Preparation of non‐covalent Metalloporphyrin/C60 Composite and its Electrocatalysis to Hydrogen Peroxide
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Abstract Three non‐covalent metallotetraphenylporphyrin/fullerene (MTPPS 4 (M=Zn 2+ , Fe 2+ , Co 2+ )/C 60 ) nanocomposites were prepared by π‐π molecular interaction and characterized by scanning electron microscopy and UV‐Vis absorption spectroscopy. Electrocatalytic studies indicated that the MTPPS 4 /C 60 nanocomposites which were embedded in TOAB film on the glassy carbon electrode (GCE) (TOAB/MTPPS 4 /C 60 /GCE) exhibited a high electrocatalytic activity for H 2 O 2 . MTPPS 4 enhanced the electrocatalytic ability of C 60 in the increasing order of TOAB/ZnTPPS 4 /C 60 /GCE, TOAB/FeTPPS 4 /C 60 /GCE and TOAB/CoTPPS 4 /C 60 /GCE. The measurement with the differential pulse voltammetry (DPV) exhibited that there is a well‐defined linear relationship between the reduction currents and H 2 O 2 concentrations in the range from 0.3 to 1.0 mM, with the detection limit of 0.07 mM at the TOAB/ZnTPPS 4 /C 60 /GCE electrode, of 0.08 mM at the TOAB/FeTPPS 4 /C 60 /GCE electrode, of 0.04 mM at the TOAB/CoTPPS 4 /C 60 /GCE electrode, respectively. The biosensors showed a good anti‐interfering ability towards glucose, ascorbic acid and L‐cysteine and a high potential practicality.Keywords:
Differential pulse voltammetry
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Values for the ascorbic acid content in the tubers of nine potato varieties have been compared. The effects of different fertilizers have been studied. Location of plots throughout the province was considered. Changes in ascorbic acid content due to tuber maturity and storage time have been measured at regular intervals. The relative amounts of ascorbic acid in the stem and eye ends of tubers have been found. Effects of top-killers on the ascorbic acid content of tubers were noted. No relationship was observed between the ascorbic acid content and either variety or fertilizer. The highest values for ascorbic acid were obtained in August. Losses during maturity and storage were continuous and fairly regular. Top-killers produced no apparent effect on the ascorbic acid content of tubers. The eye end of the potato tuber contained approximately 20% more ascorbic acid than the stem end.
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ABSTRACT Effects of two types of mechanical injury (wounding and bruising) on the ascorbic acid content of Belrus cultivar tubers were compared. Wounding involved cutting slices (1 mm) and strips (10 × 20 mm) and both slices and strips exhibited a highly significant increase (p < 0.01) in ascorbic acid following wounding. The largest increase (400%) occurred in slices after 2 days. Ascorbic acid decreased significantly (p < 0.05) in the bruised halves as compared with the unbruised halves. Maximum decrease in ascorbic acid (347%) of bruised tissue occurred after 2 days storage at 5°C. The unbruised halves appeared to synthesize ascorbic acid when compared with the controls, the maximum increase (144%) occurring after 2 days storage at 5°C.
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Electrocatalysis as a catalytic process involving oxidation or reduction through the direct transfer of electrons is of key importance subject in various fields of chemistry and associated sciences. Heterogeneous electrocatalysis is especially important to the development of water oxidation and fuel cells catalysts. This paper presents the brief description of the electrocatalysis and the mechanism of electrochemical reactions. Different factors and their influence on electrocatalytic activity, have been discussed. Role of nanoparticles in electrocatalysis received a particular emphasis. Long-term tasks of electrocatalysis were also definied.
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Metal-organic framework (MOF) based composite materials have attracted significant research interest in the electrocatalytic field. In this study, a carbonized polypyrrole coated MOF composite electrocatalyst ([email protected]) is developed, which is a nitrogen-modified MOF-based carbon used as non-precious oxygen reduction reaction (ORR) electrocatalyst. Physical characterizations prove that the [email protected] electrocatalyst has high nitrogen doping (2.53 at.%) and effective graphite and pyridinium nitrogen doping (86.6%). When compared with commercial Pt/C, as-obtained [email protected] electrocatalyst shows good ORR performance (∆E1/2 = −22 mV) with good stability (87.8%) and methanol tolerance. All results indicate that MOF-based [email protected] electrocatalyst is an effective and promising electrocatalyst for ORR.
Carbon fibers
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Guinea pigs were given ascorbic acid orally in two doses; a low and a high dose. The tissue levels of ascorbic acid-2-sulphate was estimated in these animals after 15 days of feeding and a subsequent deprivation period of 15 days. The specific activity of the enzymes ascorbic acid sulphotransferase and ascorbic acid-2-sulphate sulphohydrolase was studied. During higher ascorbic acid intake, the activity of ascorbic acid sulphotransferase was increased, whereas ascorbic acid-2-sulphate sulphohydrolase showed a decreased activity. But when ascorbic acid intake was lowered or ceased, the activity of the above enzymes showed a reverse pattern. Possible reasons for the lack of antiscorbutic activity of ascorbic acid-2-sulphate in guinea pigs is discussed.
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Guinea pigs were given ascorbic acid orally in two doses; a low and a high dose. The tissue levels of ascorbic acid-2-sulphate was estimated in these animals after 15 days of feeding and a subsequent deprivation period of 15 days. The specific activity of the enzymes ascorbic acid sulphotransferase and ascorbic acid-2-sulphate sulphohydrolase was studied. During higher ascorbic acid intake, the activity of ascorbic acid sulphotransferase was increased, whereas ascorbic acid-2-sulphate sulphohydrolase showed a decreased activity. But when ascorbic acid intake was lowered or ceased, the activity of the above enzymes showed a reverse pattern. Possible reasons for the lack of antiscorbutic activity of ascorbic acid-2-sulphate in guinea pigs is discussed.
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식품 가공방법에 따른 ascorbic acid의 손실정도를 알아보기 위해 순수 ascorbic acid 수용액과 식품 중 ascorbic acid의 함량이 높은 귤을 감마선 조사처리(1, 3, 5, 7 및 10 kGy)와, LTLT(63℃ㆍ30분), HTST(72℃ㆍ15초) 및 멸균(121℃ㆍ15분, 15 lb)조건의 가열처리 및 마이크로웨이브 처리 후 ascorbic acid의 함량변화를 살펴보았다. 1~10 kGy의 선량으로 감마선 조사한 ascorbic acid 수용액 및 귤에서의 ascorbic acid 함량은 각각 27.4~44.9% 및 6.9~21.9%, 가열처리는 22.5~36.8% 및 4.5~18.1%, 1~3분 동안 마이크로웨이브 처리시에는 23.1~47.4% 및 6.5~22.6%의 손실율을 나타내었다.
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The method of ascorbic acid determination was explored on the electro-activated glassy carbon electrode surface via the method of differential pulse voltammetry.The experiment of cyclic voltammetry shows that ascorbic acid can be oxidized by the electro-activated glassy carbon electrode.While the oxidation peak current will increase with the increase of ascorbic acid concentration.Additionally,the results from the experiment of differential pulse demonstrate that ascorbic acid has high electrical activity in HAc-NaAc buffer system(pH=3.73,1 mol/L).Under the optimal conditions,the differential pulse current density is linearly dependent on the concentration of ascorbic acid within the range of 0-0.08 g/L.The linear regression equation is: i=9.256c+1.085,r=0.998 2.The method reported here can be used for the determination of the ascorbic acid concentration,and the recovery rate of experiment was 98.6%-104.0%.
Differential pulse voltammetry
Buffer solution
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La 0.6 Ca 0.4 CoO 3 perovskite electrocatalyst had been synthesized by organic acid-aided method. The impact of the cal-cining conditions on the electrocatalyst preparation was studied by XRD, TEM and optimal results were given. The perfor-mance of bifunctional oxygen electrode electrocatalyst was evaluated preliminarily by galvanostatic polarization curve method. The results show that the electrocatalyst synthesized at 700 ℃for 2h has the characteristics of single phase, single crystal and smaller grain size, so the condition is optimal for preparing the electrocatalyst. The electrocatalyst made under that condition has better bifunctional oxygen electrode electrocatalytic activity and stability, which is promising as bifunctional oxygen elec-trode electrocatalyst for the MH-Air secondary battery application.
Clark electrode
Oxygen evolution
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