Application Note: Instrumental method for quantitation of colour in drug solutions
EP Colour is used to assign a colour rating to liquid samples indicative of the product quality. The original intent of using EP Colour was to improve colour communication over more ambiguous word descriptors such as ‘slightly yellow’ by visual comparison to a fixed set of 37 transparent EP liquid colour standards, all of which are yellow.
As defined in European Pharmacopoeia Method 2.2.2, the visual EP Colour Scale consists of three primary colour standard solutions (yellow, red and blue) combined with a dilute hydrochloric acid solution to make five standard colour solutions – B (brown), BY (brownish-yellow), Y (yellow), GY (greenish-yellow) and R (red) that are subsequently diluted with hydrochloric acid (10g/l HCl) to make 37 reference EP liquid colour standards – 9B, 7BY, 7Y, 7GY and 7R.
This application note is restricted - login or subscribe free to access
Thank you for visiting our website. To access this content in full you'll need to login. It's completely free to subscribe, and in less than a minute you can continue reading. If you've already subscribed, great - just login.
Why subscribe? Join our growing community of thousands of industry professionals and gain access to:
- bi-monthly issues in print and/or digital format
- case studies, whitepapers, webinars and industry-leading content
- breaking news and features
- our extensive online archive of thousands of articles and years of past issues
- ...And it's all free!
Related content from this organisation
- A comprehensive review of the newly revised European Pharmacopoeia chapter 5.1.6
- Foreword: The evolving pharmacopoeia
- Whitepaper: Feasibility of a Rapid Microbiological Method for filterable raw materials
- Application Note: Instrumental method for quantitation of colour in drug solutions
- Rapid methods update: revisions to a United States Pharmacopeia chapter