Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing.

The transformation of lignin with natural aromatic structure into value-added carbon dots (CDs) achieves a win-win situation for low-cost production of novel nanomaterials and reasonable disposal of biomass waste. However, it remains challenging to produce multi-emission CDs from biomass for advanced applications. Herein, a green and facile approach to preparing multi-emission CDs from alkali lignin via N and B co-doping is developed.

Microwave-assisted catalytic pyrolysis of moso bamboo for high syngas production.

Microwave-assisted pyrolysis of moso bamboo with the activated carbon-supported iron(III) ion catalyst was carried out with the aim of obtaining high quality and quantity syngas(H + CO). The effect of the catalyst on moso bomboo pyrolysis involving the temperature-rising characteristics, product distribution, tar conversion and gas compositions were investigated. The results indicated that the catalyst improved the microwave-absorption capability and increased the maximum reaction temperatures.

[Recent applications of graphene-based materials in capillary electrophoresis].

Graphene and graphene-based materials have been widely applied in biochemical and chemical analysis because of its unique physical and chemical properties. Recent applications of graphene-based materials in capillary electrophoresis (CE) were highlighted, such as modification of amperometric detection electrode, preparation of monolithic column, modification of capillary inner wall and modification of microchip. The potential application of graphene materials in CE is discussed in this review.

Cytokinins can act as suppressors of nitric oxide in Arabidopsis.

Maintaining nitric oxide (NO) homeostasis is essential for normal plant physiological processes. However, very little is known about the mechanisms of NO modulation in plants. Here, we report a unique mechanism for the catabolism of NO based on the reaction with the plant hormone cytokinin.

Classification of Maojian teas from different geographical origins by micellar electrokinetic chromatography and pattern recognition techniques.

A micellar electrokinetic chromatography (MEKC) method was applied for the identification of geographical origins of Chinese green teas. Under the optimized conditions, chromatographic profiling of collected Maojian tea samples was obtained. Based on MEKC-UV profiling, twenty-four tea samples were successfully differentiated according to the relative peak areas of selected peaks in the chromatograms.

[Determination of 16 polycyclic aromatic hydrocarbons in airborne particle samples using two-step thermal desorption and gas chromatography-mass spectrometry].

A method for the determination of 16 polycyclic aromatic hydrocarbons (PAHs) in airborne particle samples was developed using two-step thermal desorption and gas chromatography-mass spectrometry (GC-MS). The thermal desorption conditions and GC-MS parameters were optimized. The results showed that the detection limits (LODs) of this method varied from 0.

[Simultaneous determination of cocaine and its metabolite ecgonine methyl ester in human blood using microwave extraction-gas chromatography].

A method was developed for the simultaneous determination of cocaine (COC) and its metabolite ecgonine methyl ester (EME) in human blood using gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID). The blood sample was prepared by microwave extraction (MWE). The optimal parameters of MWE were as follows: 6 mL of chloroform-isopropanol (9: 1, v/v) mixture as extraction solvent, the pH value of the sample was adjusted at 10.

[Simultaneous determination of four beta-lactam antibiotics in milk by solid-phase extraction-micellar electrokinetic chromatography].

A solid-phase extraction (SPE)-micellar electrokinetic chromatography (MEKC) method was developed for the simultaneous determination of four beta-lactam antibiotics (ampicillin, amoxicillin, penicillin V and cephalexin) in spiked milk samples. The milk samples were extracted by SPE after protein precipitation. The analysis was performed by MEKC at 18 kV with phosphate buffer containing sodium dodecyl sulfate (SDS) and the detection was carried out at 210 nm.

A new simple and sensitive fluorometric method for the determination of hydroxyl radical and its application.

A simple and sensitive fluorometric method to detect the hydroxyl radical is described. This method employs the reaction between OH and dimethyl sulfoxide (DMSO) to generate quantitatively formaldehyde, which then reacts with ammonia and 1,3-cyclohexanedione (CHD) at pH 4.5.

[Determination of amphetamines in human urine using microwave extraction-gas chromatography].

A method has been developed for the determination of methamphetamine (MA), 3,4-methylenedioxyamphetamine (MDA) and 3,4-methylenedioxymethamphetamine (MDMA) in human urine using microwave extraction-gas chromatography(GC). To improve the extraction efficiency, experimental parameters of the extraction, including extraction solvent and its amount, pH value of the urine sample, extraction time and temperature were investigated. The optimal conditions were as follows: the pH value of urine sample at pH 12, cyclohexane as extraction solvent, extraction at 40 degrees C for 10 min.

[Determination of methamphetamine in human blood using microwave extraction-gas chromatography].

A method was developed for the determination of methamphetamine (MAM) in human blood using microwave extraction-gas chromatography (GC). To improve the extraction efficiency, experimental parameters on the extraction, including such as extraction solvent and its amount, pH value of blood sample, extraction time and temperature were investigated. Comparing with conventional liquid-liquid extraction method, the microwave extraction showed better efficiency under the optimal conditions.

Chiral separation of ephedrine isomers by capillary electrophoresis using bovine serum albumin as a buffer additive.

A method utilizing bovine serum albumin (BSA) as buffer additive for chiral separation by means of capillary electrophoresis is described. Parameters that affect chiral separation, such as buffer pH, buffer concentration, BSA concentration, and organic modifier, are investigated. Baseline resolution of ephedrine-pseudoephedrine and norephedrine-norpseudoephedrine isomers are achieved in an uncoated capillary with a 20 mmol/L phosphate buffer at pH 9.

[Determination of scopolamine and atropine in Flos Daturae by RP-HPLC].

Objective: To develop a quantitative analytical procedure of scopolamine and atropine in Flos Daturae using RP-HPLC.

Method: The two alkaloids were separated on a Hypersil BDS C18 column (4.6 mm x 250 mm, 5 microm) with a mobile phase of 0.

[Solid phase extraction and room temperature phosphorimetry coupling technique and its application].

The principle and application in the environmental analysis of Solid Phase Extraction (SPE) combined with Room Temperature Phosphorescence (RTP) analysis were reviewed. The principle, device, separation modes, operation procedures and application of SPE were commented. The merits and shortages in the operation procedure and quantitative analysis of classic RTP were also summarized.

A new simple and rapid electrochemical method for the determination of hydroxyl radical generated by Fenton reaction and its application.

A simple and rapid electrochemical method to detect the hydroxyl radical is described. This method employed the reaction between.OH and dimethyl sulfoxide (DMSO) to generate quantitatively formaldehyde, which then reacted with hydrazine hydrochloride at pH 6.