Case Studies and White Papers


Published: August 2013
Authors: Yahya Kaya, Greg Piepel, Erdal Caniyilmaz

Experimental design, modeling, and data analysis methods for mixture experiments provide for efficiently determining the component proportions that will yield a product with desired properties. This article presents a case study of the work performed to develop a new rubber formulation for an o-ring (a circular gasket) with requirements specified on 10 product properties. Progress in Rubber, Plastics and Recycling Technology, Vol. 29, No. 3, 2013

Note: If interested, you may contact one of the authors, Greg Piepel, Ph.D., for a copy of the paper.

Publication: Progress in Rubber, Plastics and Recycling Technology

DOE Improves Throughput in Manufacturing of Key Intermediate

Published: July 2013
Author: Steve Collier

Researchers at Codexis , a California-based, worldwide leader in protein engineering, used Design-Expert software to improve the performance of an enzyme. Their DOE rapidly developed an efficient catalytic manufacturing process for manufacturing, resulting in high throughput yield of product with excellent selectivity and purity.

Publication: Pharmaceutical Manufacturing

Published: June 2013
Author: Cheryl Scott

Design of experiments (DoE) incorporates statistical methods and multivariate analysis into microscale chemistry. Controlled experiments help analysts evaluate processes with that involve several variables, such as temperature and osmolality in cell culture processes. Often three variables are studied together, with the results expressed in a three-dimensional response-surface graphs.

Publication: BioProcess International

Published: February 2013
Author: Sara Black

Resin manufacturer Interplastic Corp. Thermoset Resins Div. (St. Paul, Minn.), a major gel coat producer, recently developed a new gel coat with the aid of Design-Expert design of experiments software from Stat-Ease Inc.

Publication: Composites Technology

Optimal Experimental Design with R

Published: May 2012
Authors: Mark Anderson, Wayne Adams

BOOK REVIEW: This book provides guidance on the construction of experiments, including sample size calculations, hypothesis testing, and confidence estimation.

Publication: Technometrics

Framing a QbD Design Space with Tolerance Intervals

Published: May 2012
Author: Mark Anderson

Given the push for Quality by Design (QbD) by FDA and drug agencies worldwide, statistical methods are becoming increasingly vital for pharmaceutical manufacturers. Response surface methods for DOE provide powerful tools to manage the impact of multiple factors and their interactions.

Publication: Pharma QbD

Published: May 2012
Author: Wilson Collier

Researchers at Codexis Laboratories Singapore performed a full-factorial designed experiment with 20 runs to determine the impact of four independent variables on product selectivity during a silylation reaction. The result was a process that delivered 95% selectivity along with an 88% yield.

Publication: Pharmaceutical Manufacturing

Published: March 2012
Authors: Patrick Whitcomb, Mark Anderson

Statistical methods are becoming increasingly vital for pharmaceutical manufacturers. Design of experiments (DOE) is a primary tool for determining the relationship between the factors that have an effect on a process and the response of that process.

Publication: Stat-Ease, Inc.

Published: March 2012
Authors: Zhou Jiang, Kurt Droms, Zhaohui Geng, Susan Casnocha, Zhihua Xiao, Steve Gorfien, Scott Jacobia

Researchers aiming to upgrade a fed-batch process observed that basal and feed media have interrelated impacts on process outcomes (a pairing effect). They did a DOE enabled by Design-Expert software for fed-batch cell culture process optimization.

Publication: BioProcess International

Published: January 2012
Authors: David Stiles, Zhiming Zhang, Pei Ge, Brian Nelson, Richard Grondin, Yi Ai, Peter Hardy, Peter Nelson, Andrei Guzaev, Mark Butt, Klaus Charisse, Verbena Kosovrasti, Lubomir Tchangov, Michael Meys, Martin Maier, Lubomir Nechev, Muthiah Manoharan, William Kaemmerer, Douglas Gwost, Gregory Stewart, Don Gash, Dinah Sah

This article explores a therapeutic strategy for treating Huntington's disease.

Publication: Pharma Qbd