Achieving Process Understanding and Control in Film Coating - Pharmaceutical Technology

Latest Issue
PharmTech

Latest Issue
PharmTech Europe

Achieving Process Understanding and Control in Film Coating
The authors describe a QbD study that was performed to optimize a coating system.


Pharmaceutical Technology
Volume 36, Issue 9, pp. s18-s21

Coating tablets involves selecting a specific color and gloss that are used to distinguish a drug product and build brand identity for that product. In addition to the issue of color and gloss, the coating must have appropriate surface-slip properties and adequately adhere to the tablet. The coating process and the materials used in the coating system can be optimized using a quality-by-design (QbD) approach to meet these requirements. The authors describe a QbD study that was performed to optimize a coating system.

Critical quality attributes (CQAs) for a tablet coating are color, slip, gloss, and adhesion. A quality-by-design (QbD) study that uses a statistical design and data analysis can identify the critical process parameters (CPPs) needed to obtain the desired CQAs.


Table I: Quality function deployment for effects of material on coating properties (Spectrablend II Pink, Sensient Pharmaceutical Coating Systems). (ALL TABLES ARE COURTESY OF THE AUTHORS)
CPPs include both the material composition (i.e., formula) and parameters in the coating process. In this study, quality function deployment (QFD) was used to identify the expected effects of material composition on the CQAs. QFD can be used to minimize the number of experiments, which limits experimental error. Based on the QFD shown in Table I, the amount of titanium dioxide (TiO2) and a red dye were identified as the CQAs for color, and it was determined that a mixture design was not necessary to test the effect of material composition on color. Instead, a three-factor full factorial with a center point for color effect was chosen as a practical design of experiment (DOE).


Table II: Experimental coating conditions.
The coating system compositions were studied. The level of red dye (Red 40 Lakes, 12–14% concentrate) and the level of TiO2were varied to set the design space for the color effect. Medium-chain triglyceride (MCT) levels were adjusted to maintain the mass balance. Table II lists the temperature and spray-rate process variables used to test each of the nine coating-system compositions.

A 1200-g batch of placebo tablets was coated with each of the nine coating systems. After spray coating, 3 and 5% weight-gain samples were collected and rolled in the coating pan for additional 5 min. The percentage of weight gain was based on theoretical coating solution consumption and did not account for coating efficiency. A total of 45 coating experiments were conducted, and 90 samples were collected. Samples were tested, with five replicates, for color, gloss, slip, and adhesion.


ADVERTISEMENT

blog comments powered by Disqus
LCGC E-mail Newsletters

Subscribe: Click to learn more about the newsletter
| Weekly
| Monthly
|Monthly
| Weekly

Survey
Which of the following business challenge poses the greatest threat to your company?
Building a sustainable pipeline of products
Attracting a skilled workforce
Obtaining/maintaining adequate financing
Regulatory compliance
Building a sustainable pipeline of products
21%
Attracting a skilled workforce
29%
Obtaining/maintaining adequate financing
8%
Regulatory compliance
42%
View Results
Eric Langer Outsourcing Outlook Eric LangerBiopharma Outsourcing Activities Update
Cynthia Challener, PhD Ingredients Insider Cynthia Challener, PhDAppropriate Process Design Critical for Commercial Manufacture of Highly Potent APIs
Jill Wechsler Regulatory Watch Jill Wechsler FDA and Manufacturers Seek a More Secure Drug Supply Chain
Sean Milmo European Regulatory WatcchSean MilmoQuality by Design?Bridging the Gap between Concept and Implementation
Medicare Payment Data Raises Questions About Drug Costs
FDA Wants You!
A New Strategy to Tackle Antibiotic Resistance
Drug-Diagnostic Development Stymied by Payer Concerns
Obama Administration Halts Attack on Medicare Drug Plans
Source: Pharmaceutical Technology,
Click here