scholarly journals Cold Plasma as an Innovative Construction Method of Voltammetric Biosensor Based on Laccase

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4086 ◽  
Author(s):  
Szymon Malinowski ◽  
Cecylia Wardak ◽  
Justyna Jaroszyńska-Wolińska ◽  
P. Herbert ◽  
Rafał Panek
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Polymerization ◽  
Deposition Time ◽  
Layer Deposition ◽  
One Step ◽  
Laccase Enzyme ◽  
The One ◽  
Current Science ◽  
Huge Challenge

Development of new, faster methods of biosensor construction is a huge challenge for current science and industry. In this work, biosensor construction was carried out using a new soft plasma polymerization (SPP) method in which a bio-recognition layer of laccase enzyme was polymerized and bonded to a glassy carbon electrode (GCE) substrate under atmospheric pressure with a corona discharge jet. Laccase belongs to the oxidoreductase enzyme group with four copper atoms in its active center. Application of the corona SPP plasma method allows reduction of the time needed for biosensor construction from several hours to minutes. The presented work includes optimization of the laccase bio-recognition layer deposition time, structural studies of the deposited laccase layer, as well as study of the fabricated biosensor applicability for the determination of Rutin in real pharmaceutical samples. This method produces a biosensor with two linear ranges from 0.3 μmol/dm3 to 0.5 μmol/dm3 and from 0.8 μmol/dm3 to 16 μmol/dm3 of Rutin concentration. Results shown in this work indicate that application of the one-step, corona SPP method enables biosensor construction with comparable analytical parameters to biosensors fabricated by conventional, multi-step, wet methods.

Effects of the support on bifunctional one-step synthesis of methylal via methanol oxidation catalysed by Fe–Mo-based bifunctional catalysts

2021 ◽  
Vol 5 (1) ◽  
pp. 246-260
Author(s):  
Meng Yuan ◽  
Ruiyuan Tang ◽  
Xiangyu Sun ◽  
Zhimei Zhang ◽  
Yuanyu Tian ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Methanol Conversion ◽  
Bifunctional Catalysts ◽  
One Step ◽  
The One ◽  
Huge Challenge

In the one-step preparation of methylal from methanol, achieving high methanol conversion and high methylal yield is a huge challenge.

Simultaneous analysis of fluorescence decay curves for the one-step determination of the mean aggregation number of aqueous micelles

1988 ◽  
Vol 146 (3-4) ◽  
pp. 337-342 ◽  
Author(s):  
Noël Boens ◽  
Hongwen Luo ◽  
Mark van der Auweraer ◽  
Steven Reekmans ◽  
Frans C. De Schryver ◽  
...  
Keyword(s):  
Aggregation Number ◽  
Fluorescence Decay ◽  
Simultaneous Analysis ◽  
One Step ◽  
The Mean ◽  
The One ◽  
Aqueous Micelles

Facile Synthesis of the Chalcones and Dihydrochalcones from Naringin, Neohesperidin and Hesperidin

1975 ◽  
Vol 30 (7-8) ◽  
pp. 606-608 ◽  
Author(s):  
H. A. B. Linke ◽  
D. E. Eveleigh
Keyword(s):  
Atmospheric Pressure ◽  
Molecular Hydrogen ◽  
Room Temperature ◽  
Facile Synthesis ◽  
One Step ◽  
The One

The flavanone glycosides naringin, neohesperidin and hesperidin were converted chemically to the corresponding chalcones and dihydrochalcones; the one-step synthesis, performed at room temperature, required the presence of 25% KOH in the reaction mixture for the former and 10% KOH, a catalyst and molecular hydrogen at atmospheric pressure for the latter.

Barometrical observations, showing the effect of the direction of the wind on the difference between distant barometers

1843 ◽  
Vol 4 ◽  
pp. 386-387
Keyword(s):  
Atmospheric Pressure ◽  
The North ◽  
Heating And Cooling ◽  
Westerly Winds ◽  
Different Seasons ◽  
The Subject ◽  
The Difference ◽  
The Times ◽  
The One

The author institutes a comparison between the barometric heights as observed at the Apartments of the Royal Society, and at his house in Herefordshire, in the neighbourhood of Ross, with a view to ascertain the influence of prevailing winds on the atmospheric pressure. The barometers thus compared together were of the same construction, and by the same maker; and the times of observation, namely nine o’clock a. m. and three o’clock p. m., were the same at both places, the distance between which is 110 miles in longitude, and about 20 in latitude. The degree of accordance in the march of the two barometers is exhibited by that of curves traced on three sheets accompanying the paper. The results are given in eight tables. The author agrees with Schubler in ascribing the currents prevailing in the atmosphere to the variable relations of heating and cooling which obtains between the Atlantic Ocean and the continent of Europe at different seasons; the facts ascertained by the series of observations here presented being in accordance with that hypothesis. If the northerly and westerly winds in England be partly the effect of the expansion of the air on the continent, then the barometer which is nearest to the continent, or in this instance that at London, ought to be relatively more depressed than the one more distant; or if the southerly and easterly winds be regarded as proceeding to the ocean, then, for a similar reason, the barometer nearest to the ocean ought to be relatively depressed; and that both these effects are produced, is shown by the tables. This view of the subject also, the author remarks, is corroborated by Raymond’s observations, detailed in his memoir on the determination of the height of Clermont Ferrand, from which it appears that with the north winds, the southern barometer was most depressed; while the reverse occurred with the southerly winds.

Mechanism of the Acicular Nanosize Mg,Al-Hydrotalcite Grain Growth under Hydrothermal Conditions

2007 ◽  
Vol 280-283 ◽  
pp. 489-494
Author(s):  
Qing Li Ren ◽  
Qiang Luo ◽  
Wei Chen
Keyword(s):  
Growth Mechanism ◽  
Atmospheric Pressure ◽  
Growth Unit ◽  
Growth Theory ◽  
Test Results ◽  
Hydrothermal Conditions ◽  
Reaction Method ◽  
Liquid Reaction ◽  
One Step ◽  
The One

The highly pure acicular nanosize Mg,Al-hydrotalcite was synthesized by the one-step liquid reaction method at atmospheric pressure. The favorable growth unit in the reaction liquid, the requirements of Al3+ entering the Mg2+-(OH-)6 octahedral and forming the growth unit M-(OH-1)6 (M=Mg2+, Al3+) and growth mechanism that the nanosize Mg,Al-hydrotalcite crystal embryo follows are studied according to the test results of XRD, TEM, SEM and IR. Later, that the nanosize Mg,Alhydrotalcite crystal embryo growth follows the gathering growth theory was deeply investigated.

Aptasensor for the simple detection of ochratoxin A based on side-by-side assembly of gold nanorods

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 50437-50443 ◽  
Author(s):  
Xia Xu ◽  
Chengnan Xu ◽  
Yibin Ying
Keyword(s):  
Ochratoxin A ◽  
Gold Nanorods ◽  
Simple Detection ◽  
One Step ◽  
The One

A new aptasensor based on the side-by-side assembly of gold nanorods (GNRs) was studied for the one-step determination of ochratoxin A (OTA).

A Ratiometric Fluorescent Probe Based on Carbon Dots and Bimetallic Nanoclusters for the Assay of Copper Gluconate and Copper Sulfate

NANO ◽  
2021 ◽  
pp. 2150114
Author(s):  
Yucong Fan ◽  
Weihua Yu ◽  
Yue Hu ◽  
Yunwen Liao ◽  
Xiaohui Jiang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Molar Ratio ◽  
Cupric Sulfate ◽  
Selective Determination ◽  
Bimetallic Nanoclusters ◽  
One Step ◽  
The One

Doping Ag-enhanced and glutathione-stabilized Au nanoclusters (GSH–Ag/AuNCs) were prepared by the one-step ultraviolet radiation combined with microwave heating method. The effects of the molar ratio of Au–Ag and different types of energy suppliers on the fluorescent performance of GSH–Ag/AuNCs were studied in detail. After that, a new ratio fluorescent probe (RF-probe) based on the mixing of GSH–Ag/AuNCs with carbon dots (CDs) was designed for sensitive and selective determination of copper gluconate (CG) and cupric sulfate (CS). For the CDs–GSH–Ag/AuNCs RF-probe, the fluorescence (FL) of CDs (at 440[Formula: see text]nm) and that of alloy nanoclusters (NCs) (at 605[Formula: see text]nm) were, respectively, unaffected and strongly quenched in the presence of CG/CS at [Formula: see text][Formula: see text]nm coming from the dynamic quenching process. Corresponding linear ranges and limit of detection (LOD) of the RF-probe for the CG/CS assay were estimated to be 0.17–6.20/0.17–5.62[Formula: see text][Formula: see text]mol/L and 16.80/15.95[Formula: see text]nmol/L, respectively. Furthermore, the proposed RF-probe was successfully used for the assays of CG in CG tablets and CG additive, and CS in infant formula and CS additive, respectively.

Preparation and Thermal Decomposition Mechanism of Zn2+-Doped Mg,Al-Hydrotalcite Nanocrystalline

2007 ◽  
Vol 336-338 ◽  
pp. 2071-2073 ◽  
Author(s):  
Qing Li Ren ◽  
Qiang Luo
Keyword(s):  
Thermal Decomposition ◽  
Atmospheric Pressure ◽  
Thermal Decomposition Mechanism ◽  
Test Results ◽  
Reaction Method ◽  
Liquid Reaction ◽  
Thermal Mechanism ◽  
One Step ◽  
Preparation And Thermal Decomposition ◽  
The One

The highly pure nanocrystalline Mg,Al-hydrotalcite with Zn2+ doping was synthesized by the one-step liquid reaction method at atmospheric pressure. And the preparation of the Zn2+-doped Mg,Al-hydrotalcite nanocrystalline was investigated according to the results of XRD, TEM, IR and DSC. Moreover, based on the DSC test results, the thermal mechanism functions of the Mg,Al-hydrotalcite with Zn2+ doping are studied in detail after calculation and comparison.

Sign in / Sign up

Export Citation Format

Share Document