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环糊精酶改性对淀粉结构及消化特性的影响

食品与生物技术学报 2022年第11期41卷 48-56页

作者：纪杭燕金征宇食品科学与技术国家重点实验室江南大学江苏无锡214122 江南大学食品学院江苏无锡214122 江南大学食品营养与安全协同创新中心江苏无锡214122

淀粉是人类主食的主要组分和能量供应的主要来源,提升淀粉的营养品质对人体健康具有重要价值。酶法改性具有高效、专一性强和符合清洁标签等优势,是提升淀粉品质的重要手段。作者研究了环糊精葡萄糖基转移酶(Cyclodextrin glucosyltrans... 详细信息

淀粉是人类主食的主要组分和能量供应的主要来源,提升淀粉的营养品质对人体健康具有重要价值。酶法改性具有高效、专一性强和符合清洁标签等优势,是提升淀粉品质的重要手段。作者研究了环糊精葡萄糖基转移酶(Cyclodextrin glucosyltransferase,CGTase)和环糊精水解酶(Cyclodextrinase,CDase)对玉米淀粉的协同改性效果。分别采用CGTase单独添加、CGTase和CDase同时添加、CGTase和CDase顺序添加3种改性方式,并对改性后淀粉产物的结构以及消化性进行分析。结果表明,双酶改性使得产物中麦芽低聚糖比例显著提升,而对应的环糊精比例显著下降。经3种方式改性后淀粉结构发生明显解聚,DP 13~24、DP 25~36和DP> 37的链长比例下降,而DP <13的链长比例显著提升。此外,酶改性显著提升了抗性淀粉组分的含量。因此,CGTase和CDase双酶改性在提升淀粉营养品质中具有良好的应用前景。

关键词：环糊精葡萄糖基转移酶环糊精水解酶淀粉结构低聚糖淀粉消化

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Lactobacillus reuteri 1214,6-α-葡萄糖基转移酶GtfBdN改性薯类淀粉产物结构及理化特性研究

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食品与发酵工业 2021年第9期47卷 42-48页

作者：蒋彤纪杭燕柏玉香食品科学与技术国家重点实验室(江南大学) 江苏无锡214122 江南大学食品学院江苏无锡214122 江南大学食品安全与营养协同创新中心江苏无锡214122 食品安全国际联合实验室(江南大学) 江苏无锡214122

经过Lactobacillus reuteri 1214,6-α-葡萄糖基转移酶(4,6-α-glucanotransferase,4,6-α-GTase)GtfB改性淀粉可以得到一种具有益生潜力的水溶性膳食纤维。利用截断N端但高表达的全活性GtfBdN改性薯类淀粉,包括红薯淀粉、木薯淀粉和马... 详细信息

经过Lactobacillus reuteri 1214,6-α-葡萄糖基转移酶(4,6-α-glucanotransferase,4,6-α-GTase)GtfB改性淀粉可以得到一种具有益生潜力的水溶性膳食纤维。利用截断N端但高表达的全活性GtfBdN改性薯类淀粉,包括红薯淀粉、木薯淀粉和马铃薯淀粉,对产物进行结构和性质测定。通过核磁共振光谱、高效尺寸排阻色谱和高效阴离子交换色谱分析表明,GtfBdN改性分别使红薯淀粉、木薯淀粉和马铃薯淀粉中(α1→6)键比例提升至20.7%、19.5%和26.6%;产物相对分子质量减小,分子质量分布变广;聚合度>24的链段比例降低,聚合度6~12的链段比例大大增加。采用快速黏度分析仪、流变仪和差示扫描量热仪等测试发现,产物黏度大幅下降,表现出更多的流体行为,短期回生和长期回生减慢。该研究为4,6-α-GTase改性薯类淀粉在食品体系中的应用提供了理论和应用依据。

关键词： 4,6-α-葡萄糖基转移酶薯类淀粉结构分析糊化特性黏弹特性回生特性

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粘贴芳玻韧布在桥梁加固工程中的实际应用

城市道桥与防洪 2008年第8期 105-107页

作者：季杭燕浙江省义乌市市政工程管理处浙江义乌322000

芳玻韧布因其强度高、延性好、性价比高等优势,近几年在桥梁加固中应用较多。该文就芳玻韧布在桥梁加固中的实际应用进行了阐述,为该项工艺在实际应用时的施工组织提供了一些经验与操作思路。

关键词：芳玻韧布桥梁加固施工组织义乌南门大桥

Light People: Professor Fanglin Bao and his cover story

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Light(Science & Applications) 2024年第6期13卷 1015-1020页

作者： ji Wang School of Science Westlake UniversityHangzhouZhejiangPR China

Qu Yuan,a renowned ancient Chinese poet,once pondered in his work Heavenly Inquiry:“If the sun’s light is absent,from where does the radiance of the Hero Flower emanate?”The ability to see clearly in the darkest of nights has long been a sought-after magical power by *** holds not only immense technological significance for computer vision and remote sensing but also profound implications for transcending the dichotomy between day and night in our daily *** Fanglin Bao from Westlake University has made significant breakthroughs in this field,bringing us closer to a world where we can transform night into *** groundbreaking research on Heat-Assisted Detection and Ranging(HADAR)and night vision was featured as the cover story in Nature on July 26,2023.

关键词： bringing breakthrough holds

Trend of Developing Aqueous Liquid and Gel Electrolytes for Sustainable,Safe,and High‑Performance Li‑Ion Batteries

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Nano-Micro Letters 2024年第1期16卷 17-34页

作者： Donghwan ji Jaeyun Kim School of Chemical Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences&Technology(SAIHST)Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Biomedical Institute for Convergence at SKKU(BICS) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Institute of Quantum Biophysics(IQB) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Present Address:Department of NanoEngineering University of California San DiegoLa JollaSan DiegoCA 92093USA

Current lithium-ion batteries(LIBs)rely on organic liquid electrolytes that pose significant risks due to their flammability and *** potential for environmental pollution and explosions resulting from battery damage or fracture is a critical ***-based(aqueous)electrolytes have been receiving attention as an alternative to organic ***,a narrow electrochemicalstability window,water decomposition,and the consequent low battery operating voltage and energy density hinder the practical use of aqueous ***,developing novel aqueous electrolytes for sustainable,safe,high-performance LIBs remains *** Review first commences by summarizing the roles and requirements of electrolytes–separators and then delineates the progression of aqueous electrolytes for LIBs,encompassing aqueous liquid and gel electrolyte development trends along with detailed principles of the *** aqueous electrolytes are progressed based on strategies using superconcentrated salts,concentrated diluents,polymer additives,polymer networks,and artificial passivation layers,which are used for suppressing water decomposition and widening the electrochemical stability window of water of the *** addition,this Review discusses potential strategies for the implementation of aqueous Li-metal batteries with improved electrolyte–electrode interfaces.A comprehensive understanding of each strategy in the aqueous system will assist in the design of an aqueous electrolyte and the development of sustainable and safe high-performance batteries.

关键词： Lithium-ion battery(LIB) Aqueous electrolyte Gel electrolyte Electrochemical stability window Li dendrite

Photocatalytic activation of sulfite by N-doped porous biochar/MnFe_(2)O_(4) interface-driven catalyst for efficient degradation of tetracycline

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Green Energy & Environment 2024年第3期9卷 481-494页

作者： Long Cheng Yuanhui ji jiangsu Province Hi-Tech Key Laboratory for Biomedical Research School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China

A novel photo-catalytic system composed of N-doped biochars(NBCs),MnFe_(2)O_(4) and sulfite activation under ultraviolet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constructed to realize the efficient eliminate of tetracycline(TC).As the carrier of MnFe_(2)O_(4),NBCs were synthesized from alfalfa,which has large specific surface area,graphite like structure and hierarchical porous *** adsorption isotherm indicated that NBCs/MnFe_(2)O_(4)-2:1 had the best adsorption performance for TC(347.56 mg g^(-1)).Through synergistic adsorption and photocatalysis,the removal rate of TC reached 84%,which was significantly higher than that of MnFe_(2)O_(4).Electrochemical impedance spectroscopy(EIS)and Photoluminescence(PL)characterization results showed that the introduction of NBCs improved the separation efficiency of photogenerated electron and hole pairs and enhanced the photocatalytic ***,the adsorption,degradation mechanism and degradation path of TC by the catalyst were systematically analyzed by coupling HPLC–MS measurement with the theoretical *** the advantages of excellent degradation performance,low cost,easy separation and environmental friendliness of NBCs/MnFe_(2)O_(4),this work was expected to provide a new path for the practical application of biochar.

关键词： Biochar MnFe_(2)O_(4) Sulfite Adsorption Photocatalysis

Boosting electrocatalytic nitrate reduction to ammonia via Cu_(2)O/Cu(OH)_(2)heterostructures promoting electron transfer

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Nano Research 2024年第6期17卷 4898-4907页

作者： jing Geng Sihan ji Anhui Province International Research Center on Advanced Building Materials School of Materials Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China Anhui Province Key Laboratory of Advanced Building Materials Anhui Jianzhu UniversityHefei 230601China School of Energy Materials and Chemical Engineering Hefei UniversityHefei 230601China

Electrocatalytic nitrate(NO_(3)^(−))reduction to ammonia(NH_(3))offers a viable approach for sustainable NH_(3)production and environmental ***(Cu)possesses a distinctive electronic structure,which can augment the reaction kinetics of NO_(3)^(−)and impede hydrogen evolution reaction(HER),rendering it a promising contender for the electrosynthesis of NH_(3)from NO_(3)^(−).Nevertheless,the role of Cu_(2)O in copper-based catalysts still requires further investigation for a more comprehensive ***,the Cu_(2)O/Cu(OH)_(2)heterostructures are successfully fabricated through liquid laser irradiation using CuO nanoparticles as a *** and theoretical researches reveal that Cu_(2)O/Cu(OH)_(2)heterostructure exhibits enhanced electrocatalytic performance for NO_(3)^(−)to NH_(3)because Cu(OH)_(2)promotes electron transfer and reduces the valence state of Cu active site in Cu_(2)***−0.6 V(*** hydrogen electrode(RHE)),the NH_(3)yield reaches its maximum at 1630.66±29.72μg·h^(−1)·mgcat^(−1),while the maximum of Faraday efficiency(FE)is 76.95%±5.51%.This study expands the technical scope of copper-based catalyst preparation and enhances the understanding of the electrocatalytic mechanism of NO_(3)^(−)to NH_(3).

关键词： Cu_(2)O/Cu(OH)_(2)heterostructures electron transfer ammonia synthesis electrocatalysts nitrate

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酶法制备低热量淀粉及其衍生物的研究进展

食品与生物技术学报 2022年第11期41卷 31-39页

作者：陈园荟纪杭燕邱超龙杰陈龙徐振林金征宇江南大学食品学院江苏无锡214122 食品科学与技术国家重点实验室江南大学江苏无锡214122 华南农业大学食品学院广东广州510642

近年来,随着慢性病患病人数逐年增加,患病人群趋于年轻化,越来越多的人意识到健康饮食是一种预防和辅助治疗慢性病的有效手段。低热量淀粉及其衍生物因具有降低血糖血脂、改善肠道环境、促进微量元素吸收、抗消化性等功能,在食品、医药... 详细信息

近年来,随着慢性病患病人数逐年增加,患病人群趋于年轻化,越来越多的人意识到健康饮食是一种预防和辅助治疗慢性病的有效手段。低热量淀粉及其衍生物因具有降低血糖血脂、改善肠道环境、促进微量元素吸收、抗消化性等功能,在食品、医药等行业的应用越来越广泛。目前,酶法制备低热量淀粉及其衍生物已经成为一种安全、绿色、健康、高效的方法。作者概述了酶法制备低热量淀粉及其衍生物的关键酶、关键技术、功能应用等,为未来制备工艺的优化以及产品的应用提供参考。

关键词：酶法制备低热量淀粉环糊精抗性糊精

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Small Cycles Property of Some Cremer Rational Maps and Polynomials

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Chinese Annals of Mathematics,Series B 2024年第1期45卷 123-136页

作者： Rong FU ji ZHOU Faculty of Science Yibin UniversityYibin 644000SichuanChina Department of Mathematical Sciences Sichuan Normal UniversityChengdu 610066China

This paper concerns the linearization problem on rational maps of degree d≥2 and polynomials of degree d>2 from the perspective of *** authors introduce a set l_(∞) of irrational numbers and show that if α∈l_(∞),then any rational map is not linearizable and has infinitely many cycles in every neighborhood of the fixed point with multiplier λ=e^(2πiα),Adding more constraints to cubic polynomials,they discuss the above problems by polynomial-like *** the family of polynomials,with the help of Yoccoz's method,they obtain its maximum dimension of the set in which the polynomials are non-linearizable.

关键词： Irrationally indifferent fixed point Linearization problem Small cycles property