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De Beer, T.R., Alles, O.M., Goethals, F., Coppens, A., Vander Heyden, Y., Lopez De Diego, H., Rantanen, J., Verpoort, F., Vervaet, C., Remon, J.P. and Baeyens, W.R.G. (2007) Implementation of a Process Analytical Technology System in a Freeze-Drying Process Using Raman Spectroscopy for In-Line Process Monitoring. Analytical Chemistry, 79, 7992-8003.
http://dx.doi.org/10.1021/ac070549h

has been cited by the following article:

• TITLE: Quality by Design: Impact of Product Variables and Their Interaction on the Particle Size in Lyophilization of Sodium Fluoride

  AUTHORS: V. K. Mourya, Yogesh Choudhari, Mangeshkumar Padame

  KEYWORDS: QbD, PAT, Lyophilization, Particle Size

  JOURNAL NAME: Soft Nanoscience Letters, Vol.6 No.1, January 29, 2016

  ABSTRACT: The aim of present study was to use QbD approaches to evaluate the effect of independent product variables and their interaction on particle size of sodium fluoride and then obtain the optimized experimental condition for predefined particle size of sodium fluoride. The sodium fluoride is mainly used in dental preparation for delivering the fluoride ion to the tooth enamel for that nano-particle size is required. Nowadays the milling process is used to reduce the particle size. But that process has some limitations due to crystalline nature of sodium fluoride; for overcoming those limitations, lyophilization method is used. A 43 level full factorial design was used to study the significant influence of process and product variables i.e. 1) Concentration of sodium fluoride, 2) Concentration of PVP, 3) Sample volume, 4) Drying surface, on particle size of sodium fluoride. The experimental design result shows that independent product variables significantly modify the structure and improve particle size reduction of sodium fluoride.