SCIENTIFIC STUDIES ON THE CLEANSING OF DRINKING GLASSES

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Abstract
It is shown that, under laboratory conditions, various quarternary ammonium compounds have high bactericidal action against such organisms as might contaminate drinking glasses; thus, using 1:12,800 concentration of didecyl dimethylammonium bromide, 2 min. exposure killed 99% of bacteria in a mixed culture of such organisms. However, high bactericidal value is associated with a high destructive effect for beer head-retention properties. In practice it is necessary to choose compounds with a somewhat lesser bactericidal value and a lesser effect on foam. Good results have been obtained in the laboratory with cetyl β-picolinium bromide and with tetradecyl pyridinium bromide at 1:6,000 concentration, the latter being preferred on grounds of availability. The favourable preliminary results have been confirmed in actual glass-washing experiments, and the avail ability is noted of a dispenser which would ensure the correct concentration of detergent being maintained in wash-bowls.

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