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荔枝果实不同部位提取物的总黄酮含量及其稳定性、抗氧化、美白活性分析
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作者 刘展眉 邹启文 +3 位作者 张汉辉 李俊杰 程杏安 蒋旭红 《食品安全质量检测学报》 CAS 2024年第11期274-283,共10页
目的探究荔枝果实不同部位多酚提取物(果肉、鲜干果核、鲜干果壳)中总黄酮含量及其稳定性、抗氧化及美白活性。方法通过亚硝酸钠显色法测定荔枝果实不同部位多酚提取物中的黄酮类物质含量,并以紫外分光光度法测定其对1,1-二苯基-2-苦基... 目的探究荔枝果实不同部位多酚提取物(果肉、鲜干果核、鲜干果壳)中总黄酮含量及其稳定性、抗氧化及美白活性。方法通过亚硝酸钠显色法测定荔枝果实不同部位多酚提取物中的黄酮类物质含量,并以紫外分光光度法测定其对1,1-二苯基-2-苦基肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基的清除能力、稳定性(温度、pH及光照)及对酪氨酸酶的抑制活性。结果荔枝果实不同部位多酚提取物中均有较高的总黄酮含量,其中荔枝果肉多酚中黄酮占比最高为93.24%;其DPPH自由基抗氧化活性顺序是:荔枝果肉>鲜荔枝核>干荔枝核>鲜荔枝壳>干荔枝壳;对酪氨酸酶抑制能力分别是:荔枝果肉>干荔枝核>鲜荔枝核>鲜荔枝壳>干荔枝壳,其中荔枝果肉与干荔枝核的半抑制浓度(half maximal inhibitory concentration,IC50)分别为0.197与0.241,均优于熊果苷(IC50为0.343)。在同等温度、pH、自然光条件下,荔枝果实总黄酮稳定性顺序分别是:干荔枝壳>干荔枝核>鲜荔枝壳>鲜荔枝核>荔枝果肉。结论荔枝果实不同部位多酚提取物均具有一定DPPH抗氧化活性、稳定性与酪氨酸酶抑制活性,且其DPPH抗氧化活性和酪氨酸酶抑制活性均与其总黄酮含量和成分相关。荔枝果肉和荔枝壳、荔枝核等废弃物均可成为天然抗氧化剂与美白成分的原料来源,为拓展荔枝果实在食品及日化行业的应用提供参考。 展开更多
关键词 荔枝果实 总黄酮 抗氧化活性 酪氨酸酶活性
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多钒硼酸盐H_(3){[Cu(en)_(2)]_(5)[(VO)_(12)O_(6)B_(18)O_(42)]}[B(OH)_(3)]_(2)·16H_(2)O的水热合成、晶体结构和性质 被引量:5
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作者 林志华 张汉辉 +3 位作者 黄长沧 孙瑞卿 陈义平 吴小园 《化学学报》 SCIE CAS CSCD 北大核心 2004年第4期391-398,共8页
用H_(3)BO_(3),NH_(4)VO_(3),Cu(CH_(3)COO)_(2)·H_(2)O和乙二胺在水热条件下合成了新颖结构的多钒硼酸盐H_(3){[Cu(en)_(2)]_(5)[(VO)_(12)O_(6)B_(18)O_(42)]}[B(OH)_(3)]_(2)·16H_(2)O,对其进行了单晶X射线衍射、红外光谱... 用H_(3)BO_(3),NH_(4)VO_(3),Cu(CH_(3)COO)_(2)·H_(2)O和乙二胺在水热条件下合成了新颖结构的多钒硼酸盐H_(3){[Cu(en)_(2)]_(5)[(VO)_(12)O_(6)B_(18)O_(42)]}[B(OH)_(3)]_(2)·16H_(2)O,对其进行了单晶X射线衍射、红外光谱、拉曼光谱、紫外-可见漫反射光谱、荧光光谱、顺磁共振谱和热重分析表征.在该化合物的结构中,环状的B18O42通过18个B—(μ_(3)O)—V键被两个V6O18簇夹在中间,簇阴离子[(VO)_(12)O_(6)B_(18)O_(42)]^(13-)分别通过4个[Cu(en)_(2)]^(2+)与邻近的簇阴离子靠静电相互作用连接成无限二维网状结构,其空洞尺寸为0619~1817nm. 展开更多
关键词 水热合成 多钒硼酸盐 晶体结构 簇合物
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H_(10)[NiMo^(Ⅴ)_(12)O_(40){Ni(H_(2)O)_(3)}_(4)]的水热合成和晶体结构
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作者 林志华 张汉辉 +2 位作者 黄长沧 孙瑞卿 吴小园 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2003年第2期207-210,共4页
在水热的条件下合成了1个标题的Mo-Ni-O异核簇合物,化学式为H_(34)Ni_(5)Mo_(12)O_(52)(Mr=2311.10),用单晶X射线衍射方法测定了它的结构,该晶体属四方晶系,I41/amd空间群,晶胞参数为a=15.319(2),c=30.645(3),V=7191.2(16)3,Z=4,Dc=2.13... 在水热的条件下合成了1个标题的Mo-Ni-O异核簇合物,化学式为H_(34)Ni_(5)Mo_(12)O_(52)(Mr=2311.10),用单晶X射线衍射方法测定了它的结构,该晶体属四方晶系,I41/amd空间群,晶胞参数为a=15.319(2),c=30.645(3),V=7191.2(16)3,Z=4,Dc=2.135 g/cm^(3),μ=3.369 mm^(-1),F(000)=4376,1036个可观察衍射点(I>2s(I)),最终结构偏离因子R=0.0560,wR=0.1632,S=1.002。该化合物簇阴离子笼中心是Ni^(2+),由12个MoO_(6)八面体和4个NiO_(6)八面体通过共角和共边构成。 展开更多
关键词 水热合成 钼氧簇合物 晶体结构 KEGGIN结构
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木犀草素分子印迹固相萃取柱的制备及应用 被引量:1
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作者 刘展眉 张汉辉 +3 位作者 东方云 肖裕泽 程杏安 蒋旭红 《食品研究与开发》 CAS 北大核心 2021年第16期92-98,共7页
以木犀草素为模板分子,α-甲基丙烯酸(α-methyl acrylic acid,MAA)为功能单体,乙二醇二甲基丙烯酸酯(ethylene glycol dimethacrylate,EGDMA)为交联剂,通过沉淀聚合法制备木犀草素分子印迹聚合物;并以其为固相萃取柱填料,制备木犀草素... 以木犀草素为模板分子,α-甲基丙烯酸(α-methyl acrylic acid,MAA)为功能单体,乙二醇二甲基丙烯酸酯(ethylene glycol dimethacrylate,EGDMA)为交联剂,通过沉淀聚合法制备木犀草素分子印迹聚合物;并以其为固相萃取柱填料,制备木犀草素分子印迹固相萃取柱,确定该固相萃取柱的最佳吸附条件;用此固相萃取柱对花生壳粗提物中的木犀草素进行分离纯化。结果表明,该固相萃取柱对木犀草素表现出较好的特异性吸附效果,可分离纯化出相对纯度为94.18%的木犀草素。 展开更多
关键词 木犀草素 沉淀聚合法 分子印迹聚合物 固相萃取
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Estimate of Methane Emission from Rice Paddy Fieldsin Taihn Region, China 被引量:22
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作者 CAI ZU-CONG XU HUA +1 位作者 zhang han-hui and JIN JI-SHENG(Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 ( China)Agricultural Extension Station of Wuxian County, Suzhou 215007 (China)) 《Pedosphere》 SCIE CAS CSCD 1994年第4期297-306,共10页
Methane fluxes from late rice and single cropping rice fields in Taihu region were measured using closedchamber method in 1992 and 1993 and CH_4 emission from this region (total area of paddy soils was about1.88 milli... Methane fluxes from late rice and single cropping rice fields in Taihu region were measured using closedchamber method in 1992 and 1993 and CH_4 emission from this region (total area of paddy soils was about1.88 million hectares, of which 0.63 million hectares are distributed in the south of Jiangsu Province) wasestimated on the basis of the mean CH_4 fluxes observed. The results showed that the mean CH_4 flaxes fromlate rice and single cropping rice field were quite similar under the prevailing cultivation practices in theregion, being around 5 mg CH_4/m ̄2/h (4.31-5.31 mg CH_4/m ̄2/h for various cultivars of the late rice and3.20-6.22 mg CH_4/m ̄2/h for various treatments of the single cropping rice). Total CH_4 emission from paddysoils in the region was estimated to be 0.185-0.359 Tg CH_4 per year. Continuously flooding the soil witha water layer till ripening caused higher mean CH_4 flux; and addition of nitrification inhibitor (thiourea)stimulated CH_4 emission. There was no simple relationship between CH_4 flux and either soil temperature orsoil Eh. 展开更多
关键词 METHANE paddy soils Taihu region
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Synthesis and Characterization of Two New Organically Templated Open-framework Uranium Phosphites 被引量:1
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作者 XU Jian-Fu LI Hao-Hong +5 位作者 CAO Yan-Ning HUANG Chang-Cang zhang han-hui LIU Dong-Sheng YANG Qi-Yu SUN Rui-Qing 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2006年第11期1380-1386,共7页
Two organically templated uranium phosphites, (C4H12N)(UO2)(HPO3)(NO3) (Mr = 486.16) 1 and (C16H36N)2(UO2)2(H2PO3)2(HPO3)(NO3)2 (Mr= 1390.95) 2, were prepared by evaporation from aqueous solution... Two organically templated uranium phosphites, (C4H12N)(UO2)(HPO3)(NO3) (Mr = 486.16) 1 and (C16H36N)2(UO2)2(H2PO3)2(HPO3)(NO3)2 (Mr= 1390.95) 2, were prepared by evaporation from aqueous solution of uranyl nitrate, phosphite acid and their respective organic ammonium hydroxids. Their structures were determined by single-crystal X-ray diffraction and further characterized by infrared and fluorescence spectroscopy. In 1, pentagonal [UO7] bipyramids share comers with three [HPO3]2- tetrahedra and one edge with a [NO3]- anion to form [(UO2)- (HPO3)(NO3)]^- ladder-like chains parallel to the b axis. The structure of 2 is also based upon one-dimensional anionic [(UO2)2(H2PO3)2(HPO3)(NO3)2]2-chains of comer-sharing penta- gonal [UOT] bipyramids with [H2PO3]- and [HPO3] tetrahedra, which is still unknown in structural chemistry of uranium so far. Crystal data for 1: monoclinic, space group C2/m, a = 21.808(7), b = 6.9605(15), c = 8.357(2) A, β = 98.327(15)°, V= 1255.2(6) A^3, Z = 4, Dc = 2.573 g/cm^3, F(000) = 888, μ = 13.086 mm^-1 the final R = 0.0418 and wR = 0.0906 (I 〉 2σ(I)); and those for 2: monoclinic, space group C2/c, a = 36.4549(8), b = 14.5296(11), c = 20.8253(11) A, β = 101.7440(8)°, V= 10799.7(10) A3, Z = 8, Dc= 1.711 g/cm^3, F(000) = 5424,μ = 6.144 mm^-1, the final R= 0.0368 and wR= 0.0865 (I〉 2σ(I)). 展开更多
关键词 URANIUM PHOSPHITE organically templated crystal structure fluorescence
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Synthesis and Crystal Structure of a Hepta-nuclear V-Cu-S Cluster:[VS_4Cu_6(Py)_8Br_3]
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作者 ZHENG Fa-Kun zhang han-hui +3 位作者 ZHUO Ru-Peng WU Yong-Sheng YU Xiu-Fen HUANG Jin-Shun(State Key Labortory of Structural Chemistry, Fujian Institute of Researchon the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian 350002)(Chemistry Depa 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1997年第5期392-396,共5页
The title compound has been synthesized by the reaction of(NH4)3VS4, CuBr and NMe4Br in pyridine and its structure was determined by singlecrystal X-ray diffraction. Crystallographic data: C40H40Br3Cu6N8S4V, M4= 1432.... The title compound has been synthesized by the reaction of(NH4)3VS4, CuBr and NMe4Br in pyridine and its structure was determined by singlecrystal X-ray diffraction. Crystallographic data: C40H40Br3Cu6N8S4V, M4= 1432. 95,orthorhombic space group Fdd2, a= 29. 9519 (2), b=13. 4719 (2), c= 25. 8612 (4)A, V= 10435. 2 (4), Z= 8, Dc= 1.824 g/cm3, F(000)= 5616,μ(MoKa) =50.64 cm-1, the final R =0.091 and wR =0. 206 for those 3401 unique reflectionshaving . The crystal structure determination shows that the cluster consists of a tetrahedral VS4 core encapsulated by a distorted octahedral array of six copperatoms which have two different coordination geometries, trigonal and tetrahedral. 展开更多
关键词 synthesis CRYSTAL structure VANADIUM CLUSTER COPPER CLUSTER
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Structural Studies of [V_2S_6O_2(CuPPh_3)_4(CuMeCN)_2]·2CH_2Cl_2·2PrOH 被引量:2
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作者 zhang han-hui YU Xiu-Fen +3 位作者 YANG Rong-Sheng ZHENG Fa-Kun HUANG Liao-Yuan ZHUO Ru-Peng(Department of Chemistry, Fuzhou University, Fuzhou, Fujian,350002)(State Key Laboratory of Structural Chemistry, Fuzhou, Fujian, 350002) 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1996年第5期353-357,共5页
The title V-Cu-S heterometallic cluster compound C84 H86Cl4Cu6N2O4P4S6V2, crystallizes in the monoclinic space group P21/n with a=16.381(5), b=17.114(3),c=16.749(6) A,β=107. 04(3)°,V=4490(2)A3, Mr=2128.84,Z=2,Dc... The title V-Cu-S heterometallic cluster compound C84 H86Cl4Cu6N2O4P4S6V2, crystallizes in the monoclinic space group P21/n with a=16.381(5), b=17.114(3),c=16.749(6) A,β=107. 04(3)°,V=4490(2)A3, Mr=2128.84,Z=2,Dc=1. 57 g/cm3,μ= 19. 6 cm-1,F(000)=2160. Final R=0.074(Rw=0.082) for 2662 unique reflections with I≥3σ(I). The V atom in the compound retains the tetrahedral geometry of the VS3O with S-V-S or S-V-O angles of 108.6(6)~110.3 (6)°.The cluster core [V2Cu6S6O2] of the compound can be regarded as two cluster cores [VCu3S3O] bonded by bondings of the Cu-Cu'(distances of 2.774(3)~2.707(5) A) and Cu-S (distances of 2.463(7)~2.396(9) A) with centrosymmetric. Atoms of the cluster core V2Cu6 form a distorted cube with the Cu Cu'or the V-Cu distances of 2. 774(3)~2. 707(5) A. 展开更多
关键词 crystal structure vanadium cluster copper cluster
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PPP项目模式下建设单位安全管理研究
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作者 潘龙文 张晗辉 +1 位作者 袁卢聪 李俊雄 《价值工程》 2021年第6期65-66,共2页
通过杭州某PPP建设项目实践,分析当前建设工程安全现状及原因,探讨建设单位在PPP建设项目中的安全管理措施等,并对建设单位PPP项目建设安全管理提出建议,确保项目安全可控。
关键词 建设单位 PPP项目模式 安全管理
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Crystal Structure of[Cd(pom)_2Cl_2]
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作者 Wu Wen-Shi(Department of Chemistry,Hua-qiao University, Fujian, China, 362011)Dong Mei-Bin Li Song-Xian +2 位作者 zhang han-hui Cheng Jian-Zhong(Department of Chemistry, Fuzhou University, Fujian , 350002) Huang You-Qing Hu Seng-Zhi (Department of Chemtstry, Xi 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1996年第4期330-332,共3页
Catena-[bis (3-methyl-4-nitropyridine N-oxide ) cadmiumdichloride],[Cd(C_6H_6N_2O_3)_2Cl_2], M_r= 491. 56, monoclinic , P2_1, a= 3. 799 (3), b= 29. 231 ( 9),c=7. 679(5) A, β=100. 19(6)°, V=839. 4 A ̄3, Z=2, D_c=... Catena-[bis (3-methyl-4-nitropyridine N-oxide ) cadmiumdichloride],[Cd(C_6H_6N_2O_3)_2Cl_2], M_r= 491. 56, monoclinic , P2_1, a= 3. 799 (3), b= 29. 231 ( 9),c=7. 679(5) A, β=100. 19(6)°, V=839. 4 A ̄3, Z=2, D_c= 1. 94 g/cm ̄3, λ(MoKa)= 0. 71069 A, F(000) =484, P(MoKa) = 16. 5 cm ̄(-1), final R=0. 038 for 1202 Observed reflections, T= 296K. The Cd atom is octahedrally coordinated by two O atoms from the trans 3-methyl-4-nitropyridine N-oxide (pom) ligands in the axial positions and four Cl atoms lying in the equatorial plane. The coordination octahedra form chains along the short a axis by edge sharing through the Cl atoms. 展开更多
关键词 cadmium complex nonlinear optical material one-dimensional coordination crystal structure
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老年非瓣膜病心房颤动患者应用达比加群酯抗凝治疗的观察研究 被引量:5
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作者 鲁洁 黄晓红 +4 位作者 郭颖 宋昌鹏 张晗晖 郑欣馨 房晓楠 《中国分子心脏病学杂志》 CAS 2018年第5期2621-2625,共5页
目的观察分析老年非瓣膜病心房颤动患者应用达比加群酯抗凝治疗的安全性。方法纳入2015年9月至2017年4月在阜外医院诊治的服用达比加群酯抗凝治疗的非瓣膜病心房颤动老年患者100例,服用达比加群酯110mg每日两次抗凝。收集患者临床资料... 目的观察分析老年非瓣膜病心房颤动患者应用达比加群酯抗凝治疗的安全性。方法纳入2015年9月至2017年4月在阜外医院诊治的服用达比加群酯抗凝治疗的非瓣膜病心房颤动老年患者100例,服用达比加群酯110mg每日两次抗凝。收集患者临床资料。随访记录不良临床事件。根据有无出血分为出血事件组及非出血事件组,分析两组间基线数据的差异。结果入组患者平均年龄(72.72±7.10)岁,男性55例。平均CHADS2 (3.61±1.48)分,平均HASBLED评分(1.95±0.81)分,平均随访时间(6.87±4.06)个月。随访发现无患者发生缺血性脑卒中、短暂性脑缺血发作、系统性栓塞、急性心肌梗死及再入院。无患者发生大出血,18例患者发生小出血(18%)。出血事件组CHADS2评分较高(P=0.077);同时服用ACEI类药物比例较高(P=0.033);同时服用ARB类药物比例较低(P=0.011);同时服用地高辛比例较高(P=0.018);血清白蛋白水平较低(P=0.039)。31例患者有复查血清学指标,发现随访时凝血酶原时间延长(P=0.026)、凝血酶原活动度降低(P=0.001)、INR增加(P=0.039)、活化部分凝血活酶时间(APTT)延长。(P<0.001)、凝血酶时间延长(P<0.001)及血清白蛋白水平升高(P=0.028)。结论本研究显示中国老年非瓣膜病房颤患者应用达比加群酯110 mg每日两次预防卒中,卒中及大出血风险低,小出血发生率18%,联合应用地高辛及血清白蛋白水平偏低可引起出血风险增加。 展开更多
关键词 达比加群酯 心房颤动 老年
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