Two biodegradable quaternary ammonium salts were synthesized and used as cationic collectors in processing iron ores by froth flotation. The flotation behaviors of iron minerals with the new biodegradable quaternary ammonium collectors were investigated by micro-flotation tests of quartz (SiO2) and magnetite (Fe3O4). It was observed that the new biodegradable collectors were effective in separa...

■ ■ 80% reduction in analysis time enables high throughput analysis IN T RODUC T ION Benzalkonium Chloride (BAC) refers to a series of quaternary ammonium chloride homologues with the structure shown in Figure 1. The pervasive use of BAC in consumer products results from its antiseptic and antifungal properties with widespread applications ranging from cleaning products and disinfectants to san...

Quaternary ammonium compounds are an important class of molecules with wide variety of applications, mainly in the antimicrobial field. Quaternary ammonium compounds have the ability to bind with the anionic moiety of phospholipids of the bacterial membrane, disrupting the cell membrane of the microorganisms. However, classical quaternary ammonium salts can have adverse effects on the environme...

TO THE EDITOR—How best to evaluate the effect of quaternary ammonium compound–based products after detection of postflood bacterial and fungal air bioburden remains uncertain. Thammasat University Hospital (Thailand) closed after severe black-water flooding in 2011; significant resources and costs were associated with hospital closure, reparations, and tiered reopening of select units [1]. In a...

Mycobacterium tuberculosis has enjoyed the distinction, among the nonspore bearing organisms, of being one of the most resistant to chemical disinfection. Quaternary ammonium compounds, widely used as effective germicides against gram positive organisms, have generally proved to be without effect on the tubercle bacillus (Lawrence and Grover, 1951; Smith et al., 1950). Recently, it has been rep...