Hydrogen-donating Ability Research Articles

Effect of Solvent Pretreatment on the Flash Pyrolysis Performance of Yinggema Lignite

Yinggema lignite (YL) was pretreated with isometric acetone/carbon disulfide mixed solvent to obtain the residue (RYL) and, then, RYL was separated by density difference with carbon tetrachloride to obtain the light residue (LRYL). The flash pyrolysis performances of YL and LRYL were analyzed by thermogravimetry–Fourier transform infrared spectrometer–Gas chromatography/mass spectrometer (TG-FTIR-GC/MS). The results showed that solvent pretreatment could remove some small molecules in the coal and swell the used coal, leading to the increase in pyrolysis reactivity. The intensity and absorption peak area of C=O from LRYL were significantly reduced compared to YL, resulting from the high hydrogen-donating ability of acetone. The main gaseous products of both samples are H2O, CH4, CO2, and CO; the hydrocarbons detected by GC/MS in the pyrolysis products of YL and LRYL at 450 °C were mainly alkanes, alkenes, and arenes, with the higher relative contents of alkanes of 31.1% and 36.2%, followed by arenes of 27.1% and 22.6%, respectively. The oxygen-containing compounds were mainly alcohols and phenols. It is speculated that the pretreated coal could expose more oxygen-containing functional groups, facilitating their conversion to phenolic hydroxyl groups during the pyrolysis process, resulting in more phenolic compounds.

Catalytic transfer hydrogenolysis mechanism of benzyl phenyl ether over NiCu/Al2O3 using isopropanol as hydrogen source

Efficient transfer hydrogenolysis of benzyl phenyl ether (BPE) was accomplished over Ni1.5Cu1.5/Al2O3 using isopropanol as hydrogen source. The characterization results demonstrated that the formation of NiCu alloy and electron transfer between Ni and Cu were responsible for the excellent catalytic performance. Isopropanol displayed better hydrogen-donating ability than other low-carbon alcohols because of its unique dehydrogenation pathway and small steric hindrance. The results of isotopic experiments elucidated that active hydrogen species for the CO bond cleavage originated from isopropanol rather than H2, while both isopropanol and H2 were responsible for hydrogenation of phenol to cyclohexanol when reaction was conducted with mixed hydrogen sources. A mechanism study illustrated that transfer hydrogenolysis of BPE proceeded through direct cleavage of CO bond followed by phenol hydrogenation, in which the active hydrogen species were in the form of H+ and H−.

Comparison of two-stage and single-stage liquefaction schemes for their effect on conversion and liquid yield of two low rank coals

Balancing the rates of coal radical fragments’ generation and hydrogen donation is crucial to inhibit the radical fragments’ condensation for a high oil yield and low hydrogen consumption in direct coal liquefaction (DCL). Two-stage liquefaction (TSL) has been proposed to be effective for balancing these rates under mild conditions but little work can be found in the literature on the comparison of TSL with single-stage liquefaction (SSL). This work studies direct liquefaction of two low-rank coals (NMH and SW) of very different volatile content under various TSL and SSL schemes in systems with different hydrogen donation ability. The coal conversion and products yield in different liquefaction schemes are correlated with their organic structure characterized by 13C NMR and predicted by a structure model. It is found that for the total 40 min liquefaction, the TSL scheme with 10 min at 420 ℃ followed by 30 min at 455 ℃ results in the highest liquid yield and lowest hydrogen consumption per liquid yield when the coal is very active but the hydrogen donation ability is insufficient. Otherwise, SSL at 455 ℃ is preferred. The coal conversion, liquid yield and hydrogen consumption per liquid yield of NMH under above TSL scheme at coal:THN= 1:2 are 85.5 wt%, 55.9% and 48.4 mmol-H/g-Liquid, respectively.

Hydrogen-Donor-Controlled Polybrominated Dibenzofuran (PBDF) Formation from Polybrominated Diphenyl Ether (PBDE) Photolysis in Solutions: Competition Mechanisms of Radical-Based Cyclization and Hydrogen Abstraction Reactions.

Polybrominated dibenzofurans (PBDFs) are characteristic dioxin-like products of polybrominated diphenyl ether (PBDE) photolysis. In this study, competition mechanisms of radical-based cyclization and hydrogen abstraction reactions are proposed in PBDF formation. Commonly, the ortho C-Br bond dissociation during photolysis generates aryl radicals, which undergo intramolecular cyclization to form PBDFs or hydrogen abstraction with hydrogen donors (such as organic solvents and water) to form lower brominated PBDEs. By using 2,4,4'-tribromodiphenyl ether (BDE-28) as the model reactant, the experimental PBDF formation ratios in various solutions are explained quantitatively by the calculated rate constants of cyclization and hydrogen abstraction reactions using the density functional theory (DFT) method. The solvent effect of pure and mixed solvents on PBDF formation is illustrated successfully. The structure-related hydrogen donation ability for hydrogen abstraction controls the bias of competition reactions and influences PBDF formation. Water resulted to be the most significant generation of PBDFs. Fulvic and humic acid display higher hydrogen donation ability than small-molecule organics due to the partitioning effect in aqueous solution. Quantitative structure-activity relationship (QSAR) models of the calculated rate constants for 512 cyclization and 319 hydrogen abstraction reactions using 189 PBDEs as the initial reactants in water are established, revealing the high risk of PBDF formation in aqueous solution.

Insights into Lewis/Brønsted acidity of metal chlorides and solvent effect of alcohols for synthesis of γ-valerolactone by combining molecular dynamics simulations and experiments

The synthesis of biofuel γ-valerolactone (GVL) from furfural is a multistep process that entails the regulation of Lewis/Brønsted (L/B) acidity of catalyst and the hydrogen donation ability of alcohols. In this study, experiments and molecular dynamics (MD) simulations were combined to get insights into the role of catalysts and solvents during the conversion of furfural to GVL. The capacities of various metal chlorides (divalent to hexavalent metal elements) and alcohols (primary and secondary alcohols) were comparatively investigated. The results showed that chlorides of Group IVB metals (ZrCl4 and HfCl4) exhibited excellent catalytic performance and achieved GVL yields of 61.88 % and 68.13 %, respectively. By preliminary statistical assessment, the intervals in which high isopropyl levulinate (IPL) yields and high GVL yields were found corresponded to different L/B acidity (3.5 < N < 4.8, −2 < Z < 1 and N < 5.7, Z > 1.5) (Z: Lewis acid strength. N: number of molecules in the shell). Secondary alcohols displayed the lower reduction potential but the higher interaction energy with reactants than that of primary alcohols. The distribution of Hf4+ around the reactants was tendentious, whereas the distribution of C3H7OH2+ was more homogeneous. The investigation of reaction mechanism proposed new understandings of the reacted sites of reactants and the hydrogen transfer of solvent to reactants. The hypothesis that IPL was capable of hydrogen/deuterium (H/D) exchange was developed.

Mesophase pitch production from fluorine-pretreated FCC decant oil

• Effect of fluorine treatment over FCC-DO for mesophase formation firstly suggested. • Reaction mechanism of mesophase formation by fluorination was suggested. • Fluorine promoted radical polymerization of FCC-DO to form heavy mesophase nuclei. • The amount of hydrogen donating species also increased after the fluorination. • Pitch from fluorinated DO had higher mesophase yield than pitch from pristine DO. Petroleum residue oil-based mesophase pitch production suffers from its low yield of mesophase. There have been continuous efforts, such as catalyst-assisted reactions and multistep heat treatments, to produce high-purity mesophase pitch. However, most of these techniques have difficulties with the processability. In this study, we suggest a novel fluorine pretreatment of fluid catalytic cracking (FCC) decant oil for mesophase pitch (MP) production. The effects of fluorine pretreatment on FCC decant oil were evaluated with mass spectrometry (MS) and their hydrogen donating ability. Subsequently, the MPs from pristine pitches with fluorine pretreatment were intensively compared in terms of structural, thermal, and chemical characteristics. From these results, it was found that fluorine pretreatment helps mesophase formation by catalytic radical polymerization but does not cause coking and does not require posttreatment. It was found that the fluorination method can also provide an effective method for generating MP by increasing the hydrogen donating ability (HDA) fraction. We believe that the results of this work could inspire new insights into MP production.

Quantitative Evaluation of the Hydrogen‐Donating Abilities ofAmines and Amides in Acetonitrile

AbstractIn this article, the thermo‐kinetic parameter ΔG≠°(XH) was used to evaluate the H‐donating ability of amine and amide. The second‐order rate constants of 41 HAT reactions from amines and amides to CumO⋅ in acetonitrile at 298 K were researched. The thermo‐kinetic parameters of 28 amines and 13 amides XH were obtained by the kinetic equation as ΔG≠°(CumO⋅)=−41.63 kcal/mol was available in previous work. The scales of the H‐donating abilities of these 28 amines and 13 amides were determined by using the thermo‐kinetic parameters ΔG≠°(XH). The H‐donating abilities of amines are stronger than amides, except for two amines without α‐C−H. The influencing factors of hydrogen donation abilities and the explanation for the HAT reaction sites for amides and amines are discussed from the direction of thermodynamics and kinetics in detail.. The hydrogen donation ability is determined by the combination of thermodynamic bond dissociation free energy ΔGo(XH) and kinetic intrinsic resistance energy ΔG≠XH/X, that is the thermo‐kinetic parameter ΔG≠°(XH). The H‐donating abilities of these amines and amides were compared with four bioactive antioxidants, NADH coenzyme analogue BNAH, F420H and Vitamin C and E. The results showed that these amines and amides are all weak H‐donors.

Evaluation of hydrogen donation ability of real hydrogen storage solvents by radical precursors

Hydrogen storage solvents (HSs) have drawn worldwide attention for viable transportation and utilization of hydrogen. The industrial HSs are mostly mixtures of countless compounds and have been used directly in hydrogenation reactions for decades, such as in the direct coal liquefaction. A good HS is of high hydrogen donation capacity, QH, and a low initial hydrogen donation temperature, Ti. These parameters have been quantified for some model HSs but not for real HSs. This work evaluates QH and Ti of 4 real HSs with two radical precursors and a first order kinetics, and correlates these parameters with molecular structures of the HSs. It is found that the maximum QH of real HSs is in the range of 20.8–36.3 mmol/g, which are higher than some model HS, such as dihydrophenanthrene (DHP) and dihydroanthracene (DHA), and one of them is even higher than that of tetralin (THN). The Ti of real HSs is in the range of 224.8–263.3 °C, which are similar to or slightly higher than those of DHP and DHA. The order of these parameters is found to be consistent with some of the HSs’ structure parameters, such as those characterized by GC × GC − MS, 13C NMR and 1H NMR.

Evaluation of Hydrogen Donation Ability of Industrial Hydrogen Storage Solvents by Radical Precursors

Evaluation of Hydrogen Donation Ability of Industrial Hydrogen Storage Solvents by Radical Precursors

Mild hydrogenation pretreatment of FCC slurry oil for high-value-added utilization: Exploitable high-boiling components and carbonization discrepancy

In response to the enormous market demand for high-value-added carbonaceous materials and the urgent requirement of energy conservation and emission reduction, FCC slurry oil (SO) has drawn widespread attention in the preparation of these kinds of carbonaceous materials due to its abundant aromatic hydrocarbon contents. Distillation can be utilized as a pretreatment to efficiently remove the quinoline insoluble and other undesirable components in SO before carbonization. However, the distillate depth and yield are greatly restricted by the conspicuous coking phenomenon during thermal effect in the distillation. Mild hydrogenation coupled with distillation were adopted as the pretreatments before carbonization and effects of the hydrogenation on the distillation process were studied. Besides, transform patterns for the properties of sub-fractions in specimen before and after hydrogenation and resulted variations in carbonization performances were then systematically analyzed. Through hydrogenation, the distillation depth of hydrotreated SO (HSO) could be greatly improved to 530 °C with no significant coking phenomenon and the distillation yield was increased dramatically (from 38.4 wt% to 68.1 wt%). Especially, partial super high-boiling (above 530 °C) components in SO could be transformed into naphthenoaromatic structures by hydrogenation and acquired through distillation for further utilizations. Using anthracene as chemical probe, the hydrogen-donating abilities (HDAs) of specimens were detected, and results indicated the amounts of transferable hydrogen in HSO low-boiling and high-boiling sub-fractions were greatly increased compared with that of SO, which would provide the specimen with stronger stability in the thermal treatment and restrain the rapid coking. The carbonization performance varied with the properties of sub-fractions and a section of high-boiling components in SO was discovered to be exploitable through hydrogenation and demonstrated to be beneficial in the preparation of needle coke.

A method to evaluate hydrogen donation ability of hydrogen-storage solvent in hydrogenation process by radical-precursor compounds

Hydrogen storage using organic solvent has attracted worldwide attention. Such solvents, generally named hydrogen storage solvent (HS), are expected to release H2 but can also be used directly in hydrogenation reactions. Hydrogen donation capacity (QHS-H) and initial hydrogen donation temperature (Ti) of HSs are important parameters in hydrogenation reaction. This work develops a simple method to determine these two parameters using radical-precursors (RP) containing weak covalent bonds. The test is carried out in an ambient-pressure glass microreactor system. The idea is estimating QHS-H by the amount of hydrogen obtained by RPs (QRP+H) and determining Ti by the first-order kinetics of RP hydrogenation reaction. Reliability of the method is verified by evaluating QHS-H of the structure–known HSs, 9,10-dihydrophenanthrene (DHP), 9,10-dihydroanthracene (DHA) and tetralin (THN) with benzyl phenyl ether (BPE) and bibenzyl (BBZ) as the RPs. Results show that QRP+H is close to QHS-H, and the p-value of F-test is higher than 0.05 at a confidence level of 95%. The Ti can be determined by the first-order kinetics of BPE hydrogenation.

Scavenging activity and reaction mechanism of Ti3C2Tx MXene as a novel free radical scavenger

A novel free radical scavenger, multi-layered Ti3C2Tx MXene (ML-Ti3C2Tx), has been studied by evaluating its scavenging activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH•). It exhibits high scavenging efficiency (95% in 10 min) at low dosage (0.06 mg/mL). Based on the analysis of structure and surface states of ML-Ti3C2Tx before and after reaction with DPPH• and a series of comparative experiments, including few-layered Ti3C2Tx MXene (FL-Ti3C2Tx), original Ti3AlC2, and soluble Ti species derived from ML-Ti3C2Tx, the observed high scavenging activity is attributed to the intrinsic reducing property of ML-Ti3C2Tx rather than the hydrogen donation ability from surface functional groups. A model is proposed to explain the scavenging mechanism.

Photoconversion of polychlorinated naphthalenes in organic solvents under simulated sunlight: Solvent effect and mechanism

In this work, the organic solvent effect on the photoconversion of polychlorinated naphthalenes (PCNs) under the simulated sunlight, as well as the mechanism and influence factor were studied. Eight organic solvents were selected to demonstrate the solvent effect on the photoconversion by the theoretical calculation method. It was found that the photoconversion rates of 1-chloronaphthalene (CN-1) in different organic solvents were in the order of dimethyl sulfoxide > methanol > acetonitrile > ethanol > dichloromethane > toluene > n-hexane > acetone. The result, obtained by the density functional theory (DFT) computation and the polarized continuum model (PCM) analysis in the framework of self-consistent reaction field (SCRF), indicated that the photoconversion was affected by the hydrogen-donating ability and electron-withdrawing potential of the solvents, as well as non-specific solute-solvent interactions. The photoconversion in acetonitrile for the five PCNs (1-chloronaphthalene, 2-chloronaphthalene, 2,3-dichloronaphthalene, 1,2,3,4-tetrachloronaphthalene, and 1,2,3,4,5,6,7,8- octachloronaphthalene) all fitted well with the first-order kinetic equation; and the reaction rate decreased with the increasing of number of chlorine atoms of the PCNs. Products analysis proved that the photoconversion process of PCNs went through two stages, namely the initial stage of dechlorination and the later stage of oxidative ring opening. It was found that inorganic ions (NO3−, Cl−, Fe3+, and Fe2+) promoted or inhibited the photoconversion by generating or quenching of the reactive oxygen species, and chlorophyll a promoted the photoconversion through the generation of singlet oxygen.

Further discussion on the mechanism of hydrogen transfer in direct coal liquefaction

The hydrogen-donor solvent (H-donor) used in direct coal liquefaction (DCL) plays a critical role in both the oil yield and distribution of the products. However, the mechanism of the reaction between H-donor and coal in the DCL is unclear. In this study, the reaction of H-donor and coal in the DCL was investigated using the model compounds tetralin (H-donor) and diphenylmethane (DPM, coal). Density functional theory calculations were employed to examine both pyrolytic radical and solvent-mediated hydrogenolysis mechanisms. Based on the computed results, a modified solvent-mediated hydrogenolysis mechanism was proposed, namely the synergistic double-hydrogen-transfer mechanism, in which the β- and α-hydrogen atoms simultaneously transfer from tetralin to the ipso- and meta-carbon atoms of DPM. The calculated energy barriers of hydrogen transfer were lower than most of the bond dissociation enthalpies for coal. The energy barriers range of the synergistic double-hydrogen-transfer reaction did not correlate with the dissociation enthalpies of Caryl−Calkyl bond, although they were consistent with the order of the hydrogen-donating abilities of different solvents. This study may provide a theoretical guidance to improve the efficiency of H-donor in the DCL.

SYNTHESIS, THERMAL REACTIVITY, AND ANTIOXIDANT STUDIES OF AMINOGUANIDINIUM SALTS OF ASPARTIC AND GLUTAMIC ACIDS

Objective: Our main scope and objectives are to prepare aminoguanidinium salts of amino acids and to characterize them using analytical, IR, and thermal studies, to study the mode of thermal decomposition of aminoguanidinium salts, and to characterize the antioxidants behavior of aminoguanidinium salts.&#x0D; Methods: Elemental analysis for C, H, and N was performed on a Vario ELIII elemental analyzer. The IR spectra were recorded on a JASCO-4100 spectrophotometer as KBr pellets in the range of 400–4000 cm-1. The simultaneous TG-DTA studies were under taken on a PerkinElmer SII thermal analyzer and the curves obtained in air using platinum cups as holders with ~ 3 mg of the samples at the heating rate of 10°C/min. The antioxidant capacities of different salts were estimated according to the literature procedure.&#x0D; Results: Aspartic acid forms bis-aminoguanidinium salt, whereas glutamic acid forms both mono- and bis-aminogunidinium salts. The IR spectral data of the aminogunidinium salts of aforesaid acids show N-N stretching frequencies in the region 1110–1202 cm-1 revealing the presence of aminoguanidinium moiety.&#x0D; Conclusion: The antioxidant properties of these salts were studied using ferric reducing antioxidant power and phosphomolybdenum assay. Results showed significant ferric reducing power which indicated the hydrogen-donating ability of the extract.

EVALUATION OF TOCOLYTIC ACTIVITY OF AQUEOUS SEED EXTRACT OF SYZYGIUM CUMINI ON OXYTOCIN INDUCED PRETERM LABOR

Objective: The present investigation was aimed to determine the tocolytic activity of the aqueous seed extract of S. cumini (AESC) in animal models.&#x0D; Methods: The in vitro antioxidant activity of AESC was evaluated by (1, 1-diphenyl-2- picrylhydrazyl (α,α-diphenyl-β-picrylhydrazyl) and (2,2’-azino-bis(3- ethylbenzothiazoline-6-sulfonic acid) ABTS radical scavenging assay which showed the hydrogen donating and free radical scavenging activity of extract that aids in the prevention of preterm labor. In vivo tocolytic activity of AESC was evaluated. The level of in vivo antioxidant parameters such as catalase, superoxide dismutase (SOD) and glutathione was restored in the treated group compared to the control group. The AESC was subjected to pharmacological testing in vitro on a piece of isolated rat uterus previously pretreated with estradiol valerate, concentrations used were 80 mg/ml and 160 mg/ml.&#x0D; Results: The study showed the promising radical scavenging activity of the extract due to hydrogen-donating ability of the formulation. In the current study, a significant increase in the rate of preterm delivery (PTD) of the control animals was observed when compared with the normal group. The AESC treated group has showed a significant reduction in the rate of PTD which was comparable with the standard treated group as well as the normal group. The study reveals that the extracts have been able to increase the endogenous antioxidant enzyme activities while reducing the lipid peroxidation. The concentrations (80 mg/ml) and (160 mg/ml) produce 50.9% and 70.9 % inhibition, respectively.&#x0D; Conclusion: The results indicate the presence of active principles in the AESC which may be responsible for the tocolytic activity.

Insight into structural features of soluble portions from cellulose, cellobiose and monosaccharide methanolysis by GC/MS and ESI FTICRMS

Methanolysis of biomass has attracted increasing attention due to it has some advantages, such as low critical points and strong hydrogen donation ability. In this paper, methanolysis of cellulose, cellobiose (sucrose), and monosaccharide (glucose) were performed to obtain methanol-soluble portions (MSPs). The relatively volatile or less polar species in the MSPs were analyzed with a gas chromatograph/mass spectrometer (GC/MS), and the polar species were identified with a negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometer (FTICRMS). According to analysis with GC/MS, the MSPs include ethers, esters, ketones, acids, sugars, phenols, and furans. The analysis with FTICRMS shows that the polar compounds in the MSPs are O1–O15 class species with 1–14 double bond equivalent (DBE) and 5–35 carbon atom number (CAN). The most abundant class species in MSPs from cellulose, sucrose, and glucose methanolysis are O5, O7, and O7, respectively. The species in MSPs from sucrose and glucose methanolysis center at higher DBE value and more CAN than those in MSP from cellulose methanolysis. Meanwhile, the oxygen atom number of O4–O10 class species in the MSPs were negatively correlated with the average DBE value. The results indicate that condensation intensively proceeded with the specific regularity during sucrose and glucose methanolysis.

Mesophase pitch production from FCC slurry oil: Optimizing compositions and properties of the carbonization feedstock by slurry-bed hydrotreating coupled with distillation

Slurry-bed hydrotreating coupled with distillation may optimize the compositions and properties of heavy oils, including improving their hydrogen-donating ability of heavy oils. The effects of slurry-bed hydrotreating coupled with distillation on the compositions and properties of FCC slurry oil were determined by various analytical methods. 1H NMR was used to characterize and determine the hydrogen-donating ability of FCC slurry oil, and the structure of mesophase pitches formed by carbonization of FCC slurry oil were characterized by polarizing microscope, softening point and X-ray diffraction method. The results showed that slurry-bed hydrotreating obviously prevents FCC slurry oil from coking behavior during the distillation process, and overall compositions and properties of FCC slurry oil after optimization meet the requirements for producing mesophase pitch. Most importantly, the hydrogen-donating ability of FCC slurry was drastically increased from 0.392 (mg-H/g-Oil) to 1.917 (mg-H/g-Oil). In turn, in contrast with the raw FCC slurry oil, the slurry oil after the slurry-bed hydrotreating coupled with distillation easily formed mesophase pitch with a large flow domain structure, low softening point, and ordered microcrystal structure through carbonization. Thus, the purpose of preparing high-quality mesophase pitch was achieved.

Preparation of hydrogen donor solvent for asphaltenes efficient liquid-phase conversion via heavy cycle oil selective hydrogenation

Hydrogen donor solvents are the active hydrogen source for asphaltenes liquid-phase hydroconversion, in which the naphthenic aromatics are the ideal hydrogen donating components. Heavy cycle oil (HCO), produced by fluid catalytic cracking (FCC) containing a large amount of polycyclic aromatic hydrocarbons (PAHs), has a low hydrogen-donating ability (HDA). The aim of this paper is to improve the HDA of HCO by selective hydrogenation. On the basis of HDA analysis, proton nuclear magnetic resonance (1H-NMR)data and average molecular structure parameters, the effect of reaction conditions on HDA were investigated to confirm the essence of hydrogen donating performance. Through asphaltenes liquid-phase hydroconversion experiments, and using hydrogenated HCO (Hy-HCO) as the hydrogen donor solvent, asphaltenes conversion was effectively improved and coke yield was greatly reduced. After selective hydrogenation, the low-value HCO obtained the key components via selective hydrogenation, thereby becoming an optimal hydrogen donor solvent for asphaltenes conversion. Hydrocarbon composition analysis showed that naphthenebenzenes with the maximal HDA was a key component for hydrogen donating performance of Hy-HCO for asphaltenes hydroconversion.

Exploration of antioxidant capacity of extracts of Perna viridis, a marine bivalve

Background: The biopotential of Malaysian green mussels (Perna viridis) has not been fully explored. The aim of the study is to screen the antioxidant capacity of extracts of Malaysian green mussels. Materials and Methods: Mussels were extracted by using solvents such as water, methanol, and ethanol, and methods such as microwave-assisted extraction (MAE) and animal tissue homogenization (ATH) were employed. The percentage yield, total protein content (TPC), total phenolic content, trace element analysis, and biochemical screening of extracts were carried out. The antioxidant capacity of the extracts was assessed by 2,2,-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) assay, 2,2'-azino-bis[3-ethylbenzothiazoline-6-sulfonic acid] (ABTS) assay, hydrogen peroxide scavenging assay, and ferric-reducing antioxidant power (FRAP) methods. Results: The yield of extracts prepared by MAE methods was higher than the extracts prepared by ATH methods. The total phenolic contents and TPC were higher in the extracts prepared by ATH method than those prepared by MAE methods. Biochemical screening results revealed the presence of alkaloids, phenolic compounds, and saponins. The percentage radical scavenging and inhibitory concentration50(IC50) values of all extracts were found to be lesser than the standard. Results showed that extracts by ATH methods displayed high antioxidant activity than extracts by MAE methods. The methanolic extracts of P. viridis showed better antioxidant capacity than other extracts in DPPH and ABTS assay methods, whereas the ethanolic extracts displayed high antioxidant activity than other extracts in hydrogen peroxide and FRAP assay methods. The antioxidant activity of the extracts could be attributed to the hydrogen-donating ability of bioactive peptides, phenolic compounds, alkaloids, reducing sugars, and trace elements present in such extracts. Conclusion: The results of the present study lay the platform to isolate newer antioxidants from Malaysian green mussels. It is concluded that extensive mechanistic studies are imminent to ascertain the molecular mechanism involved in the antioxidant activity of such extracts.