HPLC法测定藿香正气颗粒中的厚朴酚

目的:建立厚朴制剂藿香正气颗粒中厚朴酚含量测定的HPLC法。方法:采用甲醇溶解样品超声制备供试液;HPLC色谱条件为:Zorbax RP-C18色诸柱(150mm×4.6mm,5μm);流动相:甲醇-水(80:20,v/v);流速:1.0mL/min;检测波长:294 nm。结果:厚朴酚的线性范围是0.02至4μg/mL,其线性相关系数R=0.9992,藿香正气颗粒中厚朴酚的含量为0.273mg/袋,其厚朴酚加样回收率为99.2%至101.4%,RSD为1.73%。结论:此方法快速简便,可用于评价藿香正气颗粒的质量。     

Multi-Mode Subsurface Sensing and Imaging for Land Mine Detection

The problem of detecting the many types of non-metallic land mines in the presence of widely varying soil background and irrelevant underground clutter is an example of one of the most difficult subsurface sensing problems. The application of a variety of different sensing techniques and modalities, and particularly the processing and fusing of the information from these sensors with signal-processing techniques that take account of the physical operating characteristics of each sensor, appears to be the way to make progress in such challenging applications. The progress of the Northeastern University multi-sensor demining effort funded through the Army Research Office's Multidisciplinary University Research Initiative is surveyed as an example of how this strategy can work.     

Book reviews

URBAN TRANSPORT. Kevin Hay and John Sheldrake (editors). Ashgate, Aldershot, UK, 1997. ISBN 1 85972 466 3 (hardback). 133 pp, bibliography and index. rrp $84.50.

ASIANS IN AUSTRALIA: Patterns of Migration and Settlement. James E. Coughlan and Deborah J. McNamara (editors). Macmillan Education Australia, Melbourne, 1997. ISBN 0 7329 4561 5 (hardback). 330pp, bibliography and index. rrp $64.95.

SOCIAL EXCLUSION IN EUROPEAN CITIES: Processes, Experiences and Responses. Ali Madanipour, Goran Cars and Judith Allen (editors). Jessica Kingsley and the Regional Studies Association, London, 1998. ISBN 1 85302 609 3 (paperback). 301pp, bibliography and index. rrp UK17.95stlg.

THE PROPERTY DEVELOPMENT PROCESS: Western Australia. Hugh Reynolds and Peter Solomon. Victor Publishing, Perth, 1998. ISBN 0 646 35442 6 (paperback). 174pp. rrp $65.00.

THE ANTHROPOLOGY OF POLICY: Critical Perspectives on Governance and Power. Shore, C. and Wright, S. (editors). Routledge, London, 1998. ISBN 0 415 13221 5. 294pp, bibliography and index. rrp $39.95.

THE CHANGING SHAPE OF WORK. Richard K. Brown (editor). Macmillan Press Limited, London, 1997. ISBN 0 312 17251 6 (paperback). 223pp including bibliography and index. rrp $42.95.     

Development of a food product profile for boiled and steamed sweetpotato in Uganda for effective breeding

This study sought to understand user preferences of raw, boiled and steamed sweetpotato, a staple food in Uganda. A sequential methodology involving state of knowledge review, gendered food mapping, processing diagnosis and consumer testing was used in Lira and Kamwenge districts. Preferred raw sweetpotato characteristics were large roots (≥ 3 cm diameter) with a sweet taste, smooth skin and hard texture, while mealiness, sweet taste and good sweetpotato smell were important attributes for boiled sweetpotato. Processors, mostly women, highlighted ease of peeling and sappiness of raw roots. There were gender differences in quality characteristic preferences and perceived importance. The released variety, NASPOT 8, had the highest overall liking in Kamwenge and was well liked in Lira. Penalty analysis of consumer data showed that sweetness and firmness were key drivers of overall liking. The results will support breeding programmes in meeting specific end-user product profiles, selection criteria and uptake of new varieties.     

Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron-Deficient Polymer Processed by Solution Shear Coating

Precise control of the microstructure in organic semiconductors (OSCs) is essential for developing high-performance organic electronic devices. Here, a comprehensive charge transport characterization of two recently reported rigid-rod conjugated polymers that do not contain single bonds in the main chain is reported. It is demonstrated that the molecular design of the polymer makes it possible to achieve an extended linear backbone structure, which can be directly visualized by high-resolution scanning tunneling microscopy (STM). The rigid structure of the polymers allows the formation of thin films with uniaxially aligned polymer chains by using a simple one-step solution-shear/bar coating technique. These aligned films show a high optical anisotropy with a dichroic ratio of up to a factor of 6. Transport measurements performed using top-gate bottom-contact field-effect transistors exhibit a high saturation electron mobility of 0.2 cm² V⁻¹ s⁻¹ along the alignment direction, which is more than six times higher than the value reported in the previous work. This work demonstrates that this new class of polymers is able to achieve mobility values comparable to state-of-the-art n-type polymers and identifies an effective processing strategy for this class of rigid-rod polymer system to optimize their charge transport properties.