Comparative Analysis Of Antioxidant Activity Research Articles

Comparative analysis of antioxidant activities and chemical compositions in the extracts of different edible parts from Camellia tetracocca Zhang (C. tetracocca) with two distinct color characteristics

The Camellia tetracocca Zhang is a rare and ancient plant, exclusively found in the vicinity of Puan County, Guizhou Province, China. According to leaf color, two distinct variations have been identified: purple C. tetracocca Zhang (PCTZ) and green C. tetracocca (GCTZ). This research was conducted to investigate the antioxidant activities and chemical compositions of different edible parts of PCTZ and GCTZ. Antioxidant activity was evaluated using DPPH, ABTS, HSA, and T-AOC assays, while the content of compounds was determined by HPLC. The findings demonstrated that the antioxidant capacity of PCTZ leaves is significantly superior to that of GCTZ leaves. Notably, theacrine, a rare compound, contains up to 2.075% in PCTZ leaves, indicating potential as a novel natural antidepressant and antioxidant. In conclusion, PCTZ is a distinctive tea beverage and a valuable genetic material for tea tree breeding due to its high theacrine and low caffeine characteristics.

Comparative analysis of antioxidant activity and capacity in apple varieties: Insights from stopped flow DPPH• kinetics, mass spectrometry and electrochemistry

The aim of this research was to investigate the antioxidant kinetics of different apple varieties, a red-flesh variety (‘R201’), a non-browning (‘Majda’), and a ‘Golden Delicious’. Kinetic approaches for antioxidant activity provide more detailed information than conventional assays by examining both the quantity and velocity of active molecules in their reaction with radicals. In this study, DPPH• stopped flow method was applied to study the antioxidant activity and capacity of the three apples varieties, allowing the determination of the reaction rates. The results show that the antioxidant activity of ‘R201’ was not significantly different from ‘Golden Delicious’. Instead, the activity of the non-browning variety was 20 times higher than the others according to the DPPH• kinetic approach, despite having the lowest phenolic content. To further understand their reactivity, the antioxidant molecules were identified using HPLC-HRMS/MS coupled with a coulometric array detector, which validated the DPPH• kinetics. This analysis also found differences in the phenolic profile of the three varieties, attributed to the enhanced antioxidant activity of 'Majda' to its high content of ascorbic acid. Overall, the research highlights that the antioxidant behavior of apples primarily depends on the velocity of the antioxidants rather than the amount of phenolic compounds.

Comparative analysis of antioxidant activities of Vitex negundo and Ficus carica leaf extracts

Humans have been dependent on nature for various vital supplies and resources for a long time. Most biotechnological and pharmacological industries use chemicals and active compounds to treat diseases or make medications isolated from natural resources. A variety of plants have been explored for research of which Vitex negundo and Ficus carica are also examples as they are strong candidates for their potential antioxidant properties. In the current research, the anti-oxidant activities of V. negundo and F. carica leaf extracts were evaluated. The antioxidant activities of selected plants were analyzed using DPPH and FRAP assay. The results obtained from the DPPH assay indicated that methanolic extracts of V. negundo showed the highest inhibition of 90.07±1.17 percent at 1000 µl with IC50 value of 415.98 µg/ml followed by ethyl acetate and chloroform extracts (64.05±0.89 and 54.39±0.99 percent, respectively) with IC50 value of 751.96 µg/ml and 896.55 µg/ml when compared to F. carica extracts which showed highest inhibition of 75.75±1.08 percent at 1000 µl with IC50 value of 475 µg/ml followed by ethyl acetate and chloroform extracts (51.94±0.79 and 44.21±0.60 percent respectively) with IC50 value of 967.51 µg/ml and 1092.48 µg/ml. On comparing both plants, FRAP results indicated that methanol extracts of V. negundo showed the highest FRAP value (1042.1±0.98 µM) followed by ethyl acetate and chloroform extracts, which shows 996.6±1.25 µM and 949.6±1.63 µM at 1000 µl whereas F. carica showed highest FRAP value (995.6±1.35µM) followed by ethyl acetate and chloroform extracts, which shows 987.6±1.05µM and 447.6±1.01µM at 1000 µl. The results of the study can be concluded that among the tested extracts, the best antioxidant potential was exhibited with V. negundo leaf extracts, especially in methanol extracts.

Phytochemical extraction and comparative analysis of antioxidant activities of Areca catechu L. nut extracts

FRAP assay proved all the extracts of Areca catechu L. nut have antioxidant properties because IC50 values of all the extracts of the same were less than that of ascorbic acid. Remaining antioxidant assays like DPPH radical scavenging assay, H2O2 scavenging assay, and Fe2+ chelating assay showed more antioxidant properties in ethyl acetate extract and nonpolar solvent extracts like n- hexane, and chloroform respectively. Antioxidant properties of Areca catechu L. nut varied depending upon the different solvent extract.

Comparative analysis of antioxidant activities between dried and fresh walnut kernels by metabolomic approaches

Fresh walnut kernel (FW) and dry walnut kernel (DW) are significantly different in antioxidant activity. However, the metabolomic mechanism underlying these differences remains to be explored. Here, we evaluated the antioxidant activities of FW and DW of four walnut varieties, and characterized their metabolites by GC-MS and LC-MS/MS. The influence of different metabolites on antioxidant activity of walnut kernel was investigated through a multivariate analysis. DW showed significantly higher antioxidant activities than FW. A total of 144 metabolites were detected in all samples. Pearson correlation analysis demonstrated that phenolic metabolites and polyunsaturated fatty acids significantly affect the antioxidant activity. A further network analysis of 21 target differential metabolites indicated that the higher antioxidant activity of DW may be mainly attributed to the higher content of phenolic acid polymers. This study reveals the potential mechanism for improving of antioxidant activity of walnut kernels by drying.

Comparative analysis of antioxidant activity, toxicity, and mineral composition of kernel and pomace of apricot (Prunus armeniaca L.) grown in Balochistan, Pakistan.

The present study aims to investigate some physical attributes, total phenolics content, total flavonoids content, mineral composition, bioluminescence toxicity assay and antioxidant activity in terms of DPPH, HPS, TAC and FRAP assays in the kernel and pomace samples of six apricot cultivars grown in Balochistan, Pakistan. TFC and TPC determined by the AlCl3 and Folin-Ciocalteu assays in apricot kernel extracts of six cultivars varied from 1797.5 (Chagali) to 4778.9 (Badoghur) mg QUE/100 g DW and from 1750.0 (Chagali) to 5005.8 (Badoghur) mg GAE/100 g DW. Apricot kernels exhibited higher antioxidant activity than pomace; antioxidant activity in terms of IC50 in kernels ranged from 24.88 to 98.61 μg/ml for DPPH, 334.84 to 516.63 μg/ml for HPS, from 22.02 to 110.80 μg/ml for TAC and from 96.27 to 163.35 μg/ml for FRAP. The apricot kernels showed higher TPC, TFC, bioluminescence toxicity to V. logei and antioxidant activity than the pomace. The correlation analysis demonstrated substantial contributions of polyphenols and flavonoids to antioxidant assays. The sample type was the leading factor affecting the amounts of K, Na, Ca, Fe, and Mn in the tested samples; mineral contents were higher in pomace than kernels. The highest inhibition to V. logei was found in the kernels of Badoghur (IC50 = 1.61 mg/ml). The PCA analysis showed significant contributions of phenolic and flavonoid contents towards antioxidant bioluminescence toxicity assays. Our results suggest Badoghur, Shakarpara and Sardai kernels are rich sources of secondary metabolites and possess remarkable antioxidant and antiluminescence activity and can make a significant contribution to the treatment and prevention of chronic health problems.

Comparative analysis of antioxidant activity and phenolic compounds in the fruits of Aronia spp.

Chokeberry (Aronia Medik.) is a non-traditional fruit plant known as a rich source of biologically active compounds and inhibits the numerous biological activities. We compared the antioxidant activity and phenolic compounds of fruits between widely cultivated Aronia mitschurinii (AM-TCH, from Tchekhov district; AM-D, from Dmitrov district; AM-OZ, from Orekhovo-Zuevsky district of Moscow region, Russia) and introduced North American Aronia species (Aronia arbutifolia (AA-M), A. melanocarpa (AML-M), A. × prunifolia (AP-M), which have not been planted yet in the arboretum of Main Botanical Garden of the Russian Academy of Sciences (Moscow). Studying samples were collected in their secondary distribution range. Ethanolic extracts were determined for antioxidant capacity (antioxidant activity by DPPH and phosphomolybdenum methods, the total content of polyphenols, flavonoids, phenolic acids) and measured spectrophotometrically. As standards were used Trolox (TE) for antioxidant activities, gallic acid (GAE) for polyphenol content, quercetin (QE) for flavonoid content, caffeic acid (CAE) for phenolic acid content. The antioxidant activity by DPPH method in ethanol extracts of investigated plants was from 6.96 (AM-D) to 8.89 (AM-OZ) mg TE.g-1 DW. Reducing the power of investigated extracts exhibited activity from 151.47 (AM-OZ) to 297.8 (AA-M) mg TE.g-1 DW. The content of polyphenol compounds determined from 25.98 (AM-TCH) to 54.39 (AA-M) mg GAE.g-1 DW, phenolic acids content was from 7.76 (AP-M) to 11.87 (AM-D) mg CAE.g-1 DW and the content of flavonoids detected from 8.12 (AM-OZ) to 16.62 (AM-D) mg QE.-1 DW. Obtained data showed a strong correlation between the content of polyphenol compounds and reducing the power of extracts (r = 0.700), between flavonoids and phenolic acids (r = 0.771) and also between phenolic acids and reducing power (r = 0.753) in Aronia ethanol extracts. Fruits of investigated species of Aronia can be propagated as a source of polyphenol compounds with antioxidant activity and obtained results may use for farther pharmacological study.

Comparative analysis of antioxidant activities of essential oils and extracts of fennel (Foeniculum vulgare Mill.) seeds from Egypt and China

The present study was conducted to assay the antioxidant activities of essential oils and ethanol extracts of fennel (Foeniculum vulgare Mill.) seeds from Egypt and China. The major components of the Egyptian fennel essential oil were estragole (51.04%), limonene (11.45%), l-fenchone (8.19%) and trans-anethole (3.62%) by GC–MS analysis. Whereas, the major constituents of Chinese fennel essential oil were trans-anethole (54.26%), estragole (20.25%), l-fenchone (7.36%) and limonene (2.41%). The fennel seed extracts from Egypt and China contained appreciable levels of total phenolic contents (42.24 and 30.94 mg PE/g, respectively). The extracts exhibited good DPPH radical scavenging capacity with IC50 (6.34 and 7.17 mg/g), respectively. A high variation in free radical scavenging activities of essential oils was observed. The Chinese fennel essential oil showed high activity in DPPH radical scavenging with IC50 (15.66 mg/g). The Egyptian fennel essential oil showed very low activity with IC50 (141.82 mg/g). The results of the present investigation demonstrated significant variations in the antioxidant activities of fennel essential oils and extracts from Egypt and China.

Potential use of secondary products of the agri-food industry for topical formulations and comparative analysis of antioxidant activity of grape leaf polyphenols

The aim of the present study was to develop a phytocosmetic using Vitis waste by-products, for use as a topical formulation for skin protection against ultraviolet radiation damage. The study also evaluates the free radical scavenger activity of the crude extracts of dried leaves of Vitis vinifera and Vitis labrusca, as well as the anthocyanins, flavonoid fraction and isolated compounds. Next, release and permeation studies of hydrogels were performed using Franz-type diffusion cells. Flavonoid acted more intensively in TRAP and conjugated dienes antioxidant assays, whereas anthocyanins had higher antioxidant activity in hydroxyl and nitric oxide assay. Only quercetin-3-O-glucuronide (5) was released from hydrogels, and the flavonoid retention in porcine ear skin after eight hours of permeation was below of limit of quantification for this compound. The polyphenols present in Vitis are capable of absorbing UV and visible light, justifying their potential as sunscreens for the development of a phytocosmetic.

Comparative analysis of antioxidant activities and phytochemical properties of some culinary herbs

The present work aimed to evaluate the antioxidant activities as well as phytochemical analysis of leaf extracts of some commonly used leafy spices such as Murraya koenigi (Mk), Coriandrum sativum (Cs), Trigonella foenum-graecum (Tfg) and Mentha x piperita (Mp). Lyophilised plant extracts (LPEs) were obtained by hot water extraction (HWE) process followed by rotavap and lyophilisation. Among the herbs tested, Mk showed the highest antioxidant activity in DPPH Scavenging (77.35 % mg-1 of LPE), superoxide anion radical scavenging (60.21 % mg-1 of LPE) and hydrogen peroxide scavenging (57.21 % mg-1 of LPE) model. Tfg showed least activity in DPPH scavenging (33.15 % mg-1 of LPE) and superoxide anion radical scavenging (25.36 % mg-1 of LPE) assay while Cs had the least activity in hydrogen peroxide scavenging (43.70 % mg-1 of LPE) system. Phytochemical investigations revealed the presence of major primary and secondary metabolites. MK possessed highest amount of phenolics (5.70 mg GAE g-1 of LPE), soluble sugars (68.18 mg GLE g-1 of FTW) and proteins (69.84 mg BSAE g-1 of FTW) and plant pigments (total chlorophyll 6.22 mg g-1 of FTW and total carotenoid 0.19 μg g-1 of FTW) among the herbs. SDS-PAGE and HPLC finger printing had been performed for analysis of protein patterns and phenolic compounds respectively. In conclusion, addition of culinary herbs and leafy spices that show high to moderate antioxidant activity with an excellent amount of phytochemicals in dietary items would go a long way in assuring human health and wellness as well as enhancement of the disease fighting capacity against oxidative stress related disorders.

Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays

Hydrogen peroxide scavenging (HPS) activity of honey of different floral sources and its constituents such as predominant honey flavonoids, phenolic acids, amino and organic acids, and carbohydrates have been assessed by direct current (DC) polarographic assay. The assay was based on decrease of anodic current of hydrogen peroxide complex, formed in alkaline solution, at the potential of mercury dissolution. High correlations between honey HPS activity, its total phenolic content (FC-GAE), antioxidant activity measured by four standard methods (DPPH, TEAC, FRAP and ORAC), and also the relative antioxidant capacity index, were obtained. Statistical evaluation by ANOVA and F-test further confirmed the assay validity. The results for individual compounds showed that HPS activity of honey reflects an integrated action of a wide range of constituents, both phenolics and non-phenolics. The polarographic assay applied is a fast, reliable and low cost alternative to spectrophotometric antioxidant assays commonly applied in analysis of honey and can serve as an indicator of honey quality.

Comparative analysis of antioxidant activity in leaves of different hosts infected by mistletoe (Viscum album L. subsp. album)

Studies were performed at different sites in the major city of Lodz (Poland), where mistletoe is particularly abundant. The occurrence of total antioxidant enzyme activities such as superoxide dismutase (SOD), guaiacol peroxidase (POD) and the protein and phenol contents in leaves from different hosts infected by European mistletoe (Viscum album L. subsp. album) were studied. Some elements may vary in samples from the same mistletoe species on different host trees and species. The most important are changes in the concentration of proteins, including enzyme and stress proteins, in the leaves of trees infected by mistletoe, may indirectly indicate an interaction between host and parasite. There were no important differences in the soluble phenolic content after infection. The change in POD after infection was not significant in comparison to control plants. The SOD activity was significantly higher in leaves from infected trees in comparison to control plants. The obtained data suggest that the increase in SOD and protein content depends mainly on the host taxa. Moreover, we suggest that the main increase in SOD activities in leaves is a consequence of the stress oxidation that caused infection and development of the parasite on the host plant. Chemical analyses of mistletoe from a large sample of host species provide evidence that this parasite may be extremely tolerant to air pollution.