影像科学与光化学 ›› 1989, Vol. 7 ›› Issue (4): 1-5.DOI: 10.7517/j.issn.1674-0475.1989.04.1

• 研究论文 •    下一篇

圆二色光谱法研究某些助剂对明胶大分子的多级结构的影响

熊良文, 彭必先   

  1. 中国科学院感光化学研究所, 北京 100012
  • 收稿日期:1987-12-23 修回日期:1989-06-15 出版日期:1989-11-20 发布日期:1989-11-20
  • 通讯作者: 熊良文

A CD STUDY OF THE EFFECT OF SOME PHOTOGRAPHIC ADDITIVES ON THE MULTIPLE STRUCTURE OF GELATIN MACROMOLECULE

Xiong Liang-wen, Peng Bi-xian   

  1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100012, P.R. China
  • Received:1987-12-23 Revised:1989-06-15 Online:1989-11-20 Published:1989-11-20

摘要: 本文采用圆二色法研究了KCNS、NH4CNS、硫脲、脲等化学增感剂(或助剂)对照相明胶的圆二色性光谱(以下简称为圆二色性)的影响,根据圆二色性的数据,来推断这些试剂对照相明胶的多级结构的影响。实验结果表明:这些试剂对明胶的圆二色性的影响是很强烈的,不同试剂不仅影响的程度不一样,而且影响的方式也不尽相同。比如:对明胶的240nm附近的负槽圆二色性的影响,在KCNS、脲的浓度的增大过程中圆二色性先是减小,经过一个最低值,然后又增加;在NH4CNS的浓度增大过程中,圆二色性一直是增大的;在硫脲浓度增大的过程中,圆二色性却是迅速减小的,很快就减小到零。不管上述助剂各自对明胶的圆二色性影响怎样,但它们都有一个共同点,就是:改变或部分改变了明胶的多级结构。

关键词: 照相明胶, 助剂, 多级结构, 圆二色性光谱

Abstract: The effect of some photographic additives, such as potassium thiocyanate, ammonium thio-cyanate, thiourea and urea on the multiple structure formation of photographic gelatin was investigated by circular dichroism (CD) method. The experimental results showed that the above-mentioned additives have a very strong influence on the CD of photographic gelatin, but they differ from each other in extent and manner. In the case of potassium thiocyanate and urea, with the increase of their amount, CD value first deceases gradually, through a minimum, finally increases again. In the case of thiourea, with the increase in amount the CD value decreases very fast, and finally approaches zero. In contrary to thiourea, ammonium thiocyanate exhibits a monotomic increasing tendency of CD value. All these different effects were attributed to the two contradictory factors: one decreasing CD by the additives and the other increasing CD by foreign Cotton Effect.

Key words: photographic gelatin, additive, multiple structure, circular dichroism