主题：【求助】(已应助，除第4篇会议馆藏)求几篇英文文献，谢谢！

文献题目如下：
1、Separation and identification of peptide mixtures in a synthesis crude of carbetocin by liquid chromatography/electrospray ionization mass spectrometry
V. Sanz-Nebot *, I. Toro, A. Garcés, J. Barbosa

2、 天然产物中的多肽的分离、分析及其药用价值
ISOLATION, ANALYSIS AND MEDICINAL VALUE OF POLYPEPTIDES IN THE NATURE
    <<内蒙古医学院学报 >>2004年02期
    杨兆勇 , 王文礼 , 苏秀兰
3、Liquid chromatography–mass spectrometry approach for the characterization and purification of crude synthetic peptide hormones

Victoria Sanz-Nebot1 Contact Information, Fernando Benavente1, Isabel Toro1 and José Barbosa1
    Analytical and Bioanalytical Chemistry
      Volume 377, Number 2 / 2003年9月

4、Optimization of HPLC conditions for the separation of complex crude mixtures produced in the synthesis of therapeutic peptide hormones
Auteur(s) / Author(s)
SANZ-NEBOT V. (1) ; BENAVENTE F. (1) ; TORO I. (1) ; BARBOSA J. (1) ;
nternational Symposium on Chromatography No23, London , ROYAUME-UNI (01/10/2000)
2001, vol. 53, SUPBIS (382 p.)  (48 ref.), pp. S167-S173

5、pKa values of peptides in aqueous and aqueous–organic media: Prediction of chromatographic and electrophoretic behaviour
Journal of Chromatography A, Volume 942, Issues 1-2, 4 January 2002, Pages 145-156
V. Sanz-Nebot, I. Toro, F. Benavente, J. Barbosa

6、Separation of potentially therapeutic peptide hormones by liquid chromatography: Optimisation of the composition and pH of the mobile phase
Journal of Chromatography A, Volume 870, Issues 1-2, 18 February 2000, Pages 335-347
V. Sanz-Nebot, I. Toro, J. Barbosa