongation of lettuce (Lactuca sativa L.) seedlings were investigated. According to our results, the RaEO exhibited significant antioxidant activity, similar to those of standards (BHT and ascorbic acid) with IC50 values of 0.042 and 0.045 mg/mL obtained by β-carotene bleaching and TBARS assays, respectively. On the other hand, despite its interesting ferrous chelating activity, RaEO possesses moderate IC50 value (0.35 mg/mL) as compared with that of EDTA (0.015 mg/mL). RaEO exhibited a strong antimicrobial activity against all the tested microorganisms, with IZ, MIC and MBC values being in the range of 7.67 ± 0.58 to 13.33 ± 0.58 mm, 1.25 to 5.00 and 5.00 to 10.00 mg/mL, respectively. The results reveled also that RaEO inhibited the shoot and root growth of Lactuca sativa L. seedlings. Our data suggested that the RaEO had pharmaceutical benefits and could be used as a potential natural herbicide resource.

Purification, Characterization and Antioxidant Potential of a Novel Lectin from Pterocarpus soyauxii Taub Seeds

The study investigated the presence of lectin in the seeds of Pterocarpus soyauxii, purified the lectin and determined its physicochemical properties as well as its antioxidant potential. Purification of P. soyauxii seeds lectin (PSSL) was accomplished by ammonium sulphate precipitation and gel filtration on Sephadex G-100, hemagglutination assay was by serial dilution and DPPH radical scavenging, metal chelating and lipid peroxidation inhibition assays were employed to evaluate its antioxidant potential. PSSL agglutinated erythrocytes from human blood group ABO, rabbit and rat. Trypsinization enhanced agglutination which was inhibited by galactose, lactose and arabinose. The lectin activity was independent of metal ion, thermal stable up to 60 °C and at pH range of 6 to 8. Gel filtration estimated molecular weight was 65 kDa and subunit molecular weight was 35 kDa. PSSL showed significant antioxidant activity. The lectin was able to scavenge DPPH radical, chelate iron metal and inhibit lipid peroxidation with IC50 of 0.14 ± 1.33 mg/ml, 3.40 ± 0.37 mg/ml and 0.50 ± 0.08 mg/ml respectively. The results indicate that PSSL might be applied as natural antioxidant for the development of drug and food products for the benefit of human health.

IN VITRO EVALUATION OF ANTIOXIDANT-MEDIATED APOPTOSIS ON CANCER CELLS AND NON-TOXICITY OF ETHANOLIC EXTRACT OF TERMINALIA CHEBULA RETZ AND PYROGALLOL

Objective: Antioxidants are very important for human health, and hence, external supplementation is recommended to protect cells from the deleterious effects of excessive reactive oxygen species conditions that are capable of causing direct damage to deoxyribonuclieic acid (DNA) which might lead to the cause of cancer. In our research work, we have aimed to evaluate the antioxidant potential of Terminalia chebula and pyrogallol to relate to its apoptotic nature as well as prove its non-toxicity.Methods: Investigations were carried out to determine the antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl and lipid peroxidation inhibition assay of the ethanolic extract of T. chebula and pyrogallol. The apoptotic nature of tumor cells was determined by comet assay. To prove the non-toxicity of the extract as well as compound, the hemolysis assay was carried out.Results: The results of our study established the antioxidant potential of the plant which may serve as additional evidence for the antiproliferative activity of the plant. It is considered safe for human use.Conclusion: Plant-based traditional medicine system continues to play an essential role in health care. The ethanolic extract of T. chebula and pyrogallol possesses antioxidant and anticancer properties.

IN VITRO EVALUATION OF ANTIOXIDANT-MEDIATED APOPTOSIS ON CANCER CELLS AND NON-TOXICITY OF ETHANOLIC EXTRACT OF TERMINALIA CHEBULA RETZ AND PYROGALLOL

Objective: Antioxidants are very important for human health, and hence, external supplementation is recommended to protect cells from the deleterious effects of excessive reactive oxygen species conditions that are capable of causing direct damage to deoxyribonuclieic acid (DNA) which might lead to the cause of cancer. In our research work, we have aimed to evaluate the antioxidant potential of Terminalia chebula and pyrogallol to relate to its apoptotic nature as well as prove its non-toxicity.Methods: Investigations were carried out to determine the antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl and lipid peroxidation inhibition assay of the ethanolic extract of T. chebula and pyrogallol. The apoptotic nature of tumor cells was determined by comet assay. To prove the non-toxicity of the extract as well as compound, the hemolysis assay was carried out.Results: The results of our study established the antioxidant potential of the plant which may serve as additional evidence for the antiproliferative activity of the plant. It is considered safe for human use.Conclusion: Plant-based traditional medicine system continues to play an essential role in health care. The ethanolic extract of T. chebula and pyrogallol possesses antioxidant and anticancer properties.