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Journal of Thermal Analysis and Calorimetry
Authors:
Lingli Peng
,
Xiangyu Xu
,
Zhi Lv
,
Jiaqing Song
,
Mingyuan He
,
Qian Wang
,
Lijun Yan
,
Yang Li
, and
Zhaofei Li

Abstract

The boehmite nanofibers were prepared by using NaAlO2 and Al2(SO4)3 as the starting materials without any surfactant. The phase transitions of the boehmite nanofibres against different temperature were studied and various phases were derived from well-crystallized boehmite nanofibers. All these phases had the same morphology even after high temperature calcination. In addition, the retention of specific surface area of the samples were very high because of the limited aggregation occurred in calcinations for each sample. For instance, the γ-Al2O3 obtained at 500 °C had the specific surface area (208.56 m2/g) with an average pore diameter of 6.0 nm. With the further increase of the calcination temperature, the nanofibers became shorter and coarsening, which resulted in the decrease of the specific surface area. It is worthwhile to notice that the BET surface areas (40.97 m2/g) and the pore volume (0.27 cm3/g) of the fibrous structures obtained after 1200 °C calcination are substantially higher than that of the non-fibrous alumina because of the morphology maintenance.

Restricted access
Acta Chromatographica
Authors:
Mengya Lu
,
Qianqian Tang
,
Chenyu Zhou
,
Zhizheng Fang
,
Zheng Fan
,
Xiangyu Li
,
Rongchun Han
, and
Xiaohui Tong

Abstract

An easy, quick, and sensitive approach adopting ultra-performance liquid chromatography (UPLC) equipped with diode array detector was used to analyze and systematically evaluate the quality of Pudilan tablets manufactured by 12 distinct pharmaceutical companies. In this research, 15 peaks were chosen as the common peaks to assess the similarities for different batches (S1–S43) of Pudilan tablet samples. In comparison with the control fingerprint, similarity values for 43 batches of samples exceeded 0.922. In addition, by analyzing the reference substances of epigoitrin, caffeic acid, chlorogenic acid, acetylcorynoline, baicalin and baicanshialein, the chromatogram of the 6 reference substances was established. The recoveries for the reference substances which demonstrated good regression in the linear range (r 2 > 0.999) were in the range of 98.3–101.1%. The results demonstrated that the established method was highly accurate, efficient and reliable. This study provides a valid, dependable and pragmatic method to evaluate the quality of Pudilan tablet.

Open access