The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform

C Namasivayam - One of the best experts on this subject based on the ideXlab platform.

Gowchin Yen - One of the best experts on this subject based on the ideXlab platform.

  • antioxidant efficacy of methanolic extracts of Peanut Hulls in soybean and Peanut oils
    Journal of the American Oil Chemists' Society, 1997
    Co-Authors: Pin Der Duh, Gowchin Yen
    Abstract:

    Antioxidant activity of methanolic extracts of Peanut Hulls (MEPH) was evaluated in soybean and Peanut oils after accelerated oxidation at 60°C. Results showed that the oils with 0.12, 0.48, and 1.20% MEPH had significantly (P<0.05) lower peroxide values and acid values than the control after storage at 60°C. Moreover, oils with 0.48 and 1.20% MEPH were significantly (P<0.05) superior to 0.02% butylated hydroxyanisole (BHA) in reducing oxidation of both oils. Negative synergism was observed when 0.48 and 1.20% MEPH were mixed with 0.01% dl-α-tocopherol or 0.01% BHA in soybean oil compared to MEPH alone.

  • antimutagenic effect of methanolic extracts from Peanut Hulls
    Bioscience Biotechnology and Biochemistry, 1996
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The antimutagenic effects of methanolic extracts of Peanut Hulls (MEPH) were evaluated by the Ames test. MEPH inhibited the mutagenicity of 4-nitroquinoline-N-oxide (NQNO), a direct-acting mutagen. MEPH also inhibited the mutagenicity of some indirect-acting mutagens and decreased in the order of 2-amino-3-methylimidazo(4,5-f)quinoline (IQ)>aflatoxin B1 (AFB1)>2-amino-6-methyldipyrido(1,2-a : 3′, 2′-d)imidazole (Glu-P-1) > 3-amino-1,4-dimethyl-5H-pyridol(4,3-b)indole (Trp-P-1) > benzo(a)pyrene (B(a)P) for 5. typhimurium TA98, and IQ > Trp-P-1 > Glu-P-1 > AFB1 > B(a)P for S. typhimurium TA100.

  • antioxidant activity of methanolic extracts of Peanut Hulls from various cultivars
    Journal of the American Oil Chemists' Society, 1995
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The antioxidant activities of methanolic extracts of Peanut Hulls (MEPH) from various cultivars (Spanish, Valencia, Runner, and Virginia) were investigated. The luteolin content in MEPH for Spanish, Valencia, Runner, and Virginia was 3.16, 2.47, 0.95, and 0.75 mg/g of Hulls, and the total phenolic content was 10.2, 10.1, 6.6, and 4.2 mg/g of Hulls, respectively. MEPH from various cultivars showed similar and strong antioxidant activity as a result of a high content of total phenolic compounds. Based on these results, the Hulls of Spanish cultivar were selected as the best antioxidant material among the four cultivars because of the cultivar’s highest content in both luteolin and total phenolic compounds.

  • changes in antioxidant activity and components of methanolic extracts of Peanut Hulls irradiated with ultraviolet light
    Food Chemistry, 1995
    Co-Authors: Pin Der Duh, Gowchin Yen
    Abstract:

    Abstract The antioxidant activity and the variations of components in methanolic extracts of Peanut Hulls (MEPH) after UV irradiation were investigated. MEPH of varied periods of irradiation (0, 3 and 6 days), exhibited 96.0% inhibition of peroxidation of linoleic acid. The relative remaining ratios of luteolin in MEPH after irradiation for 3 and 6 days were 87.9% and 69.5%, respectively, and those of total phenolic compounds were 96.5% and 90.4%, respectively. MEPH irradiated for 0, 3 and 6 days exhibited a similarly marked antioxidant activity as a result of a large content of total phenolic compounds. MEPH of varied periods of irradiation always showed the same UV-vis spectra and Rf values on a TLC plate. Thus the antioxidant activity of MEPH was unaffected by UV irradiation.

  • scavenging effect of methanolic extracts of Peanut Hulls on free radical and active oxygen species
    Journal of Agricultural and Food Chemistry, 1994
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The scavenging effect of methanolic extracts of Peanut Hulls (MEPH) on free-radical and active-oxygen species was investigated. MEPH showed marked activity as a radical scavenger in the experiment using 14,1-diphenyl-2-picrylhydrazyl radical, indicating that MEPH has effective activities as a hydrogen donor and as a primary antioxidant to react with lipid radicals. MEPH also possessed antioxidative activity toward hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 .- ), indicating that MEPH has a scavenging activity on H 2 O 2 and O 2 .- . The scavenging effect of MEPH on hydroxyl radical was investigated by means of electron paramagnetic resonance spectrometry

Sonia Figueiredo - One of the best experts on this subject based on the ideXlab platform.

  • copper nickel and zinc removal by Peanut Hulls batch and column studies in mono tri component systems and with real effluent
    Global Nest Journal, 2010
    Co-Authors: Franceliusa Delys De Oliveira, A D Soares, Olga M Freitas, Sonia Figueiredo
    Abstract:

    The main goal of this research study was the removal of Cu(II), Ni(II) and Zn(II) from aqueous solutions using Peanut Hulls. This work was mainly focused on the following aspects: chemical characterization of the biosorbent, kinetic studies, study of the pH influence in mono-component systems, equilibrium isotherms and column studies, both in mono and tri-component systems, and with a real industrial effluent from the electroplating industry. The chemical characterization of Peanut Hulls showed a high cellulose (44.8%) and lignin (36.1%) content, which favours biosorption of metal cations. The kinetic studies performed indicate that most of the sorption occurs in the first 30 min for all systems. In general, a pseudo-second order kinetics was followed, both in mono and tri-component systems. The equilibrium isotherms were better described by Freundlich model in all systems. Peanut Hulls showed higher affinity for copper than for nickel and zinc when they are both present. The pH value between 5 and 6 was the most favourable for all systems. The sorbent capacity in column was 0.028 and 0.025 mmol g -1 for copper, respectively in mono and tri-component systems. A decrease of capacity for copper (50%) was observed when dealing with the real effluent. The Yoon-Nelson, Thomas and Yan’s models were fitted to the experimental data, being the latter the best fit.

  • copper and lead removal by Peanut Hulls equilibrium and kinetic studies
    Desalination, 2009
    Co-Authors: Franceliusa Delys De Oliveira, Olga M Freitas, J H Paula, Sonia Figueiredo
    Abstract:

    Abstract This research work aims to study the use of Peanut Hulls, an agricultural and food industry waste, for copperand lead removal through equilibrium and kinetic parameters evaluation. Equilibrium batch studies were performedin a batch adsorber. The influence of initial pH was evaluated (3–5) and it was selected between 4.0and 4.5. The maximum sorption capacities obtained for the Langmuir model were 0.21 ± 0.03 and 0.18 ± 0.02mmol/g, respectively for copper and lead. In bi-component systems, competitive sorption of copper and leadwas verified, the total amount adsorbed being around 0.21 mmol of metal per gram of material in both monoand bi-component systems. In the kinetic studies equilibrium was reached after 200 min contact time using a400 rpm stirring rate, achieving 78% and 58% removal, in mono-component system, for copper and lead respectively.Their removal follows a pseudo-second-order kinetics. These studies show that most of the metals removaloccurred in the first 20 min of contact, which shows a good uptake rate in all systems.

Pin Der Duh - One of the best experts on this subject based on the ideXlab platform.

  • antioxidant efficacy of methanolic extracts of Peanut Hulls in soybean and Peanut oils
    Journal of the American Oil Chemists' Society, 1997
    Co-Authors: Pin Der Duh, Gowchin Yen
    Abstract:

    Antioxidant activity of methanolic extracts of Peanut Hulls (MEPH) was evaluated in soybean and Peanut oils after accelerated oxidation at 60°C. Results showed that the oils with 0.12, 0.48, and 1.20% MEPH had significantly (P<0.05) lower peroxide values and acid values than the control after storage at 60°C. Moreover, oils with 0.48 and 1.20% MEPH were significantly (P<0.05) superior to 0.02% butylated hydroxyanisole (BHA) in reducing oxidation of both oils. Negative synergism was observed when 0.48 and 1.20% MEPH were mixed with 0.01% dl-α-tocopherol or 0.01% BHA in soybean oil compared to MEPH alone.

  • antimutagenic effect of methanolic extracts from Peanut Hulls
    Bioscience Biotechnology and Biochemistry, 1996
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The antimutagenic effects of methanolic extracts of Peanut Hulls (MEPH) were evaluated by the Ames test. MEPH inhibited the mutagenicity of 4-nitroquinoline-N-oxide (NQNO), a direct-acting mutagen. MEPH also inhibited the mutagenicity of some indirect-acting mutagens and decreased in the order of 2-amino-3-methylimidazo(4,5-f)quinoline (IQ)>aflatoxin B1 (AFB1)>2-amino-6-methyldipyrido(1,2-a : 3′, 2′-d)imidazole (Glu-P-1) > 3-amino-1,4-dimethyl-5H-pyridol(4,3-b)indole (Trp-P-1) > benzo(a)pyrene (B(a)P) for 5. typhimurium TA98, and IQ > Trp-P-1 > Glu-P-1 > AFB1 > B(a)P for S. typhimurium TA100.

  • antioxidant activity of methanolic extracts of Peanut Hulls from various cultivars
    Journal of the American Oil Chemists' Society, 1995
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The antioxidant activities of methanolic extracts of Peanut Hulls (MEPH) from various cultivars (Spanish, Valencia, Runner, and Virginia) were investigated. The luteolin content in MEPH for Spanish, Valencia, Runner, and Virginia was 3.16, 2.47, 0.95, and 0.75 mg/g of Hulls, and the total phenolic content was 10.2, 10.1, 6.6, and 4.2 mg/g of Hulls, respectively. MEPH from various cultivars showed similar and strong antioxidant activity as a result of a high content of total phenolic compounds. Based on these results, the Hulls of Spanish cultivar were selected as the best antioxidant material among the four cultivars because of the cultivar’s highest content in both luteolin and total phenolic compounds.

  • changes in antioxidant activity and components of methanolic extracts of Peanut Hulls irradiated with ultraviolet light
    Food Chemistry, 1995
    Co-Authors: Pin Der Duh, Gowchin Yen
    Abstract:

    Abstract The antioxidant activity and the variations of components in methanolic extracts of Peanut Hulls (MEPH) after UV irradiation were investigated. MEPH of varied periods of irradiation (0, 3 and 6 days), exhibited 96.0% inhibition of peroxidation of linoleic acid. The relative remaining ratios of luteolin in MEPH after irradiation for 3 and 6 days were 87.9% and 69.5%, respectively, and those of total phenolic compounds were 96.5% and 90.4%, respectively. MEPH irradiated for 0, 3 and 6 days exhibited a similarly marked antioxidant activity as a result of a large content of total phenolic compounds. MEPH of varied periods of irradiation always showed the same UV-vis spectra and Rf values on a TLC plate. Thus the antioxidant activity of MEPH was unaffected by UV irradiation.

  • scavenging effect of methanolic extracts of Peanut Hulls on free radical and active oxygen species
    Journal of Agricultural and Food Chemistry, 1994
    Co-Authors: Gowchin Yen, Pin Der Duh
    Abstract:

    The scavenging effect of methanolic extracts of Peanut Hulls (MEPH) on free-radical and active-oxygen species was investigated. MEPH showed marked activity as a radical scavenger in the experiment using 14,1-diphenyl-2-picrylhydrazyl radical, indicating that MEPH has effective activities as a hydrogen donor and as a primary antioxidant to react with lipid radicals. MEPH also possessed antioxidative activity toward hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 .- ), indicating that MEPH has a scavenging activity on H 2 O 2 and O 2 .- . The scavenging effect of MEPH on hydroxyl radical was investigated by means of electron paramagnetic resonance spectrometry

Shengfu Wang - One of the best experts on this subject based on the ideXlab platform.

  • sensitive electrochemical determination of luteolin in Peanut Hulls using multi walled carbon nanotubes modified electrode
    Food Chemistry, 2011
    Co-Authors: Dongming Zhao, Xiuhua Zhang, Lijun Feng, Shengfu Wang
    Abstract:

    Abstract A simple and highly sensitive electrochemical method was developed for the determination of trace-level luteolin, based on the multi-walled carbon nanotubes (MWNTs) modified glassy carbon electrode (GCE). The electrochemical behaviours of luteolin indicate that MWNTs modified glassy carbon electrode (MWNTs/GCE) can greatly enhance the electrocatalytic activity towards the redox of luteolin. It leads to a considerable improvement of the redox peak current for luteolin and allows the development of a highly sensitive voltammetric sensor for the determination of luteolin. A series of experimental parameters including the pH of supporting electrolyte, accumulation potential and time were optimised. The results showed that the oxidative peak currents increased linearly with the concentration of luteolin in the range of 2.0 × 10 −10 to 3.0 × 10 −9  M, with a detection limit of 6.0 × 10 −11  M ( S / N  = 3). The analytical performance of this sensor has been evaluated for detection of luteolin in Peanut Hulls as a real sample.