Highly sensitive nanoplatform based on green gold sononanoparticles for phenol determination in olive oil

2021 ◽  
Author(s):  
Siwar Jebril ◽  
Alfonso Sierra-Padilla ◽  
Juan José García-Guzmán ◽  
Laura Cubillana-Aguilera ◽  
José María Palacios-Santander ◽  
...  
Keyword(s):  
Olive Oil ◽  
Highly Sensitive ◽  
Phenol Determination

Highly sensitive biosensing of phenol based on the adsorption of the phenol enzymatic oxidation product on the surface of an electrochemically reduced graphene oxide-modified electrode

2018 ◽  
Vol 10 (23) ◽  
pp. 2731-2739 ◽  
Author(s):  
Amir Kaffash ◽  
Hamid R. Zare ◽  
Khosrow Rostami
Keyword(s):  
Graphene Oxide ◽  
Horseradish Peroxidase ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Enzymatic Oxidation ◽  
Reduced Graphene ◽  
Highly Sensitive ◽  
Electrochemically Reduced Graphene Oxide ◽  
Phenol Determination ◽  
Peroxidase Enzyme

An electrochemically reduced graphene oxide and horseradish peroxidase enzyme modified electrode has been used for phenol determination.

scholarly journals Food Analysis: Task specific ionic liquids for separation of nickel and cadmium from olive oil samples by thermal ultrasound-assisted dispersive multiphasic microextraction

2019 ◽  
Vol 2 (2) ◽  
pp. 55-64 ◽  
Author(s):  
Asian Khaligh ◽  
Hamid Shirkhanloo
Keyword(s):  
Olive Oil ◽  
Limit Of Detection ◽  
Hydroxycinnamic Acid ◽  
Extraction And Separation ◽  
Analysis Task ◽  
Highly Sensitive ◽  
Ultrasound Assisted ◽  
Optimized Conditions ◽  
Extracting Solvent ◽  
Task Specific Ionic Liquid

A novel task-specific ionic liquid (TSILs) was used for highly sensitive extraction and separation of nickel and cadmium in olive oil by thermal ultrasound-assisted dispersive multiphasic microextraction (TUSA-DMPμE). By proposed method, a mixture containing of hydrophilic TSILs (α- Cyano-4-hydroxycinnamic acid diethylamine; [CHCA] [DEA] and 1-(2-Hydroxyethyl)-3-methylimidazolium tetrafluoroborate; [HEMIM][BF4]) as a complexing and extracting solvent, acetone as a dispersant of TSILs was added to diluted olive oil with n-hexane containing Cd (II) and Ni (II) that was already complexed by TSILs in 60OC at pH 6.0-7.5. After optimized conditions, the enrichment factor (EF), Linear range (LR) and limit of detection (LOD) were obtained (19.3; 19.6), (5.0- 415 μg L-1; 2.7- 92 μg L-1) and (1.3 μg L-1;  0.6 μg L-1) with [CHCA] [DEA] and (13.7; 14.2), (7.5- 600 μg L-1; 3.6- 128 μg L-1) and (2.2 ng L-1; 0.9 μg L-1) with [HEMIM][BF4] for Ni and Cd ions in olive  samples respectively.

Comparison between Three Amperometric Sensors for Phenol Determination in Olive Oil Samples

1999 ◽  
Vol 32 (10) ◽  
pp. 1981-1990 ◽  
Author(s):  
Viviana Campo Dall'Orto ◽  
Claudia Danilowicz ◽  
Irene Rezzano ◽  
Michele Del Carlo ◽  
Marco Mascini
Keyword(s):  
Olive Oil ◽  
Amperometric Sensors ◽  
Phenol Determination

Amperometric Biosensor Based on Tyrosinase Immobilized on to a Carbon Black Paste Electrode for Phenol Determination in Olive Oil

2013 ◽  
Vol 46 (17) ◽  
pp. 2705-2726 ◽  
Author(s):  
Saloua Nadifiyine ◽  
Malika Haddam ◽  
Jihane Mandli ◽  
Sara Chadel ◽  
Carole Calas Blanchard ◽  
...  
Keyword(s):  
Carbon Black ◽  
Olive Oil ◽  
Amperometric Biosensor ◽  
Phenol Determination ◽  
Carbon Black Paste ◽  
Paste Electrode

scholarly journals Nanoengineering of eco-friendly silver nanoparticles using five different plant extracts and development of cost-effective phenol nanosensor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Siwar Jebril ◽  
Alaeddine Fdhila ◽  
Chérif Dridi
Keyword(s):  
Silver Nanoparticles ◽  
Water Samples ◽  
High Sensitivity ◽  
Cost Effective ◽  
Water Quality Monitoring ◽  
Melia Azedarach ◽  
Leaf Extracts ◽  
Highly Sensitive ◽  
Phenol Determination ◽  
Silver Nps

AbstractThe production of environmentally friendly silver nanoparticles (AgNPs) has aroused the interest of the scientific community due to their wide applications mainly in the field of environmental pollution detection and water quality monitoring. Here, for the first time, five plant leaf extracts were used for the synthesis of AgNPs such as Basil, Geranium, Eucalyptus, Melia, and Ruta by a simple and eco-friendly method. Stable AgNPs were obtained by adding a silver nitrate (AgNO3) solution with the leaves extract as reducers, stabilizers and cappers. Only, within ten minutes of reaction, the yellow mixture changed to brown due to the reduction of Ag+ ions to Ag atoms. The optical, structural, and morphology characteristics of synthesized AgNPs were determined using a full technique like UV–visible spectroscopy, FTIR spectrum, XRD, EDX spectroscopy, and the SEM. Thus, Melia azedarach was found to exhibit smaller nanoparticles (AgNPs-M), which would be interesting for electrochemical application. So, a highly sensitive electrochemical sensor based on AgNPs-M modified GCE for phenol determination in water samples was developed, indicating that the AgNPs-M displayed good electrocatalytic activity. The developed sensor showed good sensing performances: a high sensitivity, a low LOD of 0.42 µM and good stability with a lifetime of about one month, as well as a good selectivity towards BPA and CC (with a deviation less than 10%) especially for nanoplastics analysis in the water contained in plastics bottles. The obtained results are repeatable and reproducible with RSDs of 5.49% and 3.18% respectively. Besides, our developed sensor was successfully applied for the determination of phenol in tap and mineral water samples. The proposed new approach is highly recommended to develop a simple, cost effective, ecofriendly, and highly sensitive sensor for the electrochemical detection of phenol which can further broaden the applications of green silver NPs.

1H NMR, 1H–1H 2D TOCSY and GC-MS analyses for the identification of olive oil in Early Bronze Age pottery from Castelluccio (Noto, Italy)

2018 ◽  
Vol 10 (23) ◽  
pp. 2756-2763 ◽  
Author(s):  
Davide Tanasi ◽  
Enrico Greco ◽  
Radwan Ebna Noor ◽  
Stephanie Feola ◽  
Vasantha Kumar ◽  
...  
Keyword(s):  
Analytical Chemistry ◽  
Olive Oil ◽  
Bronze Age ◽  
1H Nmr ◽  
Early Bronze Age ◽  
Organic Residues ◽  
New Methods ◽  
Highly Sensitive ◽  
Analytical Research ◽  
Natural Decay

The development of analytical research in recent decades, at the edge between analytical chemistry and archaeology, provides new methods for the study of organic residues that are usually highly sensitive to natural decay.

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Fluorescence ratio imaging of dynamic intracellular ionic signals

1988 ◽  
Vol 46 ◽  
pp. 42-43
Author(s):  
R. Y. Tsien ◽  
A. Minta ◽  
M. Poenie ◽  
J.P.Y. Kao ◽  
A. Harootunian
Keyword(s):  
Binding Sites ◽  
Living Cells ◽  
Molecular Engineering ◽  
Ph Indicators ◽  
Highly Sensitive ◽  
Fluorescence Ratio Imaging ◽  
Ratio Imaging ◽  
Technical Advances ◽  
Indicator Dyes ◽  
Fluorescein Dyes

Recent technical advances now enable the continuous imaging of important ionic signals inside individual living cells with micron spatial resolution and subsecond time resolution. This methodology relies on the molecular engineering of indicator dyes whose fluorescence is strong and highly sensitive to ions such as Ca2+, H+, or Na+, or Mg2+. The Ca2+ indicators, exemplified by fura-2 and indo-1, derive their high affinity (Kd near 200 nM) and selectivity for Ca2+ to a versatile tetracarboxylate binding site3 modeled on and isosteric with the well known chelator EGTA. The most commonly used pH indicators are fluorescein dyes (such as BCECF) modified to adjust their pKa's and improve their retention inside cells. Na+ indicators are crown ethers with cavity sizes chosen to select Na+ over K+: Mg2+ indicators use tricarboxylate binding sites truncated from those of the Ca2+ chelators, resulting in a more compact arrangement of carboxylates to suit the smaller ion.

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