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Simultaneous Determination of 12 Components in Longqing Capsule by QAMS

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Medicinal Plant 2025年第1期16卷 11-15,69页

作者： Yifei LIN Yamin ZUO Tianjun LUO Jie LU Baohu ZHANG Yan CHEN Qing WU Qin CHEN Key Laboratory of Mountain Environmental Information System and Ecological Environmental Protection Guizhou Normal UniversityGuiyang 550001China Hubei Key Laboratory of Wudang Local Traditional Chinese Medicine Research School of Basic Medical SciencesHubei Medical UniversityHubei 442000China guizhou Remote Pharmaceutical Co. LtdGuiyang 550001China guizhou Cooperative Innovation Center of Biology and Information Technology in Karst Region Guiyang 550001China The Third Experimental Middle School of Guiyang City Guiyang 550001China College of Foreign Languages Guizhou Normal UniversityGuiyang 550001China

[Objectives]To establish a multi-indicator quality control method for the retention of Longqing Capsule based on the principle of prescription of Chinese medicine.[Methods]High performance liquid chromatography(HPLC)with ShimNex CS C 18 as the column;column temperature:35℃;wavelength:270 nm;methanol-0.1%phosphoric acid solution as the mobile phase with gradient elution.[Results]The 12 components of the retention of Longqing Capsule showed good linearity within the investigated range(r≥0.9995),with the average spiked recoveries of 97.83%-100.52%and the RSD of 0.9%-2.1%.[Conclusions]The method is exclusive,sensitive,reproducible,simple and easy to use,and can provide a reference for the construction of the quality standard and control system of Longqing Capsule based on the theory of traditional Chinese medicine.

关键词： Longqing Capsule Chemical component Content determination Quantitative analysis of multi-components by single marker(QAMS)

Endophytic Fungi Mediate Plant Growth and Promote the Accumulation of Secondary Metabolites

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Plant Diseases and Pests 2025年第1期16卷 24-30,33页

作者： Shuping WU Shunxing YANG Shiqiong LUO Wenxuan QUAN Zhannan YANG Tianhua YU Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment of guizhou Province Guizhou Normal UniversityGuiyang 550001China School of Life Sciences Guizhou Normal UniversityGuiyang 550001China

[Objectives]To investigate the mechanism of endophytic fungi mediating the plant growth and promoting the accumulation of secondary metabolites in Camellia oleifera.[Methods]Four strains of endophytic fungi isolated from the rhizomes of *** were co-cultured with *** seedlings individually in sterile soil for 49 d:Didymella sp.(DS),Fusarium sp.(FS),Penicillium sp.(PS),and Clonostachys rosea(CR).[Results]The biological activities of the four fungal strains differed,but all exhibited the ability to promote quercetin accumulation while simultaneously reducing quercetin glycosides after co-culture with *** *** DS,FS and PS treatments resulted in a significant increase in the leaf area of ***,with all of the experimental groups exhibiting a weight increase of over 50%compared to the control(CON)group.[Conclusions]Our findings demonstrate the potential utility of endophytic fungi in the production of ***,highlighting their capacity to enhance both productivity and the accumulation of plant metabolites.

关键词： Camellia oleifera Endophytic fungi Secondary metabolite

Preparation and properties of bifunctional Gd_(2)O_(3)/GQD composite nanoparticles

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Journal of Rare Earths 2022年第7期40卷 1118-1125页

作者： Chengjie Xu Meigui Ou Hao Zhou Chunlin Yang College of Materials and Metallurgy University of GuizhouGuiyang 550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang 550025China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang 550003China

Nanocomposites of graphene quantum dots(GQDs)modified gadolinium oxide(Gd_(2)O_(3))particles were successfully *** addition,the effects of the amount of GQDs and the particle size of Gd_(2)O_(3)on the properties of nanocomposites were *** structures and properties of nanoparticles were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,Fourier transform infrared spectroscopy,field emission scanning electron microscopy,transmission electron microscopy,photoluminescence spectrometry,and magnetic resonance *** results show that the synthesized particles Gd_(2)O_(3)/GQD are spherical with a diameter of approximately 40 nm and have excellent fluorescence and magnetic property,and its relaxation rate(r_(1)=25.18(mmol/L)^(-1)/s)is higher than that of the typical commercial contrast agents Gd-DTPA(r_(1)=4.5(mmol/L)^(-1)/s),The fluorescence property of Gd_(2)O_(3)/GQD is optimized by varying the V_(GQDs):V_(Gd2O3)ratio,and 1:1 ratio of V_(GQDs):V_(Gd2O3)results in the best fluorescence *** large particles of Gd_(2)O_(3)improve the relaxation property of ***,the nanocomposites Gd_(2)O_(3)/GQD with magnetic and fluorescence characteristics can be used in biological imaging,drug targeting,and in-vivo diagnostic analysis.

关键词： Gd_(2)O_(3)/GQD Magnetic Fluorescence Magnetic resonance imaging(MRI) Rare earths

Luminescence properties and optical sensing behaviors of Sr_(2)GdSbO_(6):Eu^(3+) phosphors

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Journal of Rare Earths 2024年第8期42卷 1458-1469,I0002页

作者： Youfa Tai Ruirui Cui Jun Zhang Chunkai Wang Tingyu Zhao Beiqiao Zhang Chaoyong Deng Key Laboratory of Functional Composite Materials of guizhou Province College of Big Data and Information EngineeringGuizhou UniversityGuiyang550025China College of Computer and Information Engineering Guizhou University of CommerceGuiyang550014China School of Electronics and Information Engineering Guiyang UniversityGuiyang550005China

Novel orange-red Sr_(2)GdSbO_(6):xEu^(3+)(x=0,0.05,0.1,0.2,0.3,0.4,0.5 and 0.6) phospho rs were successfully prepared by the traditional high-temperature solid-state *** results of Rietveld refinement,energy dispersive spectroscopy(EDS) spectrum and elemental mapping demonstrate that Eu^(3+) successfully replaces the Gd^(3+) sites and distributes uniformly in the particles of *** luminescence properties of Sr_(2)GdSbO_(6):Eu_(3+)phosphors were investigated in *** emission spectra of the strongest emission peak is the ^(5)D_(0)→^(7)F_(1)(593 nm) transition,which can emit orange-red light under393 nm *** the doping concentration of Eu3+ions is x=0.2,the luminescence intensity of the phosphors reaches the *** detailed mechanism of concentration quenching is attributed to dipole-dipole *** thermal stability values of Sr_(2)GdSbO_(6):0.2Eu^(3+) phosphors are 87%,82% and114% under 393,467 and 527 nm excitations,*** causes of the abnormal thermal quenching under 527 nm excitation were *** on the abnormal thermal quenching under527 nm excitation,the optical thermometry properties of Sr_(2)GdSbO_(6):0.2Eu^(3+)phosphors were investigated by fluorescence intensity ratio(FIR) technique,and appreciable relative sensitivity was *** results suggest that Sr_(2)GdSbO_(6):0.2Eu^(3+)phosphors can be potentially applied to w-LEDs and optical thermometers.

关键词： Sr_(2)GdSbO_(6):Eu^(3+) Phosphors Luminescence properties Abnormal thermal quenching Rare earths

Luminescence property and magnetic resonance imaging of Gd_(2)O_(3):Tb^(3+) nanocrystals doped with Zn^(2+),Li^(+)

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Rare Metals 2021年第8期40卷 2049-2058页

作者： Rong Fu Yan-Yan Hu Hui-Na Qiao Chun-Lin Yang Hao Yin Mei-Gui Ou College of Materials and Metallurgy University of GuizhouGuiyang550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang550025China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang550003China department of Neurosurgery Guizhou Provincial People’s HospitalGuiyang550002China

Gd_(2)O_(3):Tb^(3+) nanocrystal co-doped with Zn^(2+)and Li^(+) was prepared by the combination of polyol and solid-phase *** synthesized nanoparticles were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),photoluminescence(PL)spectra and magnetic resonance imaging(MRI).The results revealed that both Gd_(2)O_(3):Tb^(3+)/Zn^(2+) and Gd_(2)O_(3):Tb^(3+)/Li^(+) had cubic unit structures with a spherical shape,and the fluorescence intensity of the nanoparticles reached a maximum at a doping concentration of0.050 mmol%for Zn^(2+) and 2 mol%for Li^(+),*** addition,the T_(1)/T_(2)(longitudinal/transverse relaxation time)-weighted MRI signals got enhanced due to the increased longitudinal relaxivity(r1)and transverse relaxivity(r2)after the doping by metal ***,the materials reported here can be used for fluorescence and MR bimodal imaging,as tracers and for fluorescence detections.

关键词： Gd_(2)O_(3):Tb^(3+) Zn^(2+)/Li^(+)doping Luminescent property Magnetic resonance imaging Nanomaterials

Advances in adsorption of Pb(Ⅱ) by MOFs-based nanocomposites in water

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Progress in Natural Science:Materials International 2024年第1期34卷 122-146页

作者： Yuanhang Lei Jiangqin Xie Wenxuan Quan Qi Chen Anping Wang School of Materials and Architectural Engineering Guizhou Normal University Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of guizhou Province Guizhou Normal University

Currently, the escalation of water pollution due to heavy metals has reached a critical point, posing a significant threat to human existence. Lead and its compounds, among these metals, exhibit notable stability, making them resistant to metabolic breakdown and degradation. However, the persistence of lead in water can endanger human well-being by infiltrating the food chain, leading to various ailments, including cancer. The adsorption approach has gained considerable prominence in the realm of heavy metal treatment methodologies, owing to its broad applicability, pronounced selectivity, and the potential for renewing and reusing adsorbents. Metal-organic frameworks(MOFs), characterized by their porous structure, have emerged as a premier choice for adsorbing heavy metal ions, thanks to their substantial specific surface area, robust stability, and minimal density. This comprehensive review aims to encapsulate and delve into the adsorption parameters, kinetics, and mechanisms inherent in the utilization of highly efficient and recyclable MOF composites for Pb(Ⅱ) adsorption in water. This effort seeks to provide a foundational guide for prospective research endeavors and practical implementations.

关键词： MOFs Adsorption Mechanism Pb(II) Thermodynamics Wastewater

Insights into spin polarization regulated exciton dissociation and charge separation of C_(3)N_(4)for efficient hydrogen evolution and simultaneous benzylamine oxidation

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Nano Research 2023年第7期16卷 8845-8852页

作者： Gen Li Xiaomei Sun Peng Chen Meiyang Song Tianxiang Zhao Fei Liu Shuang-Feng Yin provincial guizhou Key Laboratory of Green Chemical and Clean Energy Technology School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China College of Chemistry and Chemical Engineering Advanced Catalytic Engineering Research Center of the Ministry of EducationState Key Laboratory of Chemo/Biosensing and ChemometricsHunan UniversityChangsha 410082China

The employment of spin polarization under an external magnetic field holds great potential for the improvements of photocatalytic ***,owing to the huge difference in dielectric properties between ferromagnetic oxide and polymers,the photogenerated excitons with spin states are often limited to the ferromagnetic oxide wells,which leads to unsatisfactory *** this paper,a single-atom Co-doped C_(3)N_(4)photocatalyst is successfully synthesized for photocatalytic water splitting and simultaneous oxidation of *** a tiny external magnetic field(24.5 mT),the hydrogen production rate could reach at 3979.0μmol·g^(-1)·h^(-1),which is about 340 times that of C_(3)N_(4).Experimental results and theoretical calculations indicate that the interaction of Co d and N p orbital changes the symmetry center of C_(3)N_(4),resulting in an increase in dielectric constant and spin ***,magnetic fields further promote parallel electron spin,and the increased number of charges with the parallel spin-down state is likely to dissociate under the action of an external magnetic *** the other hand,the Co-N bond provides a huge built-in electric field and active site for strengthening the charge transfer and surface *** work not only deepens the understanding of spin polarization,but also enriches methods to accelerate electron-hole separation.

关键词： low magnetic field C_(3)N_(4) spin polarization photocatalytic hydrogen evolution benzylamine oxidation

In situ deformation behavior of TC21 titanium alloy with different α morphologies(equiaxed/lamellar)

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Rare Metals 2021年第5期40卷 1173-1181页

作者： Wei Long Mei-Gui Ou Xi-Qin Mao Yi-Long Liang College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of guizhou Province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

To study the effect ofαphase morphology(equiaxedα(αE)/lamellarα(αL))on the in situ tensile behavior of TC21 alloy,the slip band,dislocation,crack initiation,and propagation were analyzed by scanning electron microscopy(SEM)with in situ tensile stage and transmission electron microscopy(TEM).The results show that the slip bands first concentrate in theαE phases and easily truncate at theα/βphase boundaries,whereas the slip bands move across theαlamellae in theαL *** are easily generated inαE orα/βphase boundaries with large plastic *** the quantity ofαL is more thanαE,the crack tip is more easily deflected atαphases orαclusters with different orientations,making the main crack propagation path more *** the volume fraction ratio ofαE toαL is~3:4,i.e.,the volume fraction ofαE is close to that ofαL,TC21 alloy exhibits better strength and slower crack propagation rate.

关键词： In situ tensile TC21 alloy Equiaxed Lamellar αPhase

Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 296-304页

作者： Wei Long Song Zhang Yi-long Liang Mei-gui Ou College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of guizhou province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

Duplex-structured TC21 alloy samples were first solution-treated at a higher temperature in theα+βregion(940°C)with furnace cooling(FC),air cooling(AC),and water cooling(WC),followed by a second-stage solution treatment at a lower temperature in theα+βregion(900°C),and then finally aged at 590°*** effects of the morphology and quantity ofαphases on the structure and properties of the TC21 alloy after the different heat treatments were *** in-situ tensile deformation process and crack propagation behavior were observed using scanning electron microscopy(SEM).The quantity of equiaxedαphases as well as the thickness of lamellarαphases reduced,the tensile strength increased firstly and then decreased,the elongation decreased with the increasing cooling rate after the first-stage solution *** amount and size of lamellarαphases increased after the second-stage solution treatment because of sufficient diffusion of the alloying elements,thereby leading to increased tensile *** amount of dispersedαphases increased after the third-stage aging treatment owing to the increase in the nucleation rate,resulting in a noteworthy strengthening *** the third-stage aging treatment,the first-stage FC sample exhibited better mechanical properties because it contained more equiaxedαandβtrans phases than the first-stage AC and WC samples.

关键词： multi-stage heat treatment titanium alloy in-situ tension microstructure mechanical properties