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Ammonios

(᾽Αμμώνιος), teacher and commentator on Aristotle; born Alexandria late 5th C., died after 517. Ammonios imbibed paganism from his philosophically minded parents; after the death ...

Zwittergent

Zwittergent   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
83 words

...the proprietary name for any of a group of zwitterionic detergents containing a betaine and a sulfonate group; such molecules retain their amphoteric (zwitterionic) properties over a very wide range of pH. The formula is n ‐alkyl N , N ‐dimethyl‐3‐ammonio‐1‐propanesulfonate. In Zwittergent 3‐08, alkyl is octyl (CMC 330 mm); 3‐10, decyl (aggregation number 41, CMC 25–40 mm); 3‐12, dodecyl (aggregation number 55, CMC 2–4 mm); 3‐14, tetradecyl (aggregation number 83, CMC 0.1–0.4 mm); 3–16, hexadecyl (aggregation number 155, CMC 0.01–0.06...

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