PT  - JOURNAL ARTICLE
AU  - Carazzone, Marilena
AU  - Arecco, Domenico
AU  - Fava, Mario
AU  - Sancin, Paolo
TI  - A New Type of Positively Charged Filter: Preliminary Test Results
DP  - 1985 Mar 01
TA  - PDA Journal of Pharmaceutical Science and Technology
PG  - 69--75
VI  - 39
IP  - 2
4099  - http://journal.pda.org/content/39/2/69.short
4100  - http://journal.pda.org/content/39/2/69.full
SO  - PDA J Pharm Sci Technol1985 Mar 01; 39
AB  - A new type of positively charged filter media was investigated to find out if they were able to retain substances having opposite electrical charges present in solutions of different composition. In addition retention stability and the influence of different operational procedures on the efficiency of the retention was also explored. Two groups of trials were performed, the first group with bacterial endotoxins and the second with bacterial suspensions. The results showed that retention efficiency changed according to operational procedures and composition of the solution. Good efficiency was observed when negatively charged substances were present in distilled water, but did not occur in aqueous solutions containing electrolytes. Positively charged filter media are very interesting, but need careful preliminary studies in order to define their suitability and operational procedures.