Food Bioscience
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2024
·
IF 4.8
Yan Zhu,Yameng Gao,Wenke Wang,Wenjie Kan,Caiguo Tang,Lifang Wu
Fusarium graminearum ( F. graminearum ) poses a substantial threat to global food security, with its impact closely linked to environmental conditions. This study aims to anticipate F. graminearum spore growth across diverse environments and assess alterations in the fungistatic capacity of hydrogen sulfide (H 2 S) gas in response to environmental variations. The experimental data, namely spore germination ratios, are monitored and recorded at hourly intervals across 100 permutations comprising four distinct temperature levels, five varying pH values, and five diverse concentrations of H 2 S. The investigation integrates three environmental factors as input variables, utilizing a feedforward neural network to establish growth boundaries based on spore germination ratios. The accuracy of models at various stages–training, validation, and testing–is evaluated using a confusion matrix. Logistic regression models are employed for effectiveness comparison with neural networks. Results indicate that neural networks successfully predict F. graminearum spore germination events. Notably, H 2 S does not influence the temperature preferences of spores. Temperature has a more substantial impact on the fungistatic ability of H 2 S compared to pH. The study reveals the adaptability of F. graminearum spores to adverse conditions over time. This research delves into temperature, pH, and H 2 S synergistic effects on spore germination, contributing to predictive models for F. graminearum and enhancing our understanding of how environmental factors regulate its growth.
研究领域:
微生物学
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环境科学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 26
·35113-35125
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IF 4.223
An Shaorong,Jin Qiang
In recent years, the excess discharge of ammonia nitrogen from wastewater into surface water has been regulated by more stringent standard. The air stripping method is successfully used to treatment of high-concentration ammonia nitrogen; however, alkali will be added to keep pH more than 10, which is costly and not environment-friendly operation. In this study, an advanced air stripping (AAS) based on foam separation of removing ammonia nitrogen in low concentration from aqueous solution at low pH was proposed. The effect of conditions such as air flow rate, temperature, SDS dosage, coexisting ionic strength, pH, and initial ammonia nitrogen concentration on the removal efficiency was studied. The advanced air stripping exhibited favorable removal efficiency for NH 4 + -N in low concentration from aqueous solution (20 mg·L −1 ) with a broad range of low pH 3.0–9.0. Besides, for strongly alkaline (pH=11.0) solution, the advanced air stripping can alleviate the decrease of pH to some extent and keep ammonia nitrogen stripping out continuously based on equilibrium shift between NH 4 + and NH 3 . A microcalorimeter was applied to demonstrate the interaction between the negatively charged hydrophilic groups of SDS and NH 4 + ions, helping to understand the mechanisms more clearly. The simple operation and the satisfactory removal efficiency could imply that the advanced air stripping is a promising technology for minimizing low-concentration NH 4 + -N. Graphical abstract
研究领域:
环境科学
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废水处理
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 317
·期 3
·1235-1241
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IF 1.181
Wang Cheng,Xiao Fang-zhu,Pu Yi-qiu,Xu Yu-li,Xu Dong-yang,Zhang Kang,Liu Yong,Peng Guo-wen
P -carboxyphenyl azo calix[4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix[4]arene as raw material. The P-CACPD was characterized by FT-IR and 1 H-NMR. The effects of pH, extraction time and temperature on the extraction of U(VI) by P-CACPD were investigated. The results show that pH value, extraction time and temperature have an effect on the extraction of U(VI) by P-CACPD. When the initial pH is 5, temperature is 25 °C, extraction time is 2 h, the extraction rate of U(VI) by P-CACPD reaches the maximum. Both kinetics parameters and thermodynamic parameters of the extraction process were calculated. The calculated data indicate that the extraction process of uranium by P-CACPD is an exothermic spontaneous process, which well fits with the pseudo-second-order kinetic model.
研究领域:
化学
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环境科学
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DOI
高影响因子
GEOFLUIDS
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2020
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IF 1.534
Xiaolin Wang,Ye Qiu,I-Ming Chou,Rongqing Zhang,Guanglai Li,Richen Zhong
In situ Raman spectra of aqueous K2WO4-HCl, K2WO4-HCl-NaCl, and K2WO4-CO2-NaCl solutions were collected at elevated temperature (, 100–400°C) and constant pressure () of 30 MPa. The stretching vibration band of the W=O bond () was analyzed to reveal the species of tungsten (W) responsible for the hydrothermal transport of W during mineralization. Results showed that monomeric tungstates with (W=O) bands at ~930 and 950 cm-1 are the dominant W species in weakly alkaline (room temperature, ) to near-neutral (room temperature, ) solutions under the investigated conditions. Overall, the stability of polymeric tungstate species with (W=O) bands at ~965–995 cm-1 decreases with rising temperature and was not detected at ≥300°C in moderately acidic solution (room temperature, ). However, increased fluid acidity and salinity obviously enlarged the temperature stability field of polymeric tungstate species. In highly acidic solution (room temperature, ), polymeric tungstates are the only stable W species even at 400°C. In the presence of 1.9 mol/kg NaCl, polymeric tungstate(s) can persist to at least 350°C in moderately acidic solution. Considering that 300–350°C is the major W-mineralizing range and W-mineralizing fluid is generally characterized by a moderately acidic nature, we propose that, in addition to monomeric tungstates, polymeric tungstates can also be important W species in some natural geological fluids that are responsible for the mineralization of W. Future studies of the W mineralization mechanism should take this issue into account.
研究领域:
地球化学
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矿物学
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高影响因子
CLEAN-Soil Air Water
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2015
·Vol. 44
·期 1
·72-77
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IF 1.945
Qun He,Ruijuan Qu,Xinghao Wang,Zhongbo Wei,Ping Sun,Zunyao Wang
Although it has been widely known that arsenic poses great threat to organisms and arsenic species account for the toxic effect of the metalloid, relatively little attention has been given to the arsenic toxicity to different organisms at different pH values. Three kinds of aquatic organisms including Photobacterium phosphoreum , Daphnia magna , and Danio rerio were used to study the effects of pH on the toxicity of arsenic. Toxicity test results were analyzed by calculating EC 50 values and for arsenic species at five different pH values (5.0, 6.0, 7.0, 8.0, and 9.0). As a result, As(III) is more toxic to the tested organisms than As(V), and P. phosphoreum was more sensitive to the toxicity of arsenic than D. magna and D. rerio . The toxicity of As(III) species is different for different organisms: dihydrogen arsenite, H 2 AsO 3 – , is more toxic to P. phosphoreum and D. rerio than arsenous acid, H 3 AsO 3 , while H 3 AsO 3 is more toxic to D. magna . As for As(V), arsenate, HAsO 4 2− , is the most toxic to P. phosphoreum , whereas dihydrogen arsenate, H 2 AsO 4 – , may be responsible for the toxicity to D. magna and D. rerio . As(III) and As(V) are more toxic to P. phosphoreum in an alkaline environment, while for D. magna in an acidic environment and As(III) is more toxic to D. rerio in an alkaline environment and As(V) in an acidic environment.
研究领域:
环境生物学
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毒理学
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Leipeng Ji,Haomiao Xu,Xiaoming Sun,Wenjun Huang,Zan Qu,Yongjun Wang,Anbang Zhang,Naiqiang Yan
Sulfidation has been an efficient method for arsenic (As) removal from acid wastewater, yet it is inefficient under neutral and weak acid conditions. The higher pH values resulted in the formation of the unstable As-S precipitates, especially employing Na 2 S as the vulcanizing agent as it can increase the pH value dramatically. Here, we found that SO 2 exhibited excellent multi-roles in As removal when applying H 2 S-sulfidation method. The acidification effect of SO 2 lead to the decreasing of pH values, guaranteed the stable As-S precipitates formation. Through the SO 2 pre-treatment method, the results indicated that the pH values decreased from 7 to 2.8, with the increased H 2 S utilization efficiencies for As(III) removal from 20.9% to 92.0%. Moreover, SO 2 post-treatment not only increased the As(III) removal efficiency, but also eliminated the excessive sulfides in solution. The reaction mechanism analysis indicated that the liquid comproportionation reaction between SO 2 and excessive sulfides plays a vital role. The generated nascent sulfur (N-S 0 ) can adsorb arsenic species and promote the agglomeration of As(III)-S precipitates. Furthermore, the SO 2 and H 2 S co-treatment exhibited excellent As(V) removal performance. This study provides a new alternative method to improve the H 2 S-sulfidation process with SO 2 for As removal from wastewater.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Hongxia Tan,Yao Li,Hongyuan Zhou,Ting Guo,Ying Zhou,Yuhao Zhang,Liang Ma
The productions of food, agricultural products and feed involve a variety processing conditions, which can affect the release/binding of zearalenone (ZEN) with macro-components in maize, resulting in the interconversion of hidden ZEN with free ZEN. This interconversion can cause the uncertainties and individual differences in the exposure assessment. To fully overcome this uncertainties of the potential risks for humans and animals, further research regarding the key factors and rule of interconversion is needed. This study was designed to analyze the key factors that can induce the interconversion of hidden ZEN with free ZEN during maize processing. Results showed the conversion of hidden ZEN into free ZEN during thermal and alkaline processing, while it showed the conversion of free ZEN into hidden ZEN during acid processing. Furthermore, the temperature and pH-induced interconversion rules were also applicable to the practical maize processing (tortilla production). During producing tortilla, when the processing conditions of 4% lime, cooking time (60 min) and cooking temperature (100 °C) were set, the tortilla products with the lower hidden ZEN hazard could be obtained. This study presented new insights into the risk assessment of maize products as the conversion between hidden ZEN and free ZEN during processing.
研究领域:
食品安全
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毒理学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF COSMETIC SCIENCE
·
2015
·Vol. 37
·期 5
·474-478
·
IF 1.377
C. Lv,J. Hou,W. Xie,H. Cheng
Synopsis en This link goes to a English section fr This link goes to a French section Objective To understand formaldehyde residue in cosmetics, an investigation on formaldehyde release from eight preservatives (methenamine – MA, paraformaldehyde – PF, poly(p-toluenesulfonamide-co-formaldehyde) -PTSAF, quaternium-15 – QU, imidazolidinyl urea – IU, diazolidinyl urea – DU, dimethyloldimethyl hydantoin – DMDM and bronopol – BP) under various conditions was performed. Methods The concentration of released formaldehyde was determined by high-performance liquid chromatography with photodiode array detection after derivatization with 2,4-dinitrophenylhydrazine. Results The amounts of formaldehyde release were in the order of PF > DU > DMDM ≈ QU ≈ IU > MA > BP > PTSAF. The releasing amounts of formaldehyde were the highest in the presence of aqueous matrices for the releasers except QU and IU, and the releasing effect was also relative to pH. More formaldehyde was released with longer storage time and higher temperature. Furthermore, all preservatives in cosmetic matrices released fewer amounts of formaldehyde than in pure aqueous or organic matrices, and the formaldehyde-releasing amounts were also cosmetic specific. Conclusion Formaldehyde release was dependent on the matrix, pH, time and mainly temperature, and the releasing effect was also cosmetic specific. Résumé en This link goes to a English section fr This link goes to a French section Objectif Pour comprendre les résidus de formaldéhyde dans les produits cosmétiques, une étude du dégagement de formaldéhyde de huit conservateurs (méthénamine -MA, paraformaldéhyde -PF, poly (p-toluènesulfonamide-co-formaldéhyde) -PTSAF, quaternium-15 -QU, imidazolidinylurée -IU, diazolidinylurée -DU, dimethyloldimethyl -DMDM hydantoïne et bronopol -BP) dans diverses conditions a été réalisée. Methodes La concentration de formaldéhyde libéré a été déterminée par Chromatographie liquide à haute performance avec détection à réseau de photodiodes après dérivatisation avec du 2,4-dinitrophénylhydrazine. Résultats Les taux de dégagement de formaldéhyde étaient dans l'ordre décroissant PF> DU> DMDM ≈ UI> MA ≈ QU> BP> PTSAF. Les taux de libération de formaldéhyde étaient les plus élevés en présence de matrices aqueuses pour les libérateurs sauf QU et IU et l'effet de libération était également variables selon le pH. Plus de formaldéhyde a été libéré plus la durée du temps de stockage et la température étaient élevées. En outre, tous les conservateurs dans les matrices cosmétiques libéraient moins de quantités de formaldéhyde que dans les matrices aqueuses ou organiques purs et les taux de libération de formaldéhyde étaient également spécifique pour chaque cosmétique. Conclusion Le dégagement de formaldéhyde était dépendant de la matrice, du pH, du temps de stockage et surtout de la température et l'effet de libération était aussi spécifique de la formulation cosmétique
研究领域:
化学
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毒理学
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高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2018
·
IF 3.466
Qinghui Wang,Xiaoyu Ding,Yuhui Wang,Qian Du,Tianguo Xu,Bin Du,Hanchun Yao
Tumor pH detection and pH value change monitoring have been of great interest in the field of nanomedicine . In this study, a pH-sensitive near-infrared fluorescence probe SiRB (Si-rhodamine and Boronic acid group) was synthesized by introducing a boronic acid group into the silicon rhodamine structure. ICG (Indocyanine green) as the fluorescence internal standard and SiRB were loaded into PLGA (poly lactic- co -glycolic acid) to form PLGA-SiRB-ICG nanoparticle . The experiments showed that the size of the nanoparticle was about 90 nm, which can reach tumor passively by enhancing permeability and retention effect. PLGA in the acidic environment will accelerate the release of cleavage, and the fluorescence ratio of the two probes can reflect the specific pH value in the tumor. The results indicated that the nanoparticle could quantitatively measure the pH value of the tumor site, which is expected to be used in tumor research and treatment.
研究领域:
纳米医学
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生物化学
·
肿瘤学
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PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2012
·Vol. 7
·期 6
·940-947
·
IF 0.758
Jianxian Zeng,Qincheng He,Hu Zhou,Xiahui Sun,Jiaojiao Zhang
Complexation–ultrafiltration process was investigated for cerium(III) recovery from aqueous solutions by using poly (acrylic acid) sodium salt (PAASS) as a complexing agent. The adsorption of cerium(III) on PAASS was preliminarily studied at different pH values. Next, effects of pH, polymer metal ratio (PMR), calcium(II) and competitive complexing agents on permeate flux ( J ) and cerium rejection coefficient ( R ) were investigated in the total recirculation mode. Finally, the integrations of four experiments including concentration, decomplexation, regeneration of PAASS and reuse of regenerated PAASS were carried out. Obtained results show that the adsorption can be described well using the Langmuir equation. If pH is reduced below 4, J decreases rapidly. PMR has negligible effect on J . R increases with increasing pH or PMR. Calcium(II) and ethylenediaminetetraacetic acid disodium salt have the effects on R , but these effects can decrease by increasing pH. Tartrate sodium does not influence R . In the process of concentration, J declines slowly, and R is about 1. It takes 40 min to reach the decomplexation equilibrium at pH 3. The decomplexation percentage of cerium(III)–PAASS complex is about 70%. In the regeneration of PAASS, cerium(III) can be removed effectively, and the purification of regenerated PAASS is acceptably satisfactory. The binding capacity of regenerated PAASS is close to that of fresh PAASS, and the recovery percentage of binding capacity is higher than 90%. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
环境科学
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高影响因子
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2016
·Vol. 72
·期 1
·153-165
·
IF 2.039
Ma Taowu,Wang Meng,Gong Shuangjiao,Tian Bin
The environmental factors are expected to affect the ecotoxicity of heavy metals in the presence of engineered nanoparticles (NPs) in aquatic ecosystems. However, in sediment scenario, little is known regarding their impacts on the ecotoxicity of co-exposure of sediment-associated heavy metals and NPs. This study evaluated the impacts of different levels of organic matter (OM) (4.8–11.6%) and pH (6–9) on the ecotoxicological effects of co-exposure of sediment-associated titanium dioxide nanoparticles (TiO 2 -NPs) and cadmium (Cd) to a freshwater gastropod Bellamya aeruginosa . The burdens of Ti and Cd and biomarkers of DNA damage, Na + /K + -ATPase, lipid peroxidation (LPO), and protein carbonylation (PC) in the hepatopancreas were determined following 21 days of exposure. At background level of OM (4.8%) in sediments, TiO 2 -NPs significantly promoted Cd accumulation in low-Cd treatments (5 mg/kg) but did not promote Cd accumulation in high-Cd treatments (25 mg/kg). At the relatively higher OM levels (7.1 and 11.6%), TiO 2 -NPs significantly enhanced Cd accumulation and toxicity as evidenced by aggravated DNA damage, decreased Na + /K + -ATPase activities, and increased LPO and PC levels. Moreover, Cd burdens in both low-Cd and high-Cd treatment were positively correlated with corresponding Ti burdens, indicating TiO 2 -NPs partially acted as carrier of Cd. At all pH levels, in low-Cd treatments, TiO 2 -NPs did not affect Cd accumulation, LPO, and PC levels but significantly enhanced DNA damage and slightly facilitated the inhibition of Na + /K + -ATPase activities. In high-Cd treatments, only at pH 9, TiO 2 -NPs significantly enhanced Cd accumulation and toxicity. Our results implied that interaction between TiO 2 -NPs and OM or pH significantly affected the accumulation and toxicity of Cd in B. aeruginosa , but the underlying mechanisms need further investigation. Additionally, it should be noted that the potential ecological risk of co-exposure of NPs and coexisting pollutants might be closely species-specific and related to environmental media.
研究领域:
环境科学
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毒理学
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PubMed
高影响因子
Environmental Science-Nano
·
2017
·Vol. 4
·期 7
·1544-1552
·
IF 6.047
Can Wu,Jingwei Tu,Weizhen Liu,Jing Zhang,Shengqi Chu,Guining Lu,Zhang Lin,Zhi Dang
The pH has a significant impact on arsenic (As) removal by nano zero valent iron (nZVI). However, most studies consider the influence mechanism just from the aspect of electrostatic interactions. In this study, based on the different As(V) adsorption capacity of nZVI and zero valent iron (ZVI) after normalization by specific surface area, we deeply analyze the comprehensive mechanism of arsenic adsorption by nZVI at varying pH values. Batch experiment shows that pH variation has a weaker influence on the As(V) adsorption by nZVI compared to ZVI. X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES) analysis indicated that with the coexistence of low concentration As(V) species, the increasing pH value condition does not significantly change the phase of ZVI; however, it decreases the lepidocrocite (γ-FeOOH) and increases the magnetite/maghemite (Fe3O4/γ-Fe2O3) content in the corrosion products of nZVI, while the latter has stronger adsorption affinity to As(V). An increase in the solution pH causes a change in the nature of the corrosion products, enhancing the adsorption affinity of nZVI towards As(V), which complements the negative impact from electrostatic repulsive-force. This study clearly demonstrated that the corrosion of nZVI plays a more important role in As(V) adsorption compared to electrostatic interactions. This indicates that nZVI is a promising nanomaterial with unique properties that aid in the removal of As(V) in a broad pH range and complicated environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）