纸喷雾质谱快速定量筛查养殖水中孔雀石绿
作者:
曾栋;喻目千;文瑞芝;冯家力
期刊:
卫生研究 ,2020年49(01):107-111 ISSN:1000-8020
作者机构:
湖南省疾病预防控制中心理化科,长沙410005;长沙市食品药品检验所,长沙410016;中南林业科技大学理学院,长沙410004;[文瑞芝] 中南林业科技大学;[冯家力; 曾栋] 湖南省疾病预防控制中心
关键词:
纸喷雾质谱;低共熔溶剂;养殖水;孔雀石绿
摘要:
目的采用纸喷雾质谱( paper spray ionization mass spectrometry,PSI-MS)技术,建立养殖水中孔雀石绿( malachite green,MG)的快速定量筛查方法。方法以氯仿为萃取剂,低共熔溶剂( deep eutectic solvents,DESs)为助溶剂,快速提取MG,氘代孔雀石绿( malachite green D_5,MG-D_5)同位素内标稀释定量,PSI-MS检测,C_(18)色谱柱( 4.6 mm×250 mm,5 μm) 。结果方法工作曲线范围0.1 ~ 10 μg /mL(相关系数>0.999), 检出限0.03 μg /mL,定量限0.1 μg /mL,日内精密度3.5%,日间精密度6.2%,加标回收率98.9%~106.9%( n = 7), 单个样品PSI-MS检测耗时1 min,检测结果与液相色谱-串联质谱法( liquid chromatography-tandem mass spectrometry,LC-MS /MS)一致。结论所建方法应用于养殖水中MG定量检测,准确可靠,较常规LCMS/MS法简便快速、成本低。
语种:
中文
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油桐籽不同年份和含油率差异对其含油率NIR检测模型影响的研究
作者:
马强;李水芳;付红军;王琼;文瑞芝
期刊:
中国粮油学报 ,2019年34(6):92-96 ISSN:1003-0174
作者机构:
中南林业科技大学理学院,长沙,410004;中南林业科技大学食品科学和工程学院,长沙,410004;[文瑞芝; 付红军; 马强; 王琼; 李水芳] 中南林业科技大学
关键词:
油桐籽;年份;含油率;近红外光谱
摘要:
收集了2014和2015年的油桐籽样本,用偏最小二乘法(PLS)分别建立了单一年份、混合年份及单一年份不同含油率范围的油桐籽含油率近红外光谱(NIR)检测模型,并验证.结果 显示单一年份模型对本年份样本有较好预测,而对另一单一年份样本的预测精度明显下降,而混合年份模型对各年份样本都有较好预测;同年份不同含油率范围样本所建模型,含油率范围大,则模型预测精度下降,但稳定性更好.利用竞争性自适应重加权(CARS)算法筛选出30个变量,并结合PLS对混合年份样本建模,既简化了模型,又提高了模型预测性能,验证集相关系数为0.929,均方根误差为1.765,相对标准偏差为3.31%.因此,建立油桐籽含油率NIR检测模型时,应收集不同年份、不同含油率范围样本,并结合特征波长,以建立预测精度更好、稳定可靠且适应范围广的检测模型.
语种:
中文
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气相色谱- 质谱法分析柚木光辐射前后的抽提物成分
作者:
李慧;曾栋;黄自知;马强;王琼;...
期刊:
中南林业科技大学学报 ,2018年38(2):122-128 ISSN:1673-923X
作者机构:
中南林业科技大学理学院, 湖南, 长沙, 410004;湖南省疾病预防控制中心, 湖南, 长沙, 410005;[李慧; 黄自知; 马强; 王琼; 胡云楚; 文瑞芝] 中南林业科技大学理学院, 湖南, 长沙, 410004;[曾栋] 湖南省疾病预防控制中心, 湖南, 长沙, 410005
关键词:
柚木;抽提物;光辐射;光变色;气相色谱-质谱法
摘要:
采用气相色谱-质谱法分析柚木光辐射前后的抽提物成分,考察了柚木光辐射前后的颜色和组成变化,确定了可能引起柚木光变色的主要成分。结果显示,柚木光照100 h后黄蓝指数变化最为明显,表面变成金黄色,从柚木光辐射前后的抽提物中共鉴定出76种成分,其中柚木光辐射前的抽提物中鉴定出55种成分,柚木光辐射后的抽提物中鉴定出49种成分,包括烃类、醇类、酚类、酯类、醛类、酮类、蒽醌类和胺类,辐射后的柚木抽提物中烯烃类从20.11%减少至8.80%,由5种烯烃类减少为4种;酮类从0.99%增加到9.19%,由5种酮类增加为9种;杂环类化合物从20.56%减少到1.54%,由6种杂环类减少为1种。柚木单板表面光辐射后变亮、变黄,随着辐射时间加长,可变成受人欢迎的金黄色,这可能与抽提物中化合物成分的种类和含量有关,木材抽提物中的酚羟基、羰基、双键等结构与木材光变色有很大关系。柚木光辐射前抽提物的成分主要为反式角鲨烯(20.108%)、2-甲基蒽醌(13.110%)、1-甲基-3,4-二氢异喹啉(12.452%)、2-羟甲基蒽醌(8.210%)、8-甲氧基-1-甲基-.beta.-咔啉(6.552%)这5种化合物,这些主成分都含有与木材光变色相关的双键或者羰基。辐射后除了8-甲氧基-1-甲基-.beta.-咔啉和1-甲基-3,4-二氢异喹啉检测不到以外,相对百分含量减少较大的是反式角鲨烯(9.970%)和2-羟甲基蒽醌(5.368%),只有2-甲基蒽醌(13.678%)相对百分含量增加。而且由于2-甲基蒽醌为黄色晶体,因此推测柚木表面黄色的深浅可能与有效成分2-甲基蒽醌的量有关,但柚木光变色的具体原因和机理还有待进一步研究。
语种:
中文
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农林院校基础化学实验技术人员绩效考核体系
作者:
黄自知;王文磊;文瑞芝;王琼;胡云楚
期刊:
实验技术与管理 ,2018年35(3):239-243 ISSN:1002-4956
作者机构:
中南林业科技大学理学院,湖南长沙,410004;[文瑞芝; 王文磊; 黄自知; 胡云楚; 王琼] 中南林业科技大学
关键词:
实验技术人员;量化标准;绩效考核体系;农林院校
摘要:
化学实验技术人员绩效考核是关系到实验室建设、发展和改革的重要环节。结合中南林业科技大学基础化学实验中心的实际情况,按照科学、公正、客观和全面的原则,提出了一套针对高等农林院校化学实验技术人员的量化标准和绩效考核体系。
语种:
中文
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没食子酸磁性表面分子印迹聚合物的制备与选择性识别性能
作者:
邓慧芸;王斌;吴茂;文瑞芝;马强;...
期刊:
应用化学 ,2018年35(5):600-608 ISSN:1000-0518
作者机构:
中南林业科技大学理学院,应用化学研究所, 长沙, 410004;湘南学院化学生物与环境工程学院, 湖南, 郴州, 423043;[邓慧芸; 王斌; 吴茂; 文瑞芝; 马强; 郭亚平; 谢练武] 中南林业科技大学理学院,应用化学研究所, 长沙, 410004;[邓斌] 湘南学院化学生物与环境工程学院, 湖南, 郴州, 423043
关键词:
表面分子印迹;选择性识别;羟基苯甲酸类化合物;吸附;磁性Fe_3O_4
摘要:
羟基苯甲酸类化合物用途广泛,极性较强,在复杂水溶液体系中这些类似物的分离纯化与分析非常困难.本文以磁性Fe_3O_4纳米颗粒为载体,没食子酸(GA)为模板分子,制备了磁性表面分子印迹聚合物(MIP).利用透射电子显微镜、红外光谱、磁强测定等检测手段对MIP进行了结构表征.并对其吸附性能进行研究,比较了该MIP对GA及其它3种结构类似物的吸附性能差异.结果表明,制备的以GA为模板的磁性分子印迹聚合物为核壳球形结构,键合牢固,对GA的吸附动力学符合准二级动力学方程模型,吸附过程属于Langmuir单分子层吸附.该聚合物对GA表现出优异的选择性识别能力,其吸附量(318 K时37.736 mg /g)远远高于结构类似物.该磁性分子印迹聚合物对模板分子不仅具有特异识别能力,而且能够磁控分离,分离效率高,可用于固相萃取.
语种:
中文
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Rapid analysis of benzoic acid and vitamin C in beverages by paper spray mass spectrometry
作者:
Yu, Muqian;Wen, Ruizhi;Jiang, Le;Huang, Si;Fang, Zhengfa;...
期刊:
Food Chemistry ,2018年268:411-415 ISSN:0308-8146
通讯作者:
Chen, Bo
作者机构:
[Yu, Muqian; Fang, Zhengfa; Jiang, Le; Wen, Ruizhi; Huang, Si; Chen, Bo] Hunan Normal Univ, Minist Educ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.;[Yu, Muqian; Fang, Zhengfa; Jiang, Le; Wen, Ruizhi; Huang, Si; Chen, Bo] Hunan Normal Univ, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Wang, Liping] Hunan Anal & Testing Ctr, Changsha 410004, Hunan, Peoples R China.;[Wen, Ruizhi] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Chen, Bo] H;Hunan Normal Univ, Minist Educ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
关键词:
Benzoic acid;Beverages;Paper spray mass spectrometry;Vitamin C
摘要:
A paper spray mass spectrometry (PS-MS) method has been developed for the rapid quantification of benzoic acid (BA) and vitamin C (VC) in beverages. Using BA-d5 as an internal standard (IS) to analyze BA and VC, the calibration curves ranged from 0.3 to 100 μg/mL for BA and 1 to 100 μg/mL for VC, the linearity was 0.9996 for BA and 0.9973 for VC. The limits of detection (LODs) and limits of quantitation (LOQs) were 0.1 μg/mL and 0.3 μg/mL for BA, 0.3 μg/mL and 1 μg/mL for VC, respectively. The recovery ranged from 91.1 to 106.7% for BA, 92.6 to 108.2% for VC. Compared with HPLC, there is no substantial difference in the quantification of BA and VC in samples, the accuracy was 95.7–102.2%, and the run time is far less than that of the HPLC method. The results indicated that PS-MS is a rapid, environmentally friendly and high-throughput method for the quantification of BA and VC. © 2018 Elsevier Ltd
语种:
英文
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Rapid Analysis of Illegal Cationic Dyes in Foods and Surface Waters Using High Temperature Direct Analysis in Real Time High-Resolution Mass Spectrometry
作者:
Wen, Ruizhi;Zeng, Dong;Yang, Zihui;Jiang, Le;Ma, Ming;...
期刊:
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ,2018年66(28):7542-7549 ISSN:0021-8561
通讯作者:
Chen, Bo;van Beek, Teris A.
作者机构:
[Yang, Zihui; Jiang, Le; Wen, Ruizhi; Chen, Bo; Ma, Ming] Hunan Normal Univ, Minist Educ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.;[Yang, Zihui; Jiang, Le; Wen, Ruizhi; Chen, Bo; Ma, Ming] Hunan Normal Univ, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Wen, Ruizhi] Cent South Univ Forestry & Technol, Sch Sci, Changsha 410004, Hunan, Peoples R China.;[Zeng, Dong] Hunan Prov Ctr Dis Control & Prevent, Changsha 410005, Hunan, Peoples R China.;[van Beek, Teris A.] Wageningen Univ, Lab Organ Chem, Stippeneng 4, NL-6708 WE Wageningen, Netherlands.
通讯机构:
[Chen, Bo] H;[van Beek, Teris A.] W;Hunan Normal Univ, Minist Educ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;Wageningen Univ, Lab Organ Chem, Stippeneng 4, NL-6708 WE Wageningen, Netherlands.
关键词:
illegal cationic dyes;direct analysis in real time;high-resolution mass spectrometry;induced phase separation extraction;rhodamine B;malachite green;crystal violet;methylene blue;food safety
摘要:
A high temperature desorption (HTD) direct analysis in real time-high-resolution mass spectrometric (DART-HRMS) method was developed for the rapid analysis of four banned cationic dyes. Rhodamine B is used to dye foods, while malachite green, crystal violet, and methylene blue are added to fishponds as antimicrobials. A simple induced phase separation extraction was used to pretreat samples. The DART-HRMS method employed two temperature steps, i.e., 200 °C for drying, purification, and enrichment of sample solution and 500 °C for thermal desorption and ionization of analytes. The calibration curves of dyes in the range of 50-2000 ng/mL were linear using deuterated malachite green as an internal standard. The LODs vary for all analytes between 0.1 and 30 ppb depending on the matrix and experimental conditions. Through analyses of real samples, two chili powders and one chili oil were found to be contaminated by rhodamine B. The concentrations were comparable with those found by an HPLC-MS/MS method.<br/> ©2018 American Chemical Society.
语种:
英文
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A Proton Nuclear Magnetic Resonance (1 H NMR) Investigation of NaCl-Induced Phase Separation of Acetonitrile-Water Mixtures
作者:
Ruizhi Wen;Muqian Yu;Le Jiang;Lili Feng;Wenjie Deng;...
期刊:
美国分析化学(英文) ,2017年8(10):657-667 ISSN:2156-8251
作者机构:
[Muqian Yu; Le Jiang; Lili Feng; Wenjie Deng; Bo Chen] Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha, China;School of Sciences, Central South University of Forestry & Technology, Changsha, China;[Ruizhi Wen] Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha, China<&wdkj&>School of Sciences, Central South University of Forestry & Technology, Changsha, China
关键词:
1H NMR;NaCl;Phase Separation;Acetonitrile-Water Mixtures;Hydrogen Bond
摘要:
The microscopic properties of NaCl-induced phase separation of acetonitrile (ACN)-water mixtures have been studied by proton nuclear magnetic resonance (1H NMR). Acetonitrile-rich phase increases with increasing NaCl concentration (cNaCl) at xACN ≈ 0.25. 1H chemical shift of water for acetonitrile-rich phase rapidly decreases with decreasing NaCl mole concentration and that for water-rich phase quickly increases with increasing cNaCl. However, 1H chemical shift of acetonitrile has nothing to do with the molar concentration of NaCl, and it keeps relatively stable for all solutions (±0.002). These results reveal that Na+ and Cl- are rapidly hydrated by water, not by acetonitrile. The change of 1H chemical shift of water has shown that the number of hydrogen bond increases or hydrogen bond strengths with increasing NaCl molarity in mixtures. But hydrogen bond is broken or weaken with the temperature rising. 1H chemical shifts of pure water and the water in acetonitrile-rich phase have been investigated at 293 K, 298 K and 303 K. The hydration number of Na+ (6.05) in water-rich phase is determined by an empirical equation involving 1H chemical shift, temperature and NaCl molarity, which is in good agreement with the literatures.
语种:
中文
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Facile preparation of fluorescent gold nanocluster via polysaccharide-templated approach and its application for Cu2+ sensing
作者:
Wen, Ruizhi;Li, Hongchang;Chen, Bo* ;Wang, Liping
期刊:
Sensors and Actuators B-Chemical ,2017年248:63-70 ISSN:0925-4005
通讯作者:
Chen, Bo
作者机构:
[Li, Hongchang; Wen, Ruizhi; Chen, Bo] Hunan Normal Univ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.;[Li, Hongchang; Chen, Bo] Hunan Normal Univ, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ, Changsha 410081, Hunan, Peoples R China.;[Li, Hongchang; Wen, Ruizhi] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410081, Hunan, Peoples R China.;[Wang, Liping] Hunan Anal & Testing Ctr, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Chen, Bo] H;Hunan Normal Univ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.
关键词:
Cu 2+ sensing;Gold nanocluster;Polysaccharide;Template-based method
摘要:
In this report, we have constructed a simple, eco-friendly and one-pot synthetic strategy for the synthesis of fluorescent gold nanoclusters (GNCs) using a native polysaccharide (chondroitin sulfate) as the novel template. Moreover, we used some analytical instruments for characterizing the formation of Au clusters, containing ultraviolet-visible spectrometer, fluorescence spectrometer, high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectroscopy (XPS). The obtained data indicated that the Au nanoclusters were successfully formed. The chondroitin sulfate-capped gold nanoclusters (CS-GNCs) displayed excitation and emission bands at 450 and 520 nm, respectively. The fluorescence quantum yield was 4.78%. We further used CS-stabilized gold nanoclusters selectively and sensitively for sensing Cu<sup>2+</sup>in real samples via non-covalent d<sup>10</sup>-d<sup>10</sup>metallophilic bond. The linear range of the method was 0.01–1.8 μM with the limit of detection (LOD) was 8 nM (signal/noise = 3), and the recoveries of the spiked samples in lake water and tap water samples ranged from 90% to 108%, suggesting that the proposed method could be used in the practice detection of Cu<sup>2+</sup>. ©2017 Elsevier B.V.
语种:
英文
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Qualitative and quantitative detection of honey adulterated with high-fructose corn syrup and maltose syrup by using near-infrared spectroscopy
作者:
Li, Shuifang;Zhang, Xin;Shan, Yang* ;Su, Donglin;Ma, Qiang;...
期刊:
Food Chemistry ,2017年218:231-236 ISSN:0308-8146
通讯作者:
Shan, Yang
作者机构:
[Li, Shuifang; Ma, Qiang; Li, Jiaojuan; Wen, Ruizhi] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Zhang, Xin] Cent S Univ, Longping Branch, Grad Sch, Changsha 410125, Hunan, Peoples R China.;[Su, Donglin; Shan, Yang] Hunan Acad Agr Sci, Hunan Agr Prod Proc Inst, Changsha 410125, Hunan, Peoples R China.
通讯机构:
[Shan, Yang] H;Hunan Acad Agr Sci, Hunan Agr Prod Proc Inst, Changsha 410125, Hunan, Peoples R China.
关键词:
Competitive adaptive reweighted sampling (CARS);Honey adulteration;Near-infrared spectroscopy;Partial least squares linear discriminant analysis (PLS-LDA);Partial least squares regression (PLSR)
摘要:
Near-infrared spectroscopy (NIR) was used for qualitative and quantitative detection of honey adulterated with high-fructose corn syrup (HFCS) or maltose syrup (MS). Competitive adaptive reweighted sampling (CARS) was employed to select key variables. Partial least squares linear discriminant analysis (PLS-LDA) was adopted to classify the adulterated honey samples. The CARS-PLS-LDA models showed an accuracy of 86.3% (honey vs. adulterated honey with HFCS) and 96.1% (honey vs. adulterated honey with MS), respectively. PLS regression (PLSR) was used to predict the extent of adulteration in the honeys. The results showed that NIR combined with PLSR could not be used to quantify adulteration with HFCS, but could be used to quantify adulteration with MS: coefficient (RP) and root mean square of prediction (RMSEP) were 0.901 and 4.041 for MS-adulterated samples from different floral origins, and 0.981 and 1.786 for MS-adulterated samples from the same floral origin (Brassica spp.), respectively. (C) 2016 Published by Elsevier Ltd.
语种:
英文
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顶空固相微萃取-气相色谱-质谱联用分析柚木光辐射前后的挥发性成分
作者:
文瑞芝;曾栋;黄自知;马强;王琼;...
期刊:
林产化学与工业 ,2017年37(1):135-140 ISSN:0253-2417
通讯作者:
Hu, Y.
作者机构:
中南林业科技大学理学院, 湖南, 长沙, 410004;湖南省疾病预防控制中心, 湖南, 长沙, 410005;[文瑞芝; 黄自知; 马强; 王琼; 胡云楚] 中南林业科技大学理学院, 湖南, 长沙, 410004;[曾栋] 湖南省疾病预防控制中心, 湖南, 长沙, 410005
通讯机构:
College of Science, Central South University of Forestry & Technology, Changsha, China
关键词:
柚木;挥发性成分;光辐射;顶空固相微萃取
摘要:
采用顶空固相微萃取-气相色谱-质谱联用技术检测分析了柚木光辐射前后的挥发性成分,研究结果表明:从光辐射前后的柚木中共鉴定出80种挥发性成分,辐射前(原柚木)鉴定出57种挥发性成分,辐射60 h后的柚木中鉴定出53种挥发性成分,包括烃类、醇类、酚类、酯类、醛类、酮类、蒽醌类和胺类。光辐射后柚木未能检测到酮类,且醇类从12. 586%减少到7. 498%,醇类化合物由6种减少至3种,醛类从0. 404%增加到3. 653%,醛类化合物由3种增至5种。柚木光辐射前挥发性成分主要是2-甲基蒽醌(18. 443%) 、2-N-甲基-萘胺(14. 781%) 、邻苯二甲酸异丁基辛基酯(9. 567%) 、1,2,3-三甲基-4-丙烯基-(E)-萘(7. 513%) 、τ-杜松醇(4. 684%) 、α-杜松醇(3. 583%) 、柏木脑(3. 576%) 、1,2-邻苯二甲酸丁基异丁基酯(3. 213%)这8种化合物;辐照后除α-杜松醇和1,2-邻苯二甲酸丁基异丁基酯未能检测到外,增加了化合物1,2-邻苯二甲酸丁基环己基酯(3. 070%),且邻苯二甲酸异丁基辛基酯(11. 787%)有所增加,其余成分含量变化不大。醛类挥发性成分含有发色基团-CHO,醇类挥发性成分含有助色基团羟基-OH,而且光辐射后含量明显增加的挥发性成分都含有发色基团 -COO-,这些发色基团和助色基团的改变在柚木光变色中起到一定作用。
语种:
中文
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论分析化学实验教学中对学生数据处理能力的培养
作者:
王琼;文瑞芝;李水芳
期刊:
广东化工 ,2016年43(12):261-262 ISSN:1007-1865
作者机构:
中南林业科技大学理学院,湖南长沙,410004;[李水芳] 李水芳;[文瑞芝] 文瑞芝;[王琼] 王琼
关键词:
分析化学实验;数据处理;教学策略
摘要:
数据采集与处理是分析化学实验中的关键环节。文章从实验数据的采集、记录、处理及分析四个方面,以典型分析化学实验为例,总结了在实验教学中遇到的学生数据记录与结果处理的问题,进一步探讨了实验教师相对应的指导方案和教学策略。
语种:
中文
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浅谈有机化学实验教学改革
作者:
王琼;文瑞芝;李水芳
期刊:
长沙航空职业技术学院学报 ,2016年16(3):40-43 ISSN:1671-9654
作者机构:
中南林业科技大学理学院,湖南长沙,410018;[文瑞芝; 王琼; 李水芳] 中南林业科技大学
关键词:
有机化学实验;教学改革;能力培养
摘要:
有机化学实验对大学生化学知识和实验技能的培养有着至关重要的作用,就近年来有机化学实验教学中学生遇到的普遍问题进行总结,并提出了实验教师相对应的教改方案,以期全面提高学生的实践操作能力和创新性思维能力。
语种:
中文
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木材腐朽真菌定向降解木质素为苯系芳香类化学品
作者:
秦海蛟;付云;文瑞芝;马强;胡云楚;...
期刊:
化工进展 ,2015年(A01):173-177 ISSN:1000-6613
作者机构:
中南林业科技大学理学院,应用化学研究所,湖南 长沙 410004;[谢练武; 秦海蛟; 胡云楚; 马强; 付云; 瑞芝] 中南林业科技大学
关键词:
芳香类化学品;碱木质素;中性木质素;降解;底物依赖性
摘要:
对2种木材腐朽真菌降解木质素为一系列苯系芳香类化学品进行了初步研究,并与黄孢原毛平革菌进行了比较。从木材腐朽土壤样品中分离获得具有降解木质素活性的真菌11株,将其中活性最强的菌株ZS1与ZSH用于降解工业碱木质素与中性木质素。通过发酵条件的优化、降解产物种类与浓度的 HPLC分析,结果发现,在初始底物浓度1.0~20.0g/L变化时,ZS1对碱木质素的降解率达到40.7%,比 ZSH 的大;而 ZSH 对中性木质素的降解率为32.3%,与黄孢原毛平革菌的降解能力相当,但比 ZS1的大些。木质素能被定向降解为香草酸、苯甲酸、香草醛、苯酚、紫丁香醛、苯、对甲基苯甲醚、对甲基苯乙醚、甲苯与对二甲苯等芳香类化学品,而且不同真菌降解不同木质素的产物种类数量与浓度有所差异。这说明不同真菌对木质素的降解具有一定的底物依赖性,底物结构差异影响了降解率不同与产物种类差异,而且不同真菌降解木质素具有一定的产物定向选择性。
语种:
中文
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Metal contents in Glycine max (L.) Merr. from seven provinces of China
作者:
Wen Ruizhi;Han Yaning;Rui Yuan Yuan;Rui Yukui*
期刊:
BANGLADESH JOURNAL OF BOTANY ,2015年44(1):151-154 ISSN:0253-5416
通讯作者:
Rui Yukui
作者机构:
[Wen Ruizhi] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Rui Yukui; Han Yaning] China Agr Univ, Coll Resources & Environm Sci, Beijing, Peoples R China.;[Rui Yuan Yuan] Beijing City Univ, Dept Biol & Med, Beijing 10083, Peoples R China.;[Rui Yukui] China Agr Univ, Coll Resources & Environm Sci, Yuanmingyuan Xilu 2, Beijing, Peoples R China.
通讯机构:
[Rui Yukui] C;China Agr Univ, Coll Resources & Environm Sci, Yuanmingyuan Xilu 2, Beijing, Peoples R China.
关键词:
AAS;Black soybean (glycine max (l.) merr.);ICP-MS;Trace elements
摘要:
The black soybean (Glycine max (L.) Merr.) native to China contains rich protein, fat and vitamins. A total of 24 trace elements in black bean from Zhejiang, Heilongjiang, Hebei, Inner Mongolia, Henan, Hainan and Fujian provinces of China were determined by ICP-MS and AAS. Black beans were found to contain beneficial trace elements such as K, Mg, Ca, Zn, Fe and Mn for human health,. The heavy metal concentration in black beans are much low, which proves that black bean is a safe food. The qualities of black beans from the north provinces are higher than south provinces.
语种:
英文
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林业院校基础化学实验教学质量保障体系的探析
作者:
黄自知;胡云楚;赵莹;文瑞芝;李水芳;...
期刊:
中南林业科技大学学报(社会科学版) ,2014年8(2):152-154 ISSN:1673-9272
作者机构:
中南林业科技大学理学院,湖南长沙410004;[文瑞芝; 黄自知; 赵莹; 李姣娟; 胡云楚; 李水芳] 中南林业科技大学
关键词:
林业院校;基础化学实验;教学质量;质量保障体系
摘要:
在诠释林业院校基础化学实验教学质量保障体系内涵和当前基础化学实验教学现状基础上,提出通过构建结构合理的基础化学实验教学队伍、完善落实基础化学实验室教学管理制度、根据人才培养目标需要调整基础化学实验课程教学内容、实施开放式实验教学、构建实验教学质量监控体系等,是构建林业院校基础化学实验教学质量保障体系有效途径。
语种:
中文
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近红外光谱法定性定量检测蜂蜜中掺入甜菜糖浆的可行性研究
作者:
Li Shui-fang* ;Wen Rui-zhi;Yin Yong;Zhou Zi;Shan Yang
期刊:
光谱学与光谱分析 ,2013年33(10):2637-2641 ISSN:1000-0593
通讯作者:
Li Shui-fang
作者机构:
[Li Shui-fang; Wen Rui-zhi] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Zhou Zi; Yin Yong] Hunan Mingyuan Honey Prod Co Ltd, Changsha 410025, Hunan, Peoples R China.;[Shan Yang] Hunan Ctr Food Detect & Anal, Changsha 410025, Hunan, Peoples R China.
通讯机构:
[Li Shui-fang] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
关键词:
近红外光谱;蜂蜜;掺假;甜菜糖浆;判别分析;定量分析
摘要:
为进一步检验近红外光谱技术(NIRS)快速检测蜂蜜掺假的能力,利用近红外光谱结合化学计量学方法对蜂蜜中掺入甜菜糖浆进行了定性和定量检测。偏最小二乘-判别分析法(PLS-DA)对真假蜂蜜预测集的判别总正确率为90.2%;不同判别方法对掺假量等级预测集的判别总正确率都低于33.3%;PLS回归只对同一蜂蜜样本掺假的定量分析结果满意:预测集真实值与预测值的相关系数(r)为0.982 9,预测均方差(RMSEP)为1.394 2,而对不同植物来源和同一植物来源的不同样本的掺假量的定量分析结果不满意。研究表明,蜂蜜中掺入甜菜糖浆后,NIRS可实现真假蜂蜜的快速鉴别,而不能实现掺假量等级的鉴别及掺假量的定量分析。
语种:
中文
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Adsorption of Pb(II) on activated carbon treated by nitric acid
作者:
Tan, Xiaoyan* ;Zhao, Fang;Wen, Ruizhi;Dai, Yu
期刊:
Advanced Materials Research ,2012年550-553:2190-2193 ISSN:1022-6680
通讯作者:
Tan, Xiaoyan
作者机构:
[Dai, Yu; Tan, Xiaoyan; Zhao, Fang; Wen, Ruizhi] Cent South Univ Forestry & Technol, Inst Appl Chem, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Tan, Xiaoyan] C;Cent South Univ Forestry & Technol, Inst Appl Chem, Changsha 410004, Hunan, Peoples R China.
会议名称:
2nd International Conference on Chemical Engineering and Advanced Materials (CEAM 2012)
会议时间:
JUL 13-15, 2012
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Tan, Xiaoyan;Zhao, Fang;Wen, Ruizhi;Dai, Yu] Cent South Univ Forestry & Technol, Inst Appl Chem, Changsha 410004, Hunan, Peoples R China.
会议论文集名称:
Advanced Materials Research
关键词:
Activated carbon;Adsorption;Surface property;Wasterwater treatment
摘要:
Commercially available coal-based activated carbon was treated with different concentration of nitric acid. The resultant samples were used to adsorb lead from aqueous solution. N2 adsorption, Boehm titration, point of zero charge (pHPZC) and X-ray photoelectron spectroscopy (XPS) were used to characterize the samples. Acidic pH is favorable for Pb(Ⅱ) adsorption. The acidic groups increase significantly with the increment of the concentration of nitric acid during the treatment. The carboxylic groups of surface carbon play an important role in the adsorption process.
语种:
英文
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分散染料对苄基化改性杉木粉染色的影响
作者:
万晓巧;赵莹;文瑞芝;余泽华;刘伟
期刊:
中南林业科技大学学报 ,2012年32(1):61-65,69 ISSN:1673-923X
作者机构:
[万晓巧; 赵莹; 文瑞芝; 余泽华; 刘伟] 中南林业科技大学应用化学研究所
关键词:
苄基化木材;木材染色;分散染料;上染百分率;色差
摘要:
用6种分散染料在高温高压下对苄基化改性杉木粉进行染色,并用红外光谱分析仪和扫描电镜对其进行了微观分析。结果表明:染色苄基化杉木粉的色光与相应染料染色涤纶织物的色光较为接近,比染色原杉木粉的色光更鲜艳,色差更小,染料上染百分率高于在原杉木粉上染色的上染百分率。分散染料在苄基化杉木粉上的染色表现为物理吸附,染料分子被吸附在苄基化杉木粉表面和微孔中,并赋予苄基化杉木粉平滑的表面,使染色苄基化杉木粉呈现鲜艳的色彩和高上染百分率。
语种:
中文
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我国9省大豆主要矿物质元素含量的特征分析
作者:
文瑞芝;曾栋;袁利萍;赵莹
期刊:
湖南师范大学自然科学学报 ,2012年35(05):60-63 ISSN:2096-5281
作者机构:
中南林业科技大学理学院,中国长沙,410004;湖南省疾病预防控制中心,中国长沙,410005;中南林业科技大学材料学院,中国长沙41004
关键词:
火焰原子吸收;大豆;矿物质元素;主成分分析
摘要:
选取黑龙江、湖南、浙江等9省同一品种大豆经硝酸消解后,采用火焰原子吸收法测定了其中7种矿物质元素K、Mg、Ca、Fe、Cu、Mn、Na的含量,并运用主成分分析法对结果进行了统计分析,获得2个主成分及相应的主成分方程,详尽地解释了2个主成分的理化意义.结果表明2个主成分的数值大小与各省大豆矿物质元素含量的高低一致.用主成分分析,更能清楚反映不同省份大豆矿物质元素的含量的显著差异性,是一种分析大豆多种矿物质元素的有效方法.
语种:
中文
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