Progress in Synthesis，Detection and Clinical Application of Posaconazole北大核心CSCD

Posaconazole,as the second generation of triazole antifungal drugs,has a wide antifungal spectrum and strong antibacterial activity. It is widely used in clinical practice. However,it has been eight years since its publication before it is approved in China. In order to better understand posaconazole,a first-line drug with great clinical demand, this paper summarizes the pharmacokinetics, pharmacological properties,clinical application and synthetic route of posaconazole in the literature at home and abroad. It is hoped that it can fill the gap in the domestic API market,break the current situation that the API is completely dependent on import,and provide a useful reference for the industrial R & D. © 2022, Science Press (China). All rights reserved.     

Detection of dimetridazole in pork by thin-layer chromatography and surface-enhanced Raman scattering spectroscopyEI北大核心CSCD

The thin-layer chromatography coupled with surface-enhanced Raman scattering spectroscopyTLC-SERSwas used to detect dimetridazole in pork. The diatomite was used as stationary phase to construct TLC plate. The mixture containing dimetridazole was directly spotted on the diatomite plate to realize TLC separation without complicated pre-treatment process. The ratio shift valueRf was determined after TLC separation. Au nanoparticles were dropped onto the corresponding position for SERS measurement. The sensitivity of dimetridazole could reach 10 μµmol/L and the detection limit was 4.16 mmol/Lwhich was lower than the maximum residue limit of dimetridazole in food. © 2022, Youke Publishing Co.,Ltd. All rights reserved.     

Detection of arsenic and lead in chromite by alkali fusion-acid dissolvingatomic fluorescence spectrometryEI北大核心CSCD

A hydride generation-atomic fluorescence spectrometry （AFS） method was developed for the detection of arsenic （As） and lead （Pb） in chromite by alkali fusing and acid dissolving. The sample was fused by Na2O2 and acidification dissolved by HCl. As was quantified by AFS with 10% （V/V） HCl as the carrier flow agent, and KBH4（15 g/L） as reducing agent. Pb was quantified by AFS with 1% （V/V） HCl as the carrier flow agent, and KBH4（20 g/L）-KOH（10 g/L）-K3［Fe（CN）6］ （15 g/L） as reducing agent. Under the optimum conditions, the correlation coefficient （R2） was 1.0000 in the range of 0.5-10 μg/L, the limit of detection （LOD） was 0.05 μg/g with the relative standard deviations （RSDs） of 1.4%-6.0% and the recoveries of 96.2%-116.7% for As. And the R2 was 0.9998 in the range of 1.25-25 μg/L, the LOD was 0.2 μg/g with the RSDs of 1.5%-3.7% and the recoveries of 95.9%-112.2% for Pb. In addition, the method was validated by certified reference sample analysis and multi-laboratory test, which meets the requirements for the standardized quantitative analysis of trace As and Pb in chromite. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Determination of uracil in the culture fluid of Glomerella cingulata and infected hosts by high-performance liquid chromatographyEI北大核心CSCD

A CRISPR-Cas system holds great promise as a next-generation biosensing technology for molecular diagnostics. In this paper, a portable biosensor based on the trans-cleavage activity of CRISPR-Cas12a and a personal glucose meter has been developed for quantitative, sensitive and specific detection of melamine. The presence of the target melamine binds to the aptamer, leading to the release of locker DNA. And then, the leasing locker DNA activates the trans-cleavage activity of CRISPR-Cas12a to cleave the single-strand DNA (ssDNA) linker on sucrase-ssDNA modified electrode, releasing a short DNA fragment labeled with sucrase in the resulting solution. The sucrase could further catalyze sucrose to glucose, which could be detected by the PGM. Under the optimized conditions, the increase of PGM signal was relative with the concentration of melamine ranging from 0.1 to 2.5 μmol/L and the limit of detection (LOD) was 37 nmol/L. Moreover, the portable biosensor has strong specificity and can be used for the quantitative detection of melamine in milk samples. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Determination of the migration of 8 benzophenones in food contact materials and products by HPLC-MS / MSEI北大核心CSCD

建立了高效液相色谱-串联质谱法测定食品接触材料及制品中8种二苯甲酮类物质迁移量的方法。样品经过食品模拟物浸泡后,水、4%乙酸、10%乙醇、20%乙醇、50%乙醇模拟物直接进样,95%乙醇模拟物用水按照1:4比例稀释后进样,橄榄油和异辛烷模拟物用甲醇-水混合溶液萃取后进样。采用C₁₈柱分离,用甲醇-0.1%甲酸水溶液为流动相梯度洗脱,质谱采用正离子多反应监测（MRM）模式运行。本方法在8种食品模拟物中的定量限为0.01～0.20 mg/kg;在0.04～0.80 mg/kg, 0.2～2.0 mg/kg, 0.6～3.0 mg/kg线性范围内相关系数良好（R≥0.9958）;加标实验结果显示相对标准偏差（RSD）为0.61%～7.8%。该方法可用于食品接触材料及制品中二苯甲酮类物质迁移量的测定。     

Determination of mannose in honey by isotope dilution gas chromatography mass spectrometryEI北大核心CSCD

建立了一种同位素稀释-气相色谱/质谱(GC-MS)测定蜂蜜中甘露糖含量的方法。选择了一种新型化合物[13C;D]-D-甘露糖作为蜂蜜中甘露糖检测的同位素内标,优化了甘露糖及其内标的气相色谱分离条件和质谱参数。蜂蜜样品经70%乙醇水溶液溶解后加入同位素内标,采用两步衍生法对蜂蜜中糖组分进行衍生化,即先加入2.5%盐酸羟胺-吡啶溶液进行肟化衍生,再加入N,O-双(三甲基硅基)三氟乙酰胺(BSTFA)进行硅烷化衍生,采用GC-MS对甘露糖进行定性分析和定量检测。结果表明,以洋槐蜜、油菜蜜、荆条蜜和椴树蜜为代表性样品基质,甘露糖的检出限均为6 mg/kg,定量限为20 mg/kg,在20,40,200 mg/kg 3个添加水平下方法的平均回收率在66.1%~91.7%之间,相对标准偏差不超过20%。该方法适用于不同类型蜂蜜中甘露糖含量的测定。     

Determination of lanthanum and cerium in cmsx-4 nickel-based superalloys by inductively coupled plasma mass spectrometryEI北大核心CSCD

CMSX-4 is the second-generation nickel-based single crystal superalloy used widely in the world. The oxidation resistance and corrosion resistance of CMSX-4 alloy can be improved by adding trace lanthanum (La), cerium (Ce) and other rare earth elements. A method for the simultaneous determination of La and Ce in CMSX-4 nickel-based superalloy by wet dissolution-inductively coupled plasma mass spectrometry was established. The sample was heated and dissolved under normal pressure by aqua regia and hydrofluoric acid, and the interference of fluorine ion was eliminated by using perchloric acid. The amount of dissolved acid and the digestion conditions were optimized. The limits of detection were 0.23 μg/g for La and 0.85 μg/g for Ce under optimized conditions. The spiked recoveries were 95.0%–98.9% with the relative standard deviations of 1.3%–3.9%, which can meet the requirements of accurate and rapid determination of La and Ce in CMSX-4 nickel-based superalloy. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Preparation and application of novel polymer nanoparticles in the detection of copper ion and cysteineEI北大核心CSCD

A novel amphiphilic copolymer,dipropenoxystyrene anthracene and acrylic acid copolymer（BASA-AA） was designed and synthesized based on divinyl anthracene. The polymer self-assembled rapidly in water to create polymer nanoparticles（BASA-AA NPs）with a uniform size of 45 nm,no dye leakage,and great brightness（Φ= 36%）. Because of the enormous number of carboxyl groups on the surface of the particles,it can disperse extremely well in water,and can be used for the rapid detection of copper ion and cysteine（Cys）in pure water, with the limit of detection of 45 nmol/L. The fluorescent intensity of the nanoparticles will be greatly reduced after the introduction of copper ion,realizing the detection of copper ion with high selectivity and sensitivity. A composite probe made of BASA-AA NPs and copper ion can detect Cys in the range of 0.1-10 µμmol/L,with the detection limit of 84 nmol/L,due to the high binding capacity of the sulfhydryl group and copper ion. The method is simple and rapid in material synthesis and preparation,and shows high selectivity and sensitivity in pure water. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Determination of Pb（II） in environmental water by nano-ceria-graphene modified electrodeEI北大核心CSCD

Nafion solution as a binder,the Gr/CeO2 /Nafion/GCE modified electrode was prepared based on graphene （Gr）-nano cerium oxide （CeO2 ）composite materials. The electrochemical behavior of Pb（II）on the modified electrode was investigated using differential pulse anodic stripping voltammetry （DPASV）. Subsequently,a determination method for Pb（II）was established. The concentrations and ratio of composite materials,buffer solution pH,modification amount,enrichment potential and time were optimized. Under the optimal conditions ,the peak current of Gr/CeO2 /Nafion/GCE showed good linearity in the range of 0.24-48.31 μµmol/L of Pb（II）,and the detection limit was 4.3 nmol/L. Interference experiments showed that the other common anions and cations in water samples caused little interference to Pb（II）detection. Furthermore,the interference of Cu（II）within 10 times is acceptable. The modified electrode was used to the detection of Pb（II） in four complex water samples,and the recovery rates of the spiked assays were from 89.5% to 107.7%. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Determination of digoxin and its metabolites in biological samples by solidphase supported liquid-liquid extraction-liquid chromatography-tandem mass spectrometryEI北大核心CSCD

采用固相支撑液液萃取-超高效液相色谱-串联质谱（SLE-UPLC-MS/MS）技术建立了生物样本血液、尿液和肝组织中地高辛（DG）及其3种代谢物的分析方法。生物样本经匀浆、蛋白沉淀后,通过含有硅藻土的固相支撑液液萃取（SLE）柱净化富集,经洗脱、定容后进行LC-MS/MS分析。结果表明,血液基质中,地高辛在0.1～100 ng/mL浓度范围内线性关系良好;肝脏和尿液基质中,地高辛在0.2～100 ng/mL浓度范围内线性关系良好,地高辛的3种代谢物在0.5～100 ng/mL浓度范围内线性关系良好,3个浓度水平（10, 50和100 ng/mL）的加标回收率为60.5%～95.6%,基质效应80.7%～113.6%,日内、日间相对标准偏差（RSD）均小于13%,检出限为0.1～0.5 ng/mL。所建立的方法可用于生物样本中地高辛及其代谢物的定性定量分析。     

Recent advancements in analytical methods of phosphodiesterase 5 inhibitors and their metabolitesEI北大核心CSCD

磷酸二酯酶5抑制剂(PDE5i)用于治疗勃起功能障碍和肺动脉高压等疾病。因PDE5i类药物种类繁多,理化性质各异,在体内代谢迅速且具有多种代谢途径,故生物样本检验难度大。本文介绍了PDE5i类药物及其代谢物,总结了生物样本中该类物质的沉淀蛋白法、液-液萃取法、固相萃取法和固相微萃取法等前处理方法,综述了高效液相色谱法、液相色谱质谱联用法、荧光光谱法和电化学分析法等检测方法,展望了PDE5i及其代谢物分析的未来发展方向,以期为PDE5i的药物监测和法庭科学毒物检验提供参考。     

Determination of the impurity of isopentylamine hydrochloride in the intermediate of bortezomib by HPLC with pre-column derivatizationEI北大核心CSCD

A method was developed for the simultaneous determination of （R）-pinacol-1-amino-3-methylbutylborate hydrochloride and isopentylamine hydrochloride by pre-column derivatization high performance liquid chromatography （HPLC） with dichloromethane as solvent,triethylamine as acid binding agent and benzoyl chloride as derivative reagent. （R）-pinacol-1-amino-3-methylbutylborate hydrochloride and isopentylamine hydrochloride reacted with derivatization reagent in an ice bath for 10 min. The derivatives were qualitatively determined by HPLC-mass spectrometry（HPLC-MS）. HPLC was performed on an AgelaVenusil MP C18 （2）column using methanol-water （70∶30,V/V）as mobile phase. The flow rate was 1.0 mL/min,the detection wavelength was 236 nm and the column temperature was 35℃ . The UV absorption produced after derivatization,which could be detected by HPLC with good specificity. Isopentylamine hydrochloride derivative showed an excellent linearity in the range of 0.075-30 μµg/mL,with the limit of quantification and the limit of detection（LOD）of 0.075 and 0.030 μµg/mL,respectively. And the S/N of the LOQ and the LOD were 44.6 and 7.8,respectively. The average recoveries were 97.7%-104.0% with the RSD of 2.9%. The method is suitable for the determination of isoamylamine hydrochloride and has significant reference value for the determination of other amine salt without UV absorption. © 2022, Youke Publishing Co.,Ltd. All rights reserved.     

Effects of trichlorfon on the contents of acetylcholine and choline in fish brain microdialysis samples by UPLC-MS/MS methodEI北大核心CSCD

A combination of microdialysis sampling with ultra-high performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）was used to quantitatively analyze the effects of organophosphorus pesticides trichlorfon on acetylcholine （ACh） and choline （Ch） in the brain of crucian carp. The mechanism of organophosphorus pesticides poisoning was preliminarily discussed,showing that the ACh content in the brain of fish increased significantly with the increase of the exposure time to trichlorfon,while the Ch content decreased. It indicated that organophosphorus pesticides inhibited the activity of cholinesterase in organisms. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Determination of hydroxypropyl bis (N-hydroxyethyl-p-phenylenediamine) hydrochloride in hair dye products by HPLC and its verification by LC-MS/MSEI北大核心CSCD

A method for the determination of hydroxypropyl bis (N-hydroxyethyl-p-phenylenediamine)hydrochloride in hair dye products by high performance liquid chromatography (HPLC) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed. The sample was ultrasonically extracted with 50% (V/V) ethanol. Chromatographic separation was carried out on a Waters Symmetry C18 column (250 mm×4.6 mm, 5 µm) by isocratic elution. The mobile phase was 0.02 mol/L ammonium acetate aqueous solution and acetonitrile (84∶16, V/V). The detection wavelength was 258 nm. Quantification was performed by external standard method. Verification for positive samples was performed by LC-MS/MS. The results showed good linearity from 2 mg/L to 200 mg/L, with the correlation coefficients (r) higher than 0.999. The limit of detection (LOD) was 0.003%(w/w), and the limit of quantification (LOQ) was 0.01%(w/w). The average spiked recoveries at three levels in both cream and liquid substrates were from 97.5% to 103.4%, with the relative standard deviations (RSDs) from 1.7% to 3.9%. The method could be used to detect hydroxypropyl bis (N[1]hydroxyethyl-p-phenylenediamine)hydrochloride in hair dye products, which could fill the gap of the current standard. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives北大核心CSCD

Aiming to tackle the serious brittleness problem of polylactic acid（PLA）,PLA-based multiphase blends are prepared by melting reactive blending with hydroxyl functionalized ionomer as the toughening agent and compatibilizer containing epoxy groups. The structures and properties of the blends are characterized by scanning electron microscopy（SEM）,Fourier transform infrared spectrometer（FT-IR）,differential scanning calorimetry（DSC）and mechanical properties tests. The synergistic compatibilization and toughening effects of epoxy soybean oil （ESO）,polyethylene glycol diglycidyl ether （PEGDE）and ethylene-methyl acrylate-glycidyl methacrylate （AX8900） terpolymer are compared and analyzed. The results show that the compatibilization effect is closely related to the content and position of the epoxy group in the additives,which presenting different toughening effects. The addition of AX8900 can effectively improve the toughness of the blend system to obtain balanced mechanical properties. However,ESO tends to lead to crosslinking,which limits the toughening efficiency. PEGDE mainly shows a plasticizing effect,leading to the reduction of tensile strength. The results demonstrate modification of the PLA blends by reactive blending with different epoxy additives and hydroxy-containing polymers is an effective strategy for the development of high-performance biobased PLA materials. © 2022, Science Press (China). All rights reserved.     

Determination of multiple phenolic compounds in infant textile products by derivatization gas chromatography-mass spectrometryEI北大核心CSCD

A method for the simultaneous determination of 17 phenolic compounds in infant textile products, including phenol,o-phenylphenol,alkylphenols and bisphenols,was established using gas chromatography-mass spectrometry（GC-MS）. The samples were extracted by 0.1 mol/L KOH solution,derived with acetic anhydride. The derivatives were extracted with ethyl acetate,separated by HP-5MS column,and determined by gas chromatography-mass spectrometry with ion mode scanning. Under the optimized conditions,the method had a good linear relationship in the range of 0.5-6.25 mg/L（R2>0.9990）,the recoveries ranged from 80% to 110%, the relative standard deviations were 1.0%-8.6%,and the limit of quantification was 1.0 mg/kg. The method can achieve the simultaneous detection of 17 phenolic compounds in infant textile products. © 2023, Youke Publishing Co., Ltd. All rights reserved.     

Determination of 15 polycyclic aromatic hydrocarbons in lotus root by QuEChERS-high performance liquid chromatographyEI北大核心CSCD

A method for the determination of 15 priority polycyclic aromatic hydrocarbonsPAHsin lotus root by QuEChERS technique combined with high performance liquid chromatography HPLC was established. Lotus root samples were extracted by acetonitrilefiltrated after salting out and purified by C18 and primary secondary aminePSAsorbent. Then the 15 kinds of PAHs were analyzed by HPLC with diode array detector or fluorescence detector after being separated by Athena PAHs column. When the 15 kinds of PAHs were analyzed by diode array detectorthe linear relationships were good between 0.02 and 1.0 mg/L with the correlation coefficients above 0.99 for all the 15 kinds of PAHs. The limits of quantitation were 0.02 mg/kg for allthe average recoveries of the 15 kinds of PAHs were 84.7%-117.1%and the relative standard deviations were 0.73%-11%. When the 14 kinds of PAHsexcept for acenaphthyleneanalyzed by fluorescence detectorthe linear relationships were good between 0.001 and 1.0 mg/L with the correlation coefficients above 0.99 for all the 14 kinds of PAHs except for acenaphthylene. The limits of quantitation were 5 μµg/kg for allthe average recoveries of the 14 kinds of PAHsexcept for acenaphthylenewere 69.1%-111.8%and the relative standard deviations were 0.18%-9.7%. Diode array detector and fluorescence detector are complementary. Diode array detector can analyze all the PAHsbut its sensitivity is relatively low. Fluorescence detector is not suitable for acenaphthylene with weak fluorescence signalbut its sensitivity is much higher than that of diode array detector. This method is suitable for simultaneously and quickly determination of 15 kinds of PAHs in lotus root. © 2022, Youke Publishing Co.,Ltd. All rights reserved.     

Study on the interference elimination of trace cadmium in superalloy by ICP-MS / MSEI北大核心CSCD

A triple quadrupole inductively coupled plasma mass spectrometry (ICP-MS / MS) method was developed for the determination of trace Cd in superalloys. Meanwhile, the interference elimination effects of different collision / reaction gases (He, O2 and NH3) in single quadrupole mode (SQ) and double quadrupole mode (QQQ) were investigated. The results indicated that the modes of QQQ-O2 and QQQ-NH3 possessed satisfactory interference elimination effect than the others. The optimal flow rates of O2 and NH3 were 0. 75 mL / min and 0. 50 mL / min, respectively. In order to verify the interference elimination effect, the recovery rate of 0. 1 μg / g Cd in 0. 10 mg / g to 100 mg / g Mo content solutions, as well as the determination results of superalloy standard substance and the actual sample were investigated. The measured value was within the range of the standard value, and the measured value of the actual sample was consistent with that of the hydride generation atomic fluorescence method. Therefore, the proposed method can eliminate the polyatomic ions interference of Mo on trace Cd. © 2022, Youke Publishing Co.,Ltd. All rights reserved.     

Synthesis of Ruthenium-Graphene Quantum Dots Artificial Oxidase and Its Application in Colorimetric Detection of Phoxim in Carrots北大核心CSCD

The histidine functionalized graphene quantum dots（His-GQDs）react with ruthenium trichloride to form a stable ruthenium complex. This complex is treated in a N2 atmosphere at 600 ℃ for 1 h to obtain a ruthenium-graphene quantum dot composite （Ru-His-GQD）. The results of scanning electron microscopy （SEM）and transmission electron microscopy（TEM）analysis demonstrate that Ru-His-GOD has one three-dimensional structure. The diameter of ruthenium nanoparticles is between 40 and 60 nm. Ru-His-GQD is rich in functional groups and has high oxidase-like activity. Based on Ru-His-GQD catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine（TMB）to produce blue compounds,a photometric method for the determination of phoxim in carrots is established. Phoxim can inhibit the activity of Ru-His-GQD oxidase,resulting in a decrease in the absorbance of the blue compound. When the concentration of phoxim is between 30～240 μg/ L,the absorbance of the oxidation product of TMB at 652 nm decreases linearly with the increase of phoxim concentration. The detection limit of the method reaches 7. 33 μg/L（S/N=3）,and the sensitivity is higher than those in literature. It has been successfully applied to the detection of phoxim in carrots. © 2022, Science Press (China). All rights reserved.     

Preparation of Formyl Deoxycholic Acid Modified Fe3O4 Nanoparticles and Their Application for Oxytetracycline Loading北大核心CSCD

Formyldeoxycholic acid modified Fe3O4 nanoparticles（FDCA-MNPs）have been successfully constructed. The structure,morphology and magnetic properties of FDCA-MNPs are characterized by Fourier transform infrared spectroscopy（FT-IR）,transmission electron microscopy（TEM）and vibrating sample magnetometer. Oxytetracycline（OTC）is used as a model drug to evaluate the drug loading and release behaviors of FDCA-MNPs. The maximum loading of OTC is 59. 7 mg/g,and the loading behavior follows Freundlich adsorption balance equations with multilayer adsorption．Furthermore,FDCA-MNPs@OTC shows a higher release rate at pH=9 （11. 8%）than that of pH=7（8. 8%）. The bacteriostatic activities of FDCA-MNPs,OTC,FDCA-MNPs@OTC against E. coli are compared in vitro. The results show that FDCA-MNPs have no inhibition-activity for E. coli, meanwhile,FDCA-MNPs@OTC displays better sterilization ability than OTC at the same concentration. The minimum antibacterial concentration is 3 μg/mL,and the antibacterial rate reaches 97. 8%. It is proved that the synergistic effect of drug carrier and drugs reveals good antibacterial properties and reduce the dosage of antibiotics. © 2022, Science Press (China). All rights reserved.