Propranolol hydrochloride degradation using La@TiO2 functionalized with CMCD

Propranolol hydrochloride can be considered a persistent and bioaccumulative pharmaceutical in the environment. This drug and its by-products are potentially toxic and have adverse effects, since these compounds have been associated with endocrine-disrupting effects, reproductive deficiencies, embryo abnormalities and pericardial oedema. TiO₂–La 0.05%–carboxymethyl-β-cyclodextrin (CMCD) nanoparticles were successfully prepared by a simple two-step method, which consists of sonification and functionalization. The characterization analyses reveal that lanthanum is dispersed on the semiconductor surface, probably forming Ti–O–La bonds, which can induce oxygen vacancies and surface defects that effectively restrain the recombination of photogenerated electron/holes pairs. The efficiency of TiO₂–La 0.05%–CMCD samples in degradation of propranolol under UV-light irradiation is higher than that of pristine TiO₂ within 20 min reaction, probably due to complex formation between the β-blocker and the oligosaccharide, which allows us to propose a photocatalytic mechanism based on the formation of intermediates and competition of these compounds to the radicals and CMCD cavities.     

HPLC手性离子对试剂法拆分普萘洛尔对映体

建立了一种以Nova PakCN HP氰基柱为固定相,以V(二氯甲烷)∶V(乙醇)=97∶3为流动相,添加N 苄氧羰基 S 苯基 L 半胱胺酸甲酯(MBPCE)为手性离子对试剂,拆分普萘洛尔对映体的高效液相色谱的分析方法。当c(MBPCE)=3.5mmol/L,流动相流速为0.5ml/min,检测波长为254nm时,普萘洛尔对映体的分离选择性为1.15,分离度为1.02,线性范围为0.1～4.0mg/ml,浓度测定的变异系数为0.21%～0.86%。