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ph value monitoring during human albumin purification with near infrared spectroscopy and chemometrics

Journal of Innovative Optical Health Sciences 2018年第3期11卷 28-37页

作者： Qiaofeng Sun Zhongyu Sun Fei Wang Lian Li Ronghua Liu Lei Nie Jiayue Wang Mingyu Wang Hengchang Zang School of pharmaceutical Sciences Shandong University Wenhuaxi Road 44 Jinan 250012P.R.China School of Basic Medical Sciences Shandong University Wenhuaxi Road 44 Jinan 250012P.R.China Shandong Taibang Biological Products Limited Company No.14 East Hushan Road Taian 271000P.R.China

Human albumin(HA)is a very important blood product which requires strict quality *** precipitation is a key step which has a great effect on the quality of final ***,a new method based on quality by design(QbD)was proposed to investigate thefeasibility of realizing online quality control with the help of near infrared spectroscopy(NIRS)and *** ph value is the critical process parameter(CPP)in acid precipitationprocess,which is used as the end-point *** batches,a total of 74 samples of acidprecipitation process,were simulated in our *** batches were selected randomly as cali-bration set and remaining two batches as validation ***,the analysis based on materialinformation and three dfferent variable selection methods,including interval partial least squaresregression(iPLS),competitive adaptive reweighted sampling(CARS)and correlation coeficient(CC)were compared for eliminating irrelevant variables,Fimally,iPLS was used for *** quantitative model was built up by partial least squares regression(PLSR).Thevalues of determination coeficients(R^(2)_(C) and R^(2)_(P)),root mean squares error of prediction(RMSEP),root mean squares error of calibration(RMSEC)and root mean squared error of crossvalidation(RMSECV)were 0.969,0.953,0.0496,0.0695 and 0.0826,*** paired t test and repeatability test showed that the model had good prediction ability and *** results indicated that PLSR model could give accurate measurement of the ph value.

关键词： Near infrared spectroscopy human albumin acid precipition proces ph value chemometrics

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Effect of solution ph value changes on fluorescence intensity of magnetic-luminescent Fe3O4@Gd2O3：Eu^3＋ nanoparticles

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Journal of Rare Earths 2016年第1期34卷 71-76页

作者：吴拓潘桦滟陈如标罗东张宏沈晔李旸晖王乐 College of Optics and Electronic Science and Technology China Jiliang University Hangzhou 310018 China

In this paper, bifunctional Fe3O4@Gd203：Eu3＋ core-shell nanoparticles with both magnetic and fluorescent properties were synthesized through a urea homogeneous precipitation （UHP） method. Particular emphasis was placed on investigating the influence of the solution ph value on the photoluminescence of the core-shell nanocomposites. It showed that the samples treated at the solution of ph=3.0 had the highest luminescence due to the enhanced crystallinity and size tmiformity of nanoparticles. The Fe3O4@Gd2O3：Eu3＋ nanocomposites exhibited an almost spherical shape with a mean diameter of 60 nm, and had strong red emissions of Eu3＋ at 612 nm as well as good magnetization with the saturation magnetization of 1.29 emu/g. It thus indicated that the core-shell nanocomposites investigated has great potential in biomedical applications.

关键词： nanocomposites ph value magnetic properties luminescence properties rare earths

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Influences of ph value in deposition-precipitation synthesis process on Pt-doped TiO_2 catalysts for photocatalytic oxidation of NO

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Journal of Environmental Sciences 2012年第8期24卷 1519-1524页

作者： Shuzhen Song Zhongyi Sheng Yue Liu Haiqiang Wang Zhongbiao Wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China Guodian Science and Technology Research Institute Nanjing 210031China

This work has been undertaken to study the influences of ph value on the characteristics and activity of photocatalyst by deposition- precipitation method during its preparation process. A series of Pt-modified TiO2 were prepared by deposition-precipitation method at different ph values as well as wet impregnation method, and characterized by XRD, XPS, TEM, UV-Vis and photoluminescence （PL）. It was found that the catalysts had the highest photocatalytic activity for NO conversion when ph value was kept at around 7. And the sample prepared by deposition-precipitation method showed higher activity than that by impregnation method. This was mainly due to their high value in highly-dispersed platinum oxides （PtOx） content on the surface of the catalysts. The results from UV-Vis absorption showed that highest absorbance was obtained for Pt/TiO2 prepared at ph values of around 7. And PL spectra results indicated that the recombination rate of photogenerated electrons and holes of the samples prepared by deposition-precipitation method was lower than that prepared by impregnation method. And in the zeta potential study, the ph values for the isoelectric point of the preparing slurry of 0.05 wt.%Pt/TiO2 and 0.5 wt.%Pt/TiO2 were determined to be 6.5-8.5, which further confirmed the enrichment of PtOx dopants for the catalysts repapered when ph value was around 7.

关键词： ph value ZiO2 PtOx NO photocatalysis zeta potential

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Influence of ph value on properties of YPO_4:Tb^(3+) phosphor by co-precipitation method

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Journal of Rare Earths 2015年第4期33卷 346-349页

作者：李旭王皓岩关丽付跃举郭镇袁坤生铁利成杨志平滕枫 Hebei Key Laboratory of Optic-electronic Information and Materials College of Physics Science and Technology Hebei University Key Laboratory of Luminescence and Optical Information Ministry of Education School of Science Beijing Jiao Tong University

A series of Y1_xPO4：xTb3＋（x=0.005-0.1） phosphors were successfully fabricated by using co-precipitation method with NHzH2PO4 as phosphorus source. The structure and morphology characterization of the luminescent material was investigated with X-ray powder diffraction （XRD） and field emission scanning electron microscopy （FESEM）. The XRD patterns indicated that the samples belonged to tetragonal phase. Luminescence properties were discussed by measuring the excitation and emission spectra. The phosphor could be excited by UV light （340-390 nm） and emitted green light, with the emission peaks located at 491 （5Da→7F6）, 550 （SD4→7Fs）, 589 （5D4→7F4） and 624 nm （SD4→TF3）. In addition, the ph value and activator concentration had great effects on the emission intensity. The results illuminated that this phosphor could be used for UV based white light emitting diodes and co-precipitation method could be used to prepare better appearance phosphor.

关键词： luminescence phosphor co-precipitation ph value rare earths

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Shortwave infrared hyperspectral imaging for detection of ph value in Fuji apple

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International Journal of Agricultural and Biological Engineering 2014年第2期7卷 130-137页

作者： Guo Zhiming Huang Wenqian Chen Liping Peng Yankun Wang Xiu Beijing Research Center of Intelligent Equipment for Agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China College of Engineering China Agricultural UniversityBeijing 100097China National Engineering Research Center of Intelligent Equipment for Agriculture Beijing 100097China

ph value is regarded as one of the most important attributes that affect sensory characteristics and edible quality of *** objective of the research was to explore the feasibility of applying shortwave infrared hyperspectral imaging system to detect the ph value of apple.A shortwave infrared hyperspectral imaging system was developed over the wavelength region of 1000-2500 nm and used to acquire hyperspectral images of apple *** reflectance calibration,mean reflectance spectral was calculated by averaging the intensity of all pixels within the roundness region of interest(ROI).Synergy interval partial least squares(siPLS)algorithms as an effective multivariable method was conducted on the calibration of regression model to estimate the ph value in Fuji *** performance of the final model was back-evaluated according to root mean square error of calibration(RMSEC)and correlation coefficient(Rc)in calibration set,and tested in prediction *** optimal prediction siPLS model was obtained with correlation coefficient(Rp)of 0.8474 and mean square error of prediction(RMSEP)of *** results indicated that shortwave infrared hyperspectral imaging combined with siPLS chemometrics could be an accurate and fast method for nondestructive prediction of ph value in Fuji apple.

关键词： shortwave infrared hyperspectral imaging synergy interval partial least squares ph value apple

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Capacitance Characterization of the Effect of ph value on the Self-assembled Monolayers of Octadecanethiol

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Chinese Chemical Letters 2003年第4期14卷 411-412页

作者： KeQiangDING QingFeiWANG RuTingTONG HuiBoSHAO ChemistryCollege HebeiTeachersUniversityShijiazhuang050016 DepartmentofChemistry CapitalNormalUniversityBeijing100037

In this paper, the membrane capacitance (Cm), which was obtained from the electro- chemical impedance spectroscopy (EIS) method, was used to characterize the effect of ph value on the self-assembled monolayers (SAMs) of octadecanethiol(18SH) for the first time. The results not only strongly proved that inorganic ions could penetrate the SAMs of 18SH, but also ascertained that SAMs of 18SH were not an absolute of free of ion-penetration. Verifying the existence of pin-holes in the octadecanethiol SAMs was the main contribution of this paper, which coincided with the former conjecture very well.

关键词： Octadecanethiol SAMs effect ph value capacitance characterization.

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Electrochemical Behavior of Steel Bar in Electrolytes:Influence of ph value and Cations

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1133-1136页

作者：濮琦 College of Mechanics and Materials Hohai University

Steel bar corrosion on electrolytes and the influence of cation were investigated. Three electrolytes of Ca（OH）2, NaOH and KOH with ph levels of 12.5, 11.5, 10.5, 9.5, 8.5 were prepared, meanwhile, the methods of free corrosion potential and electrochemical impedance spectra （EIS） were used to evaluate the influence of cations on the depassivation of the steel bar in electrolytes. The experimental results indicate that the initial corrosion ph value of the steel bar is influenced by the cation in electrolyte and the influence of K＋ in electrolyte is the most remarkable, followed by Na＋ and Ca2＋. The initial corrosion ph values are 10.5 in KOH electrolyte, 9.5 in NaOH electrolyte and lower than 8.5 in Ca（OH）2 electrolyte.

关键词： steel bar corrosion cation ph value

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Comparison of ph value, TBA value, Glycogen and Lactic Acid Content in Muscle of Landrace and Yorkshire under Different Storage Time and Conditions

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Animal Husbandry and Feed Science 2017年第3期9卷 145-150,164页

作者： Zhang Yin Guo Jianfeng Lin Haichao Wang Jiying Wang Cheng Wu Ying Institute of Animal Husbandry and Veterinary Medicine Shandong Academy of Agricultural Sciences/Shandong Provincial Key Laboratory of Animal Disease Control and Breeding

In order to assess the meat quality under different storage time and conditions, the ph value, TBA value, glycogen and lactic acid content in muscle of Landrace and Yorkshire were measured. The results showed that within 10 h post slaughtering, post slaughtering time had extremely significant influence on ph value and lactic acid content of Landrace, but had no significant influence on glycogen content and TBA value. On the other hand, post slaughtering time had extremely significant influence on ph value of Yorkshire, but had no significant influence on glycogen, lactic acid content and TBA value. The ph values of Yorkshire at 3, 5 and 10 h post slaughtering were 5.21% （ P 〈 0.01 ）, 5.64% （ P 〈 0.05 ） and 5.59% （ P 〈 0.05 ） higher than those of Landrace, respectively ; the lactic acid content in muscle of Landrace at 10 h post slaughtering was 56.04% （P 〈0.05） higher than that of Yorkshire; the TBA value in muscle of Yorkshire at 10 h post slaughtering was 89. 19% （P 〈 0.01 ） higher than that of Landrace; there was no significant difference in glycogen content between Yorkshire and Landrace. When pork stored at 4℃, storage time had no significant influence on ph value and glycogen content in muscle of Landrace, but had significant influence on drip loss, lactic acid content and TBA value ; storage time had no significant influence on ph value, glycogen content and TBA value in muscle of Yorkshire, but extremely significant influence on drip loss and significant influence on lactic acid content. The ph value in muscle of Yorkshire at 24 h post storage at 4℃ was 6.56% （P 〈0.05） higher than that of Landrace; the glycogen contents in muscle of Landrace at 24, 48, 72, 96, 120 and 144 h post storage at 4℃ were 84.90% （P〈0.05）,78.40% （P〈0.01）, 101.87% （P〈0.05）, 83.80% （P〈0.05）, 83.59% （P〈 0.05）and67.25% （P〈0.01）higher than those of York-shire, respectively; the drip loss of Landrace at 72 h post storage and TBA value at 144 h post storage were 55.70% （ P 〈 0.05 ） and 141.

关键词： Pork Storage time and conditions ph value Glycogen Lactic acid content TBA value

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Effect of ph value on Nano-Al_2O_3/Ni+Co Gradient Bionic Composite Coating by Electrodeposition

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Journal of Wuhan University of Technology(Materials Science) 2009年第S1期24卷 50-53页

作者：刘燕任露泉 The Key Laboratory of Bionic Engineering The Ministry of EducationJilin University

The metal and nano-ceramic composite coatings were formed on gray cast iron surface by electrodepositon *** Ni-Co was used as metal matrix,and the nano-Al2O3 was chosen as second-phase *** gradient structure of biology material was the model to avoid bad interface bonding and stress distribution,therefore the gradient composite coating was *** morphology of composite coatings was flatter and the microstructure was more com-pact than the pure Ni-Co *** of ph value on surface morphology was analyzed,which some microcracks appeared when ph value was greater than *** content of codeposition na-no-Al2O3 reached a maximum value at ph value of 3-4,at the same time the properties including mi-crohardness and wear-resistance were *** result indicated that the mirohardness reached a maximum value and the wear loss volume was less at ph value 3-4.

关键词： ph value electrodeposition gradient composite coating microstructure property

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Relationship Between ph value and physical and Chemical Properties of Tobacco-growing Soil

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Agricultural Biotechnology 2021年第2期10卷 99-101,106页

作者： Yunfei CHEN Jiye QIANG Ailian OUYANG Colleege of Agruicultural and Forestry Pu'er UniversityPu'er 665000China Rural Development Research Center Pu'er UniversityPu'er 665000China

[Objectives]This study was conducted to understand the relationship between soil ph and soil physical and chemical properties during tobacco planting.[Methods]Through a field experiment,the ph value of tobacco-growing soil,the contents of mineral nutrients(ammonium nitrogen,alkali-hydrolyzable nitrogen,available potassium,available phosphorus),soil bulk density and porosity were investigated.[Results]The ph value of the soil after tobacco planting increased,and the contents of ammonium nitrogen,alkali-hydrolyzable nitrogen,and available potassium were closely related to the change of ph *** bulk density of the tobacco-planting soil decreased and the porosity *** flue-cured tobacco had certain impacts on soil ph,soil bulk density and other physical and chemical properties.[Conclusions]This study provides a theoretical basis for the investigation of the fertilization laws in the process of tobacco planting and the selection of subsequent crops.

关键词： Tobacco growing soil ph value Mineral nutrients Bulk density Porosity

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