Optimization of tetanus toxoid ammonium sulfate precipitation process using response surface methodology. Issue 7 (2nd October 2016)

• Record Type: Journal Article
• Authors: Brgles, Marija; Prebeg, Pero; Kurtović, Tihana; Ranić, Jelena; Marchetti-Deschmann, Martina; Allmaier, Günter; Halassy, Beata
• Is Part Of: Preparative biochemistry & biotechnology. Volume 46:Issue 7(2016)
• Page Start: 695
• Page End: 703
• Publication Date: 2016-10-02
• Subjects: Ammonium sulfate precipitation -- design of experiments -- mass spectrometry -- radial immunodiffusion -- tetanus toxoid -- tetanus vaccine; Biochemistry -- Technique -- Periodicals; Biotechnology -- Technique -- Periodicals; Biochemistry -- methods -- Periodicals; Biotechnology -- methods -- Periodicals; 660.6
• DOI: 10.1080/10826068.2015.1135452
• Languages: English
• ISSNs: 1082-6068

Abstract

ABSTRACT: Tetanus toxoid (TTd) is a highly immunogenic, detoxified form of tetanus toxin, a causative agent of tetanus disease, produced by Clostridium tetani . Since tetanus disease cannot be eradicated but is easily prevented by vaccination, the need for the tetanus vaccine is permanent. The aim of this work was to investigate the possibility of optimizing TTd purification, i.e., ammonium sulfate precipitation process. The influence of the percentage of ammonium sulfate, starting amount of TTd, buffer type, pH, temperature, and starting purity of TTd on the purification process were investigated using optimal design for response surface models. Responses measured for evaluation of the ammonium sulfate precipitation process were TTd amount (Lf/mL) and total protein content. These two parameters were used to calculate purity (Lf/mgPN) and the yield of the process. Results indicate that citrate buffer, lower temperature, and lower starting amount of TTd result in higher purities of precipitates. Gel electrophoresis combined with matrix-assisted laser desorption ionization–mass spectrometric analysis of precipitates revealed that there are no inter-protein cross-links and that all contaminating proteins have pIs similar to TTd, so this is most probably the reason for the limited success of purification by precipitation.