Vitamin A-Active Substances

Vitamin K Substances

Vitamin K comprises a group of substances, which are widespread in nature and are an essential co-factor in humans in the synthesis of several proteins that play a role in haemostasis and others that may be important in calcium homeostasis. The K vitamins all contain the 2-methyl-1,4-naphthoquinone (menadione) moiety, and the various naturally occurring forms differ in the alkyl substituent at ...

Medical Uses: Biologically Active Substances

Investigation of Chiral Active Substances

Status Last revised 1993 Previous titles/other references Clinical Investigation of Chiral Active Substances/ III/3501/91 Additional Notes This note for guidance considers active substances with one or more stereogenic centres which display chirality but not constitutional isomerism or cis/trans isomerism. It should be read in conjunction with Directive 65/65/EEC as amended and Directive 75/318...

Substances Related to Vitamin A in the Whale Liver Oil

Fig. I. Absorption spectra of vitamin Ai (Ai), vitamin A2 (A2), subvitamin A (S), kitol (K), anhydrovitamin Ai (Ai'), anhydrovitamin A2 (AD and anhydrosubvitamin A (S'). to isolate kitol having the absorption maximum at 290 mμ.1> Furthermore, substances related to vitamin A such as anhydro vitam:ln A and subvitamin A have been confirmed in ordinary fish liver oils. Also in the whale liver oil, ...

Increasing the Efficacy of Electrolyte Active Substances

An adjuvant composition containing a) one or more alkyl glucamides of the formula (I), wherein R1 represents a linear or branched alkyl group having 5 to 9 carbon atoms, R2 represents an alkyl group having 1 to 3 carbon atoms; b) at least one water-soluble ammonium salt, preferably selected from the group consisting of ammonium sulfate, ammonium nitrate, ammonium nitrate urea, ammonium phosphat...