The vegetarian Maasai: Life in a culture based around meat

Meat is an essential part of daily life for Kenya's Maasai. But Anthony Mututua is a rare vegetarian.
Source: BBC News | Health | UK Edition - Category: Consumer Health News Source Type: news

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Abstract N-glycans are involved in a variety of biological processes and associated with many diseases. However, the sensitive and specific detection of glycans via mass spectrometry (MS) remains challenging due to their relatively low abundance and low ionization efficiency. In this work, a new method termed glycan reductive amino acid coded affinity tagging (GRACAT) is developed to address these problems. Through labeling the reducing ends of glycan with a biotinylated arginine, the ionization efficiency of glycan was increased nearly 50-fold and glycan isomers were discriminated by improved signals of fragments...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Abstract Novel molecularly imprinted polymer (MIP) for metformin was synthesized on the surface of magnetic multi-walled carbon nanotubes (MMWCNTs) as the support. Metformin was used as the template, methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker and 2,2'-azoisobutyronitrile (AIBN) as the initiator. The synthesized composite was characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and Fourier transform infrared spectroscopy (FTIR). The surface molecularly imprinted composite ...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Abstract The dehydration reaction of tetraamino porphyrin and 4,4'-biphenyldicarboxaldehyde was performed for the synthesis of a novel covalent organic framework (COF), which was decorated on magnetic Fe3O4 to obtain core-shell structured Fe3O4@COFs nanospheres for the first time, for effective extraction and enrichment of sulfonamides (SAs). The morphology and structure of the synthesized nanospheres were characterized through various methods. The extraction conditions for six SAs including sulfadiazine, sulfamerazine, sulfamethazine, sulfamonomethoxine, sulfamethoxazole, sulfadimethoxine were systematically opti...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
n TG, Reubsaet L Abstract A novel all-in-one paper-based sampling concept for mass spectrometric bottom-up protein analysis is here demonstrated in a chip format integrating instant immunocapture, protein reduction, - alkylation and tryptic digestion all in-device. Conventional laboratory grade filter paper was coated with the polymer 2-hydroxyethyl methacrylate-co-2-vinyl-4,4-dimethyl azlactone (pHEMA-VDM) with a subsequent covalent immobilization of the monoclonal antibody E27 targeting the biomarker human chorionic gonadotropin (hCG). In-device protein reduction and alkylation was optimized with regards to reag...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Dual-signal sandwich electrochemical immunosensor for amyloid β-protein detection based on Cu-Al2O3-g-C3N4-Pd and UiO-66@PANI-MB. Anal Chim Acta. 2019 Dec 16;1089:48-55 Authors: Miao J, Li X, Li Y, Dong X, Zhao G, Fang J, Wei Q, Cao W Abstract Combining of amperometric and square wave voltammetric methods (SWV), the dual-signal sandwich electrochemical immunosensor was developed for quantitative determination of amyloid β-protein (Aβ). Cu was doped into Al2O3 lattice (Cu-Al2O3) and reacts with graphite carbon nitride (g-C3N4) to generate Cu-Al2O3-g-C3N4 with internal dual-reaction cente...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
We present here: 1- an improved analytical method for chromium speciation (Cr(VI) vs Cr(III)) in estuarine samples by catalytic adsorptive cathodic stripping voltammetric (cat-AdCSV) and 2- a study highlighting a significant change of redox speciation during summer and winter. Initial measurements first revealed that surface-active substances (SAS) present in estuarine samples strongly influenced the analytical determination of Cr by partially masking the Cr peak through an increase of the background current. We found that the application of a low negative accumulation potential (-1.65 V) resulted in much better voltammo...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Electrochemical biosensors for the detection and study of α-synuclein related to Parkinson's disease - A review. Anal Chim Acta. 2019 Dec 16;1089:32-39 Authors: Hassan Q, Li S, Ferrag C, Kerman K Abstract Parkinson's disease (PD) is a long-term degenerative disorder that affects predominately dopaminergic neurons in the substantia nigra, which mainly control movement. Alpha-synuclein (α-syn) is a major constituent of Lewy bodies that are reported to be the most important toxic species in the brain of PD patients. In this critical review, we highlight novel electrochemical biosensors that h...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Abstract Material science requires advanced analytical methods which allow size-fractionated and chemical quantification of powdered nanomaterials. Nanopowders can be introduced to a helium plasma by pneumatic nebulization based on fluidized bed approach and measure with a time resolution of 4-20 ms. This new analytical technique is accessible by an microwave plasma optical emission spectrometry (MWP-OES) operated in single-particle mode, providing information about their elemental composition, size, dispersity and agglomeration of nanoparticles (NPs). Next, NPs can be characterized by the corresponding element-...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
In this study, we report the first independent measurements of all tungsten isotope ratios in five commercial tungsten reagents, including the new NRC candidate isotopic reference material WOLF-1 by MC-ICP-MS with use of the-state-of-the-art optimized regression mass bias correction model and NIST SRM 989 isotopic rhenium as calibrator. PMID: 31627814 [PubMed - in process]
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
Abstract NiFe2O4 was synthesized using sol-gel method for sensing electrode material of YSZ based ammonia sensor. NiFe2O4-SEs sintered at 1100 °C, 1150 °C and 1200 °C were characterized by XRD, the BET method and ESEM. By testing the NH3 response of different sensors at 650 °C, it was observed that the 1150 °C sintered sensor had the largest response value (-104.3 mV for 320 ppm NH3) and the highest sensitivity (-77.56 mV/decade), which were related to the most TPB sites and the moderate gas phase catalytic reaction. The response values of the sensor varied almost linearly with th...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
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