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Biological Evaluation of Lysionotin:a Novel Inhibitor of 5-lipoxygenase for Anti-glioma

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Chinese Journal of Integrative Medicine 2024年第9期30卷 826-834页

作者： SHAO Xin-xin CHEN Cong liU jie li qing-jun HE Shan QI Xiang-hua FU Xian-jun wang Zhen-guo The First Clinical College of Medicine Shandong University of Traditional Chinese MedicineJinan250355China Institute for literature and Culture of Chinese Medicine Shandong University of Traditional Chinese MedicineJinan250355China Key Laboratory of Classical Theory of Traditional Chinese Medicine Ministry of EducationShandong University of Traditional Chinese MedicineJinan250355China College of Pharmacy Shandong University of Traditional Chinese MedicineJinan250355China Experimental Center Shandong University of Traditional Chinese MedicineJinan250355China Neurology Department Affiliated Hospital of Shandong University of Traditional Chinese MedicineJinan250014China Marine Traditional Chinese Medicine Research Center Qingdao Academy of Traditional Chinese MedicineShandong University of Traditional Chinese MedicineQingdao266114Shandong ProvinceChina

Objective:To explore the potential mechanism of lysionotin in treating ***:First,target prediction based on Bernoulli Naïve Bayes profiling and pathway enrichment was used to predict the biological activity of *** binding between 5-lipoxygenase(5-LO)and lysionotin was detected by surface plasmon resonance(SPR)and molecular docking,and the inhibitory effects of lysionotin on 5-LO and proliferation of glioma were determined using enzyme inhibition assay in vitro and cell viability analysis,***,the pharmaceutical effect of lysionotin was explored by cell survival rate analysis and liquid chromatography with tandem mass spectrometry(LC-MS/MS).The protein expression,intracellular calcium ion concentration and cytoskeleton detection were revealed by Western blot,flow cytometry and fluorescence labeling,***:Target prediction and pathway enrichment revealed that lysionotin inhibited 5-LO,a key enzyme involved in the arachidonic acid metabolism pathway,to inhibit the proliferation of *** docking results demonstrated that 5-LO can be binding to lysionotin through hydrogen bonds,forming bonds with His600,Gln557,Asn554,and *** analysis further confirmed the interaction between 5-LO and ***,enzyme inhibition assay in vitro and cell survival rate analysis revealed that 50%inhibition concentration of lysionotin and the median effective concentration of lysionotin were 90 and 16.58µmol/L,respectively,and the results of LC-MS/MS showed that lysionotin inhibited the production of 5S-hydroperoxy-eicosatetraenoic acid(Plioma cells well(P<0.01)and inhibit their *** blot analysis demonstrated that lysionotin can inhibit the expression of 5-LO(P<0.05)and downstream leukotriene B4 receptor(P<0.01).In addition,the results showed that lysionotin affected intracellular calcium ion concentration by inh

关键词： 5-lipoxygenase inhibitor lysionotin 5-lipoxygenase leukotriene B4 calcium ion cytoskeleton

A N-CoSe/CoSe_(2)-C@Cu hierarchical architecture as a current collector-integrated anode for potassium-ion batteries

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Rare Metals 2024年第8期43卷 3702-3712页

作者： Zi-jie Mu Yan-jun Gao Wen-Shuai Dong Zong-You li qing-Yi Song Han-Jiao Huang li-Dong Xing Jian-guo Zhang Wei wang Qi-Yao Yu State Key Laboratory of Explosion Science and Technology School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The highly reversible insertion/extraction of large-radius K^+into electrode materials remains a tough goal,especially for con version-type ***,we design a current collector-integrated electrode(N-CoSe/CoSe_(2)-C@Cu) as an advanced anode for potassium-ion battery(PIBs).The conductive CoSe/CoSe_(2) heterojunction with rich Se vacancy defects,conductive sp^2 N-doped carbon layer,and the elastic copper foil matrix can greatly accelerate the electron transfer and enhance the structural ***,the well-designed N-CoSe/CoSe_(2)-C@Cu current collector-integrated electrode displays enhanced potassium storage performance with regard to a high capacity(325.1 mAh·g^(-1) at 0.1 A·g^(-1) after 200cycles),an exceptional rate capability(223.5 mAh·g^(-1) at2000 mA·g^(-1)),and an extraordinary long-term cycle stability(a capacity fading of only 0.019% per cycle over1200 cycles at 2000 mA·g^(-1)).Impressively,ex situ scanning electron microscopy(SEM) characterizations prove that the elastic structure of copper foil is merged into the cleverly designed N-CoSe/CoSe_(2)-C@Cu heterostructure,which buffers the deformation of structure and volume and greatly promotes the cycle life during the potassium/depotassium process.

关键词： Potassium-ion battery Integrated collector electrode CoSe CoSe_2 Heterojunction Copper foil matrix N-doped carbon

Combined ATAC-seq,RNA-seq,and GWAS analysis reveals glycogen metabolism regulatory network in Jinjiang oyster(Crassostrea ariakensis)

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Zoological Research 2024年第1期45卷 201-214页

作者： Biao Wu Xi Chen jie Hu Zhen-Yuan wang Yan wang Da-You Xu Hao-Bing guo Chang-Wei Shao li-qing Zhou Xiu-jun Sun Tao Yu Xiao-Mei wang Yan-Xin Zheng Guang-Yi Fan Zhi-hong liu State Key Laboratory of Mariculture Biobreeding and Sustainable Goods Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdaoShandong 266071China Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdaoShandong 266071China BGI-qingdao BGI-ShenzhenQingdaoShandong 266426China National Demonstration Center for Experimental Fisheries Science Education Shanghai Ocean UniversityShanghai 201306China Changdao Enhancement and Experiment Station Chinese Academy of Fishery SciencesYantaiShandong 265800China State Key Laboratory of Agricultural Genomics BGI-ShenzhenShenzhenGuangdong 518083China

Glycogen serves as the principal energy reserve for metabolic processes in aquatic shellfish and substantially contributes to the flavor and quality of *** Jinjiang oyster(Crassostrea ariakensis)is an economically and ecologically important species in *** the present study,RNA sequencing(RNA-seq)and assay for transposase-accessible chromatin using sequencing(ATAC-seq)were performed to investigate gene expression and chromatin accessibility variations in oysters with different glycogen *** identified 9483 differentially expressed genes(DEGs)and 7215 genes with significantly differential chromatin accessibility(DCAGs)were obtained,with an overlap of 2600 genes between ***,a significant proportion of these genes were enriched in pathways related to glycogen metabolism,including“Glycogen metabolic process”and“Starch and sucrose metabolism”.In addition,genome-wide association study(GWAS)identified 526 single nucleotide polymorphism(SNP)loci associated with glycogen *** loci corresponded to 241 genes,63 of which were categorized as both DEGs and *** study enriches basic research data and provides insights into the molecular mechanisms underlying the regulation of glycogen metabolism in ***.

关键词： Crassostrea ariakensis Glycogen Transcriptome ATAC GWAS

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang li li‑Jiao wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑jun Ning Kai Pan Wei Xu Tao li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑qing Feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑jie Han guo‑Zhu He Yong‑Cheng He Yang hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑jie Jiang Zheng‑Yao Jin ling Kang Bo li Gong li Xiao li Yang li jie liu Rong liu Shu‑Bin liu Yi‑Na liu Guang‑Yuan Luan jie ren Zhi‑Zhou ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng wang Peng‑Cheng wang Zhao‑Hui wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu guo‑Hui Zhang Hang‑Chang Zhang lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑jun Zhu chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

Study of the response of 10B-doped MCP to wide-energy range neutrons from eV to MeV

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Nuclear Science and Techniques 2024年第8期35卷 132-141页

作者： Qiang li li‑Jiao wang Xiang‑Biao Qiu Jing‑Wen li Wei Xu Tao li Ze‑Bin lin Chang‑jun Ning Yong‑Hao Chen Rui‑Rui Fan Kang Sun Jing‑Yu Tang Rong Zhang Han‑Tao Jing Bo Mei Qi An Hao‑Fan Bai Jiang‑Bo Bai jie Bao Ping Cao Qi‑Ping Chen Zhen Chen Zeng‑Qi Cui An‑Chuan Fan Chang‑qing Feng Fan‑Zhen Feng Ke‑qing Gao Min‑Hao Gu Chang‑Cai Han Zi‑jie Han guo‑Zhu He Yong‑Cheng He Yang hong Yi‑Wei Hu Han‑Xiong Huang Wei‑Hua Jia Hao‑Yu Jiang Wei Jiang Zhi‑jie Jiang Zheng‑Yao Jin ling Kang Bo li Chao li Gong li Jia‑Wen li Xiao li Yang li jie liu Rong liu Shu‑Bin liu Guang‑Yuan Luan Bin‑Bin Qi jie ren Zhi‑Zhou ren Xi‑Chao Ruan Zhao‑Hui Song Zhi‑Xin Tan Sheng‑Da Tang Peng‑Cheng wang Zhao‑Hui wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu li‑Kun Xie Yi‑Wei Yang Han Yi Yong‑Ji Yu guo‑Hui Zhang lin‑Hao Zhang Mo‑Han Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑liang Zhang Yue Zhang Zhi‑Yong Zhang Mao‑Yuan Zhao Lu‑Ping Zhou Zhi‑Hao Zhou Ke‑jun Zhu Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China North Night Vision Science&Technology(Nanjing)Research Institute Co.Ltd. Nanjing 211106China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Neutron-sensitive microchannel plates(nMCPs)have applications in neutron detection,including energy spectrum measurements,neutron-induced cross sections,and neutron imaging.10B-doped MCPs(B-MCPs)have attracted significant attention owing to their potential for exhibiting a high neutron detection efficiency over a large neutron energy *** spatial and temporal resolutions are useful for neutron energy-resolved ***,their practical applications still face many technical *** this study,a B-MCP with 10 mol%10B was tested for its response to wide-energy neutrons from eV to MeV at the Back-n white neutron source at the China Spallation Neutron *** neutron detection efficiency was calibrated at 1 eV,which is approximately 300 times that of an ordinary MCP and indicates the success of 10 B *** factors that caused the reduction in the detection efficiency were simulated and *** neutron energy spectrum obtained using B-MCP was compared with that obtained by other measurement methods,and showed very good consistency for neutron energies below tens of *** response is more complicated at higher neutron energy,at which point the elastic and nonelastic reactions of all nuclides of B-MCP gradually become *** is beneficial for the detection of neutrons,as it compensates for the detection efficiency of B-MCP for high-energy neutrons.

关键词： Neutron radiation image 10B-doped MCP Neutron response Wide-energy range neutrons

Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang Yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang li Gong li Dong liu Zheng-Yao Jin Xing-Zhu Cui Tian-Xiang Chen Yi-Wei Yang Rong liu Han Yi Yang li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-qing Feng Fan-Zhen Feng Ke-qing Gao Min-Hao Gu Chang-Cai Han Zi-jie Han guo-Zhu He Yong-Cheng He Yang hong Yi-Wei Hu Han-Xiong Huang Wei-Hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang ling Kang Bo li Chao li Jia-Wen li Xiao li jie liu Shu-Bin liu Guang-Yuan Luan Chang-jun Ning Bin-Bin Qi jie ren Zhi-Zhou ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Xin Tan li-Jiao wang Peng-Cheng wang Zhao-Hui wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu li-Kun Xie Yong-Ji Yu guo-Hui Zhang lin-Hao Zhang Mo-Han Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-liang Zhang Yue Zhang Zhi-Yong Zhang Mao-Yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-jun Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the China Spallation Neutron Source(CSNS)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

Effectiveness and safety of early lens extraction during par plana vitrectomy for proliferative diabetes retinopathy with mild cataract:a randomized clinical trial

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International Journal of Ophthalmology(English edition) 2024年第3期17卷 528-536页

作者： Wei-Bo Feng Lei Zheng Ying-Qi li Yong-Hao li guo-Ming Zhang Xian wang Bing-Qian liu ling Jin Yi-Nuo Huang Yang-Fan Yang Zi-Dong Chen Da-Hui Ma qing-Shan Chen Chao-jun Qin Bing-Min Feng Zhu-Min Yang Xing Huang Cheng-jie Yang Sheng-Hui liu Ming-Xing Wu State Key Laboratory of Ophthalmology Guangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangdong Provincial Clinical Research Center for Ocular DiseasesZhongshan Ophthalmic CenterSun Yat-sen UniversityGuangzhou 510275Guangdong ProvinceChina Shenzhen Eye Hospital Affiliated to Jinan University Shenzhen 518040Guangdong ProvinceChina The Affiliated Hospital of Guizhou Medical University Guiyang 550004Guizhou ProvinceChina Guangzhou Aier Eye Hospital Guangzhou 510000Guangdong ProvinceChina

●AIM:To evaluate the effectiveness and safety of early lens extraction during pars plana vitrectomy(PPV)for proliferative diabetic retinopathy(PDR)compared to those of PPV with subsequent cataract surgery.●METHODS:This multicenter randomized controlled trial was conducted in three Chinese hospitals on patients with PDR,aged>45y,with mild *** participants were randomly assigned to the combined(PPV combined with simultaneously cataract surgery,i.e.,phacovitrectomy)or subsequent(PPV with subsequent cataract surgery 6mo later)group and followed up for *** primary outcome was the change in best-corrected visual acuity(BCVA)from baseline to 6mo,and the secondary outcomes included complication rates and medical expenses.●RESULTS:In total,129 patients with PDR were recruited and equally randomized(66 and 63 in the combined and subsequent groups respectively).The change in BCVA in the combined group[mean,36.90 letters;95%confidence interval(CI),30.35–43.45]was significantly better(adjusted difference,16.43;95%CI,8.77–24.08;Prence between the two groups at *** overall surgical risk of two sequential surgeries was significantly higher than that of the combined surgery for neovascular glaucoma(17.65%vs 3.77%,P=0.005).No significant differences were found in the photocoagulation spots,surgical time,and economic expenses between two *** the subsequent group,the duration of work incapacity(22.54±9.11d)was significantly longer(P<0.001)than that of the combined group(12.44±6.48d).●CONCLUSION:PDR patients aged over 45y with mild cataract can also benefit from early lens extraction during PPV with gratifying effectiveness,safety and convenience,compared to sequential surgeries.

关键词： lens extraction pars plana vitrectomy proliferative diabetic retinopathy cataract simultaneously operations

基于STL-Informer-ARIMA组合模型的猪肉价格预测方法研究

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山东农业大学学报（自然科学版） 2024年第3期55卷 367-375页

作者：王杰董国奥李俊清山东农业大学信息科学与工程学院山东泰安271018 山东农业大学农业大数据研究中心山东泰安271018

合理预测猪肉价格对稳定生猪市场价格波动及促进猪产业的健康持续发展具有重要意义。本文深入研究了猪肉价格的影响因素,整合了29种相关价格数据。通过分析数据特征,针对Informer模型在猪肉价格数据提取方面的局限性,对Informer模型进... 详细信息

合理预测猪肉价格对稳定生猪市场价格波动及促进猪产业的健康持续发展具有重要意义。本文深入研究了猪肉价格的影响因素,整合了29种相关价格数据。通过分析数据特征,针对Informer模型在猪肉价格数据提取方面的局限性,对Informer模型进行改进,将自注意力机制ProbAttention更换为Synthesizer模型,引入了价格波动模块。在此基础上,本文提出了一种新的价格预测组合模型STL-Informer-ARIMA,模型结合了随机森林(Random Forest)和递归特征消除(Recursive Feature Elimination)进行特征选择,利用季节性和趋势分解法(Seasonal and Trend Decomposition Using Loess)对猪肉(白条猪)价格进行分解,采用ARIMA模型对季节项进行预测,同时针对趋势项和残差项采用改进的Informer模型进行预测。实验表明,STL-Informer-ARIMA组合模型的MSE为0.532,MAE为0.446,RMSE为0.729,MAPE为0.030,R^(2)为0.958,相较于LSTM、SVR和GRU等常用价格预测模型,本文的组合模型有效提升了猪肉价格预测的准确性和可靠性。

关键词：猪肉价格特征选择改进的Informer 组合模型

以Hailwood-Horrobin平衡水分模型分析聚葡萄糖吸潮机理

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粮油食品科技 2024年第3期32卷 140-147页

作者：刘畅王梦雅宋洪东曹子怡颉宇李兴军宁国庆上海理工大学健康科学与工程学院上海200093 国家粮食和物资储备局科学研究院粮食储运研究所北京100037 国家粮食储运工程研究中心北京100037 人良生物科技(上海)有限公司上海201800

为解释聚葡萄糖的吸潮性能,改进包装材料,在20~35℃和平衡相对湿度(ERH)10%~90%范围内,测定了初始含水率(IMC)1.01%~4.89%的5个国产样品(a1~a5)的水分吸附与解吸等温线。吸附和解吸等温线均是S型曲线,在ERH小于80%时,解吸等温线与吸附... 详细信息

为解释聚葡萄糖的吸潮性能,改进包装材料,在20~35℃和平衡相对湿度(ERH)10%~90%范围内,测定了初始含水率(IMC)1.01%~4.89%的5个国产样品(a1~a5)的水分吸附与解吸等温线。吸附和解吸等温线均是S型曲线,在ERH小于80%时,解吸等温线与吸附等温线之间存在滞后现象,样品初始含水率越低,滞后现象越显著。由于聚葡萄糖是无定形相态的粉末,我们假定聚葡萄糖水分吸附过程是蒸汽相态、液体相态(多分子层吸附)及固体溶液(单分子层吸附)之间存在的平衡,按照Hailwood-Horrobin(HH)模型把S型吸附等温线去卷积为单分子层(Mh)和多分子层成分(Md),吸附和解吸多分子层水含量随ERH增加呈现S型曲线增加,解吸单分子层含水率随ERH增加保持不变,而吸附单分子层含水率随ERH增加对a1~a4样品(IMC4.87%~2.35%)缓慢增加,对a5样品(IMC 1.01%)几乎线性减少。随着样品初始含水率降低,吸附位点聚合物分子量对a1样品最大,对a5样品最小。尽管红外光谱扫描显示a5样品羟基(3416cm^(–1))和无定形结构官能团(1027cm^(–1))的强度最小,但是a5样品的吸潮率最大。说明不同工艺加工的聚葡萄糖样品含水率越低,吸附单分子层水含量随ERH增加几乎线性减少,但是吸附多分子层含水量随ERH增加是S型增加,吸潮率和吸湿量增大。

关键词：聚葡萄糖水分吸着等温线吸潮率单分子层吸附滞后环