PT  - JOURNAL ARTICLE
AU  - Pornchai Rojsitthisak
AU  - Wisut Wichitnithad
AU  - Ongart Pipitharome
AU  - Kingkan Sanphanya
AU  - Peeracha Thanawattanawanich
TI  - Simple HPLC Determination of Benzalkonium Chloride in Ophthalmic Formulations Containing Antazoline and Tetrahydrozoline
DP  - 2005 Sep 01
TA  - PDA Journal of Pharmaceutical Science and Technology
PG  - 332--337
VI  - 59
IP  - 5
4099  - http://journal.pda.org/content/59/5/332.short
4100  - http://journal.pda.org/content/59/5/332.full
SO  - PDA J Pharm Sci Technol2005 Sep 01; 59
AB  - A simple and rapid analytical procedure for routine quantification of n-C12H25 and n-C14H29 benzalkonium chloride (C-12 and C-14 BKC) homologs in ophthalmic formulations containing antazoline HCl and tetrahydrozoline HCl by high-performance liquid chromatography was developed and validated. The ophthalmic solution samples can be directly analyzed by reversed-phase on HiQ-Sil C18 column (4.6 mm × 150 mm, i.d., 5-μm particle size) with acetonitrile–sodium acetate buffer (pH 5.0; 0.2 M) (70:30, v/v) as mobile phase. UV Detection was carried out at 262 nm. The method was linear over the selected concentration and ranged from 0.03 to 0.10 mg/ml (r2 = 0.9999) and from 0.01 to 0.05 mg/ml (r2 = 0.9979) for C-12 and C-14 BKC homologs, respectively. The mean percent recoveries were 100.2 and 102.6 and the percent CV values were 1.3 and 3.5 for C-12 and C-14 BKC homologs, respectively. The results demonstrated the good linearity, accuracy, and precision. The method was applied to determine two commercial ophthalmic formulations, and the percent label amounts of total BKC contents were found to be 99.7 and 103.2.