玫瑰花色素的提取及其稳定性研究

文章以玫瑰花为原料提取了玫瑰花红色素,并对其理化性质和稳定性进行了研究。结果表明,玫瑰花红色素用95%乙醇浸泡提取,提取率为7.3%。色素的水溶性好,对光、热、弱酸性至弱碱性介质及食品添加剂相当稳定,耐受一般的食品饮料加工条件。色素对氧化剂H2O2的耐受能力较弱,而对还原剂N aHSO3则较为稳定。玫瑰花红色素是一种提取工艺简单、性质稳定、颜色鲜艳、价廉易得、来源充足的天然色素,可用于有色糖果、食品、果汁饮料、茶饮料及酒类。     

和田玫瑰花红色素的提取及性质研究

文章介绍了和田玫瑰花红色素的提取,研究了光,温度,酸碱性,氧化剂,还原剂,防腐剂,添加剂,金属离子对和田玫瑰花红色素稳定性的影响与理化性质进行了初步研究。玫瑰花红色素的耐光性较好,耐热性很好,可做食品的着色剂,但在使用过程中应尽量避免长时间光照。添加剂对红色素的影响不大,防腐剂对红色素影响不大。Mg2 ,Ba2 ,Na ,K ,Cd2 ,Ca2 对色素的稳定性无影响,Al3 ,Cu2 ,Fe3 对色素有一定影响,在提取和保存过程中应避免使用铁器。     

唐菖蒲花红色素稳定性研究

以唐菖蒲花瓣为实验材料,研究了光、热、紫外线(365nm)、PH值、还原介质、氧化介质、蔗糖、防腐剂、金属离子等对红色素稳定性的影响.结果表明:该色素为水溶性花青苷类色素,在PH为1时耐光、耐热性较强,并具有较强的抗辐射能力,但耐还原性、氧化性较差;蔗糖、苯甲酸钠对色素稳定性有影响,金属离子K 、Na 、Ca2 、Cu2 、Zn2 对色素溶液色泽影响很小,Mg2 、A13 对唐菖蒲花红色素有增色作用,而Fe3 的加入改变了色素溶液的颜色,对色度有一定影响.研究结果表明,该红色素适用于在低糖、酸性浓缩食品中使用,是一种值得开发的天然保健色素.     

甘谷辣椒红色素稳定性研究

通过对甘谷辣椒红色素进行提取,确定了其中的4种成分,研究了色素提取的最佳条件及色素的稳定性.结果表明:该色素含有辣椒红色素、辣椒玉红素、β-胡萝卜素、辣椒碱、二氢辣椒碱5种主要成分.色素在480 nm有最大吸收峰,该色素水溶性较差,油溶性较好,在pH值4~10时色调不变,具有良好的热稳定性.温度为90℃时,色素稳定.良好的耐酸碱性,耐光性较差,连续光照48 h,色素残存率为45%,1 mg/L Na+,Ca2+、Al3+溶液对色素最大吸收峰无明显影响,1 mg/L Cu2+,Fe2+溶液使色素最大吸收峰偏移.     

蛇莓果红色素降解动力学研究

以鲜蛇莓果为原料提取其红色素,测定该色素提取液在不同光照、pH值及温度下于540nm波长的吸光度值,以此表征其稳定性,并在此基础上归纳其降解反应动力学方程.结果表明:鲜蛇莓果红色素光降解、酸降解及热降解均符合动力学一级反应规律,热反应活化能为17.98 kJ/mol,是一种较为理想的酸性食品添加剂,适用于冷加工食品着色.     

玫瑰花红色素的研究进展

本文介绍了玫瑰花红色素的性质,综述了玫瑰花红色素的提取方法及其稳定性的影响因素,并展望了玫瑰花红色素的应用前景。     

草莓红色素的提取及稳定性研究

介绍了从草莓（Strawberry）中提取红色色素的方法和条件,并对该色素的稳定性进行了研究。结果表明：该色素对光、热、氧化剂（H2O2）与还原剂（Na2SO3）及金属离子的作用稳定,适宜的pH值范围为2－8。     

鸡血李红色素稳定性的动力学研究

研究从鸡血李中提取出的红色素的稳定性及热降解动力学 结果表明 ,pH值不仅影响色素的色泽 ,同时也影响色素的降解 ,pH =5时最稳定 ;Vc ,Fe3+ ,Cu2 + 离子促进色素降解 ,而蔗糖、果糖等对色素无促进作用 色素适合酸性食品着色     

五味子红色素的提取工艺

采用pH=3的乙醇提取五味子色素, 通过单因素实验设计分别研究了提取温度、 时间、 材料与溶剂比例3种因素对五味子色素提取率的影响. 通过正交实验法, 以五味子红色素的提取率为主要指标, 对pH=3的乙醇提取五味子红色素的工艺进行优化, 确定了五味子红色素的最佳提取工艺: 以5倍量pH=3的乙醇溶液为溶剂, 75 ℃下浸提2 h. 通过对五味子红色素的红外光谱进行解析, 确定其属于吲哚类色素.     

白檀果肉红色素含量测定及基本理化性质的初步研究

本文优选了白檀果肉红色素的提取溶剂、测定该色素的含量,并对该色素的基本理化性质进行了初步研究,结果表明:1.5mol/LHCl-50%乙醇(V/V=15:85)是其最佳提取溶剂.色素含量为604.48mg/100g.该色素为水醇兼溶花色苷类色素,在酸性条件下稳定且色泽鲜艳.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.