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Selective absorption

II. A study of the selective adsorption of optically active alanine derivatives on wool

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Summary

Three dyes were synthesized from D-, L-, and DL-alanine, and studied their dyeing behaviors on wool. In the investigation we found that the D-form of the dyes adsorbed on wool most, the L-form adsorbed least, and DL-form fell in between in their acidic aqueous solutions. In an alkaline solution, however, the difference in adsorption behavior on wool between the optical isomers was not detected. We discussed some conditions which lead to the selective-adsorption behavior of optically active dyes on wool.

Zusammenfassung

Drei Farbstoffe wurden aus D-, L- und DL-Alanin synthetisiert und ihr Färbevermögen für Wolle untersucht. Wir fanden, daß die D-Form der Farbstoffe am besten, die L-Form weniger an Wolle absorbiert wird und die DL-Form in ihren sauren wäßrigen Lösungen dazwischen fällt. In alkalischen Lösungen jedoch wurde kein Unterschied zwischen den optischen Isomeren im Adsorptionsverhalten an Wolle beobachtet. Wir diskutieren die Bedingungen, welche zu dem selektiven Adsorptionsverhalten der optisch-aktiven Farbstoffe auf Wolle führten.

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Author notes

  1. Joichi Koga &  Nobuhiko Kuroki

    Present address: Applied Chemistry Department, University of Osaka Prefecture, Mozu-umemachi, Sakai, Osaka, (Japan)

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    1. Joichi Koga
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    2. Nobuhiko Kuroki
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    With 8 figures in 9 details and 1 table

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    Koga, J., Kuroki, N. Selective absorption. Kolloid-Z.u.Z.Polymere 226, 157–162 (1968). https://doi.org/10.1007/BF02086261

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