化学发光法测定去羟肌苷

建立了快速检测去羟肌苷的化学发光方法。在HNO3介质中,去羟肌苷对KMnO4-Na2SO3化学发光体系有较强的抑制作用,且抑制的程度与去羟肌苷的质量浓度在一定范围内呈良好的线性关系,据此可以测定去羟肌苷含量。方法的线性范围为4.0×10-7~1.0×10-4g/mL,检出限为9.6×10-8g/mL。对8.0×10-5g/mL去羟肌苷测定的相对标准偏差为2.0%(n=11)。方法适用于胶囊中去羟肌苷的含量测定。     

灿烂甲酚蓝体系分光光度法测定肌苷

在pH=6.9的BR缓冲体系中,灿烂甲酚蓝与肌苷反应,形成离子缔合物,溶液颜色发生改变。其最大褪色波长位于630 nm处,在褪色波长处,肌苷的浓度与溶液的褪色呈良好的线性关系,可用于肌苷的测定。 肌苷的浓度在0.18×10-6~6.0×10-6 g/mL范围内符合比尔定律,相关系数r=0.999 3,摩尔吸光系数为1.13×104 L/(mol·cm),检出限为53.5×10-9 g/mL。 方法简便、准确、灵敏,可用于片剂中肌苷的测定。     

从肌苷简便合成腺苷

在不改变骨架的前提下提出一种从肌苷通过官能团转换制备腺苷的工艺方法,总收率可达62%。肌苷在醋酸钠存在下与醋酸酐发生酯化反应以92%的收率得到2′,3′,5′-三乙酰肌苷,其化合物经吡啶和三氯氧磷处理形成吡啶盐溶液,未分离直接在40℃、0.25～0.30MPa压力下进行氨解反应以67%产率制得腺苷。腺苷结构经1HNMR、MS测试技术确证。这种简便的腺苷合成方法可适合于工业化生产。     

高效毛细管电泳技术测定肌苷口服液的含量

介绍了应用高效毛细管电泳技术测定肌苷口服液含量的方法。实验是将肌苷口服液直接进样,以硼酸－硼酸盐为缓冲溶液。实验的回收率为９５．０％～９９．８％,相关系数０．９９８５,精密度的变异系数小于５％。方法简便、快速、准确、灵敏度高。     

肌苷的离子交换法提取工艺研究

研究了肌苷发酵液不同pH值、树脂预平衡条件、饱和树脂的洗菌、淋洗条件对肌苷离子交换提取和解吸工艺影响情况，并对其离子交换吸附机理进行了详细探讨，旨在确定最佳提取工艺条件。     

肌苷和肌苷酸测定的新方法研究

采用紫外吸光光度法与高压纸电泳法联用，对次黄嘌呤类物质-肌苷及肌苷酸含量测定，试验了高压纸电泳法分离肌苷及肌苷酸的最佳条件，并对肌苷口服液等样品进行分离和测定。     

肌苷在玻碳电极上的伏安法研究

应用线性扫描伏安法（LSV）,微分脉冲伏安法（DPV）和循环伏安法（CV）对肌苷在玻碳电极（GCE）上的阳级伏安行为进行了研究,发现在0．1mol/L磷酸氢二纳溶液中,于1．42V（vs.Ag／AgCl）左右产生一个阳极氧化峰,峰电流与肌苷浓度在5×10-4～8×10-2g/L范围内呈线性关系,峰电位随溶液pH值增加而降低。肌苷在与次黄嘌呤、黄嘌呤、尿酸共存时,可得4个分辨良好的阳极氧化峰,它们的峰电位分别为1．42V、1．07V、0．72V和0．26V。用本法不需分离直接测定了药物针剂和加标尿样。实验结果表明肌苷的电极反应为扩散控制不可逆过程。     

以鸟苷为原料合成2-异肌苷

以廉价的鸟苷为原料,经过乙酰基保护糖环上的羟基,再和POCl3反应,将6-位羰基转化为氯原子,继而还原脱除氯原子,然后在亚硝酸异戊酯作用下发生重氮化反应,将2-位氨基转化为羟基,最后脱除乙酰基,以5步和56％的总收率得到2-异肌苷.重氮化优化的反应条件是:6倍量的亚硝酸异戊酯为重氮化试剂、CHCl3/H2 O为混合溶剂...     

高效液相色谱法测定大鼠心肌组织中次黄嘌呤,肌苷和腺苷含量

研究了一种快速、简便测定大鼠心肌组织中次黄嘌呤（ＨＸ）、肌苷（Ｉ）和腺苷（ＡＤＯ）的高效液相色谱法。采用ＷａｔｅｒｓμＢｏｎｄａｐａｋＣ_（１８）色谱柱，含７％甲醇的２ｍｍｏｌ／Ｌ磷酸钠缓冲液（ｐＨ＝６．０）为流动相，等比洗脱，２５４ｎｍ处紫外检测，１２ｍｉｎ内即可分析一个样品。本法生物样本预处理简单，因而平均回收率达９５％以上。ＨＸ在５．０～５００ｎｇ，Ｉ和ＡＤＯ在１０～１０００ｎｇ范围内，线性关系良好，相对标准偏差分别低于３．４０％（日内）和５．２０％（日间），并测定了３０份心肌组织中次黄嘌呤、肌苷和腺苷的含量。对所用的色谱分析条件进行了讨论。     

利用模式识别技术识别鱼肉的鲜度

利用模式识别技术与紫外分光不镀分析法结合，根据鱼肉中的肌苷酸和肌苷的含量对鱼肉鲜度进行了识别，采用人工神经网络法和逐步判别分析法两种模式识别技术，判别结果令人满意。     

STUDIES ON INOSINE EXTRACTION BY ION EXCHANGE METHOD

Inosine,i.e.hypoxanthineriboside,hasgreatsignificanceinmedicinemd..t.y['J.Itisalsowidelyusedinfoodindustrybecauseofitsstrongfunctionof..increasingdelicateflavor.Atpresent,thedomesticinosineproducingtechnologyL'Jmainlyconcentratesontheadsorption--elutionprocessofinosinefermentationsolution(pH=3--4)using001X7canonexchangeresinandactivatedcarbon,inwhichthegrossextractionpercentisabout50%,while93%inJapan['].Therefore,theextractiontechnologyshouldbemadeadetailedresearchtoincreasetheextractionperc…     

STUDIES ON INOSINE EXTRACTION BY ION EXCHANGE METHOD

The adsorption characteristics of inosine from fermentation solution on anion exchange resin under the condition of different pH,resin type are investigated.Besides,the desorption conditions are studied under different temperature.The adsorption and desorption mechanism are described to obtain the optimum technological condition of inosine extraction.     

Kinetics of Hydrolysis of Inosine in Aqueous Solutions

The kinetics of hydrolysis of inosine was studied in aqueous solution at 353 K over a pH range of 0.45 - 12.13. The decomposition was followed by HPLC. The pH - profile was accounted for by assuming spontaneous water-catalyzed decomposition of the inosine molecules at various degrees of dissociation.     

Development of A Dual Channel Chemiluminescence FIA System for Rapid Measurement of Fish Freshness

Abstract

A dual channel chemiluminescence FIA system for the rapid measurement of the fish freshness index KI $$ where [IMP], [HxR] and [Hx] are, respectively, the inosine 5′-monophosphate, inosine and hypoxanthine contents of fish meat was developed. The system consisted of a pair of chemiluminescence FIAs (CL-FIA); one for the measurement of [IMP] + [HxR] + [Hx], and the other for [HxR] + [Hx]. IMP, HxR or Hx were measured using a reactor comprising immobilized alkaline phosphatase, purine nucleoside phosphorylase (PNP) and xanthine oxidase (XOD). The calibration curves for IMP, HxR or Hx were linear from 0.06 μM to 100 μM for a sample volume of 20 μl. The time for a single KI measurement was less than 1 min. This fish freshness FIA system is rapid, convenient and applicable for fish freshness measurements in real fish samples.     

虎纹捕鸟蛛毒中次黄嘌吟核苷的分离与鉴定

本文从虎纹捕鸟蛛(Selenocosmia hu wena)粗毒中经高效液相色谱分离纯化出一种组分,通过场解吸质谱(FDMS)和电子电高质谱(EIMS)鉴定为次黄嘌呤核苷,其含量为3.9%.同时,进一步用标准样品进行紫外、液相色谱对照验证,并对次黄嘌呤核苷以毒液中的一种成分的形式存在的作用进行了简单的讨论.     

Behavior of Copper (II) Ion to Inosine

Abstract

The DC polarographic behavior of the Cu(II)-inosine complex was investigated, in aqueous solutions of inosine in Britton Robinson buffer solutions at pH's from 1.0 to 4.0. At low concentrations of free inosine ion, only one polarographic wave was found corresponding to a two-electron reduction.

Anisotropy of g/ = 2,039, g// = 2,287 and A// = 172G, A/= OG, was observed in the ESR spectrum of the Cu(II)/inosine complex. When the composition ratio of the complex was obtained by both polarography and ESR, it was found that the ratio Cu(II) to inosine was 1:2. The polarographic wave showed a two electron reduction wave.     

肌苷制剂的高效液相色谱法测定

A high performance liquid chromatographic method was established for the determination of inosine intablet,capsule and injection. Sodium benzoate can also be determined.The mobile phase consists of a mixture ofmethanol-water,30:70(V/V).Metronidazole is used as the internal standard.The analytical column is Nucleosil C_(18),7μ.The average recoveries for inosine and sodium benzoate were 99.37±0.62%and 98.83±0.44%.