The influence of temperature and X-ray dose on the deprotonation of lyophilized phenylalanine during X-ray photoelectron spectroscopy

被引：4

作者：

Cardenas, JF

Gröbner, G

机构：

[1] Dept Chem, N-0315 Oslo, Norway

[2] Umea Univ, S-90187 Umea, Sweden

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2006年 / 152卷 / 1-2期

关键词：

phenylalanine; XPS; deprotonation;

D O I：

10.1016/j.elspec.2006.03.004

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Lyophilizedphenylalanine (LP) samples were prepared from aqueous solutions at pH similar to 1.3 and subsequently analysed using X-ray photoelectron spectroscopy (XPS) in combination with cryogenics. When samples are measured at temperatures above similar to 0 degrees C deprotonation occurs, which gradually proceeds with X-ray bombardment. In addition, deprotonation scales linearly with the difference between the Cl and the Na concentration, which strongly suggests that HCl sublimates from the sample. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：87 / 90

页数：4

共 15 条

[1]

Beamson G, 1998, SURF INTERFACE ANAL, V26, P343, DOI 10.1002/(SICI)1096-9918(19980501)26:5<343::AID-SIA377>3.0.CO

[2]

2-M

[3]

Beamson G., 1992, ADV MATER, DOI DOI 10.1002/ADMA.19930051035

[4] Lyophilized histidine investigated using X-ray photoelectron spectroscopy and cryogenics:: Deprotonation in vacuum [J].