高效液相色谱法测定肌肽滴眼液中L-肌肽的含量及有关物质

目的:建立肌肤滴眼液中L-肌肤的含量测定的HPLC方法.方法:采用Kromasil NH2色谱柱(200 mm × 4.6mm,5 μm),流动相为乙腈-40 mmol·L-1磷酸氢二钾溶液(44:56,磷酸调pH 6.3).流速1.0 mL·min-1,检测波长为210 ml,柱温为35℃.结果:肌肤在9.93～99.3μg·mL-1范围内线性关系良好(r=0.999 8),平均回收率为99.8%(RSD=1.0%,n=9),滴眼液中含L-肌肽的标示百分含量为97.0%～102.0%.结论:该方法操作简便、重复性好、专属性强,可用作肌肤滴眼液中L-肌肽的质量控制.     

高效液相色谱法测定川射干鸢尾苷元磺酸钠及其制剂泰克吉宁注射液含量和有关物质

建立高效液相色谱法测定鸢尾苷元磺酸钠(4′,5,7-三羟基-6-甲氧基异黄酮-5′-磺酸钠)及其制剂泰克吉宁注射液的含量及有关物质。采用C18色谱柱(150×4.6mm,5μm),流动相为甲醇-5%醋酸水(80:20),流速为1.0mL/min,检测波长为263nm。鸢尾苷元磺酸钠在11～100μg/mL范围内线性关系良好,回归方程Y=43.3609X-1.5973(r=0.99998),平均回收率为99.77%(n=9)。最低检测限为0.052μg/mL,与有关物质分离良好。本法快速、简便、准确,专属性强。     

用高效液相色谱法(HPLC)测定肌苷中有关物质和降解产物

用HPLC测定肌苷中有关物质和降解产物 ,与主药有良好的分离效果。色谱柱为HypersilC1 8(2 5 0mm× 4 .6mm ,5 μm) ,流动相甲醇 -水 (甲醇与水体积比为 10∶90 ) ,流速 1mL·min- 1 ,检测波长 2 4 8nm。     

RP-HPLC法测定奥利司他片的含量

目的:建立奥利司他片的含量测定方法.方法:采用高效液相色谱法,Agela Venusil XBP-C18 色谱柱(15cm×4.0mm,5p m),流动相:甲醇:水:甲酸(89:11:0.1);柱温为35℃;流速1.5mL·min-1;进样量10μ L.紫外检测器,检测波长为210nm.结果:主成分奥利司他在0.4～0.6mg/ml浓度范围内线性关系良好,相关系数r>0.999,平均回收率为99.4%,符合规定.结论:该方法专属性强,准确度好,可作为奥利司他片含量测定的质量控制方法.     

阿比特龙原料药有关物质方法学研究

目的：建立高效液相色谱测定阿比特龙原料药（乙酸阿比特龙酯）有关物质的方法,对乙酸阿比特龙酯原料药中具体杂质做一个定量的控制。方法：采用Luna C18 色谱柱（250 mm*4.6 mm, 5 滋m）,流动相为甲醇- 乙腈- 水梯度洗脱,运行时间为60 min,检测波长220 nm,柱温40 ℃,流速1 mL/min。结果：乙酸阿比特龙酯与有关物质分离度良好,空白溶剂不干扰乙酸阿比特龙酯及其有关物质的检出;杂质A、杂质B、杂质C、杂质D、杂质E、杂质F分别在0.413～14.45 ug·mL-1（r=0.9996）,0.420～14.71 滋g·mL-1（r=0.9997）,0.398～13.98 ug·mL-1（r=0.9996）,0.450～15.74 ug·mL-1（r=0.9999）,0.394～13.79 ug·mL-1（r=0.9995）,0.387～13.54 ug·mL-1（r=0.9998）范围内峰面积呈良好的线性关系;平均加样回收率（n=9）分别为：98.14%,99.34%,99.65%,100.27%,86.21%,97.64%,RSD 分别为2.91%,2.59%,1.99%,1.69%,0.91%,3.68%（n=9）。最低检测限分别为：0.04 、0.09、0.03、0.07、0.02 、0.12 滋g·mL-1。结论：本方法灵敏度高,操作简便准确,重复性好,适用于乙酸阿比特龙酯有关物质检查。     

RP-HPLC法测定泽兰中桦木酸的含量

目的：建立反相高效液相色潽法测定泽兰中桦木酸的含量.方法：采用AlltimaTM-C18（250 mm×4.6 mm,5μm）;以甲醇-0.2％磷酸水溶液=85：15进行等度洗脱,流速为1.0 mL/min,检测波长为202 nm,柱温为35℃.结果：桦木酸的线性范围为3.968～99.200 μg（r=0.997 3）,平均回收率为100.87％.结论：该方法结果准确、简便可行、重复性好,可为泽兰的质量控制提供依据.     

复方黄连素片中盐酸小檗碱含量测定

目的：建立测试黄连素片中盐酸小檗碱含量的高效液相方法,并对此方法进行系统的方法学验证,以确保应用该方法测试的结果准确、可靠。方法：采用色谱柱：Agilent TC-C18柱（4．6 mm ×150 mm,5μm,Agilent,美国）,流动相：乙腈－0．05 mol／L磷酸二氢钾溶液（45∶55,含5％的0．05 mol／L庚烷磺酸钠溶液）,检测波长为265 nm。结果：盐酸小檗碱在2．5～80μg／mL范围内线性关系良好,得到线性回归方程为Y＝421 ．5X＋17．32,相关系数为0．9997（n＝6）;低、中、高浓度批内精密度的RSD值分别为0．30％、0．58％、0．30％,批间精密度的RSD为0．80％;重复性RSD为0．27％;低、中、高浓度的加样回收率分别为99．66％、99．88％、99．98％;供试品溶液室温放置8h稳定,RSD为0．41％。结论：本方法测定黄连素片中盐酸小檗碱的含量准确、可靠,操作简单、用时短,可用于黄连素片中盐酸小檗碱的含量测定。     

高效液相色谱法测定注射用盐酸吉西他滨含量测定

目的:建立高效液相色谱法测定注射用盐酸吉西他滨的含量。方法:采用高效液相色谱法,色谱柱:Aglea Venusil XBP C8 4.6×250mm 5um;流动相:以醋酸铵缓冲液(取醋酸铵3.85g加水800ml使溶解,加冰醋酸调p H值至5.7,加水1000ml)-甲醇(90:10)为流动相,检测波长268nm。结果:盐酸吉西他滨线性为y=944.25x+4608.5,r=0.9998,溶液在70.64 ng/ml~131.20ng/ml的浓度范围内线性关系良好;平均回收率为99.89%,RSD为0.53%(n=9),重复性RSD=0.12%(n=6);结论:该方法简便,线性、重复性好、准确度高,采用此方法能准确测定注射用盐酸吉西他滨含量。     

高效液相法测定盐酸乐卡地平片含量

使用高效液相色谱法测定乐卡地平片含量,流动相为乙腈-0.O1 mol/L乙酸铵溶液—三乙胺(650:350:1)(pH 6.0).结果显示盐酸乐卡地平在浓度为2.05～404.0μg/mL范围内具有良好的线性关系,盐酸乐卡地平片剂的平均标示量含量为100.3％,符合要求.研究表明HPLC色谱法对乐卡地平片剂进行含量测定...     

HPLC法测定花生根中白藜芦醇的含量

本文采用反相高效液相色谱法测定了花生根中白藜芦醇的含量.选用ODS-C18色谱柱(200 mm×4.6mm,5μm),以甲醇-水(4555)为流动相,流速为0.5 mL/min,紫外检测波长为303nm.结果表明,白藜芦醇峰面积与其浓度之间呈现良好的线性关系,线性回归方程为Y=15879.28X+12350.2,相关系数为0.9996.方法简单,快速,精密度好,回收率为98.8%,相对标准偏差为1.79%.     

新药23-羟基白桦酸的含量及其他三萜的RP-HPLC测定

目的:建立23-羟基白桦酸及有关物质的RP-HPLC测定方法。方法:高效液相色谱法,色谱柱为Agilent Zorbax SB-C18(250 mm×4.60 mm,5μm),流动相:乙腈-0.2%醋酸水溶液(62∶38),流速为0.8 mL.min-1;检测波长204 nm。结果:23-羟基白桦酸进样量与峰面积呈良好线性关系,线性范围为0.20~4.0μg,r=0.999 9(n=5);回收率为97.4%~104.7%(n=9)。结论:本法快速,简便,重复性好,可用于23-羟基白桦酸的含量测定和有关物质检查。     

Nucleosides and Related Substances

A novel method is described for the synthesis of pyrimidine nucleosides. 1-β-d-Gluco-pyranosyl-, 1-β-d-xylopyranosyl-, and 1-β-d-ribopyranosyl-uracils were prepared in good yields by the condensation of uracil with 1-O-trichloroacetyl-2,3,4,6:tetra-O-acetyl-α-d-glucopyranose, 1-O-trichloroacety1-2,3,4-tri-O-acetyl-α-d-xylopyranose, and 1 - O - trichloroacetyl-2,3-4-tri-O-acetyl-α-d-ribopyranose, respectively. Glucosyl- and xylosyluracils were prepared under the reaction conditions similar to those used in the Hilbert-Johnson method, whereas the synthesis of ribosyluracil was carried out by the fusion procedure of the reactants.     

Nucleosides and Related Substances

A new procedure which involves 1-trichloroacetyl sugars as the starting material has been developed for the synthesis of purine nucleosides. 7-β-d-Glucopyranosyl-, 7-β-d-xylopyranosyl-, 7-β-d-ribopyranosyl-theophylline, 9-(tetra-O-acetyl-β-d-glucopyranosyl)-2,6,8-trichloropurine and 9-β-d-glucopyranosyl adenine were prepared in good yields by the reaction in fusion of purine bases with 1-trichloroacetyl sugars, using zinc chloride, p-toluenesulfonic acid, or ethyl polyphosphate as catalyst. 9-d-Ribofuranosyl adenine was also prepared by the same procedures, although the anomeric configuration of the compound is not yet definite. The effect of catalysts on the yields of purine nucleosides is discussed.     

Separation of Ofloxacin and Its Six Related Substances Enantiomers by Chiral Ligand‐Exchange Chromatography

A chiral ligand‐exchange high‐performance liquid chromatography method was developed for the enantioseparation of ofloxacin and its six related substances termed impurities A, B, C, D, E, and F. The separation was performed on a conventional C₁₈ column. Different organic modifiers, copper salts, amino acids, the ratio of Cu²⁺ to amino acid, pH of aqueous phase, and column temperature were optimized. The optimal mobile phase conditions were methanol‐water systems consisting of 5 mmol/L copper sulfate and 10 mmol/L L‐isoleucine (L‐Ile). Under such conditions, good enantioseparation of ofloxacin and impurities A, C, E, and F could be observed with resolutions (R_S) of 3.54, 1.97, 3.21, 3.50, and 2.12, respectively. On the relationship between the thermodynamic parameters and structures of analytes, the mechanism of chiral recognition was investigated. It was concluded that ofloxacin and impurities A, C, E, and F were all enthalpically driven enantioseparation and that low column temperature was beneficial to enantioseparation. Furthermore, the structure–separation relationship of these analytes is also discussed. Chirality 27:843–849, 2015. © 2015 Wiley Periodicals, Inc.     

Sialic Acids and Related Substances

N-Acetyl-D-galactosamine, N-acetyl-D-mannosamine and N-acetyl-D-glucosamine were allowed to react with oxalacetic acid under alkaline conditions, and the condensation products purified by ion-exchange chromatography. Properties of these products on the whole are similar to each other, though there is a minor but significant diference in the condensation product with N-acetyl-D-galactosaminc. Paper chromatograms of the condensation products suggest that N-acetyl-D-galactosamine as well as N-acetyl-D-glucosamine are epimerized partly before they condense with oxalacetic acid to givc each two sialic acids with different configurations at C-5 from each other.     

Production of Nucleic Acid Related Substances by Fermentative Processes

It was found that a guanine and adenine-requiring mutant of Micrococcus glutamicus accumulated the ultraviolet-absorbing substance in the culture fluid. A KY9978 strain, which accumulated the largest amount of the substance, we selected from the guanine auxotrophs derived from the guanineadenine doubleless mutant. The substance was isolated in a crystalline form from the culture fluid by the use of ion exchange resins, Diaion SA 21A and SK No. 1, and identified chemically and enzymatically as 5′-xanthylic acid, an intermediate from 5′-inosinic acid to 5′-guanylic acid on the purine nucleotide biosynthesis.     

反相高效液相色谱法测定万寿菊中的玉米黄质

用反相高效液相色谱法测定万寿菊中的玉米黄质。以丙酮与石油醚提取色素,色谱柱Kromasil(C184.6 mm×150mm),乙腈∶甲醇∶二氯甲烷(体积比为70:20:10)为流动相,在450 nm下检测玉米黄质。结果表明,玉米黄质的质量分数为0.158%,玉米黄质的回收率是94.7%~98.1%,平均回收率为96.4%(RSD=1.36%)。该方法简便、准确,有良好的重现性,技术参数指标符合食品理化分析的要求。