acid 0 10 sodium lauryl ether sulfate 40 0 mackamide c 2 0 mackamide wgb 5 0 deionized water 52 70 in this example two 2 monoethers are use as antimicrobial preservatives in a typical shampoo formulation benzoic acid is used as a synergist to enhance monoether activity against gram negative bacteria glycerol c12 monoether 0 25 by weight glycerol c10 monoether 0 25 glycerol c8 monoether 0 25 benzoic acid 0 10 lanolin usp 10 0 white bees wax 5 0 fionsolv tn 5 0 white petroleum usp 79 15 in this example a combination of three 3 monoethers is used to preserve a typical moisturizing ointment base that can be used as a skin moisturizer or as a pharmaceutical ointment base to carry active drug agents pgc 12 monoether 1 0 by weight pgc 8 monoether 1 0 lactic acid 1 0 ethanol 97 00 this example shows the use of a combination of propylene glycol c8 monoether and the pgc 12 monoether with lactic acid as a synergist dissolved in ethanol to make a liquid moisturizing skin disinfectant drug product the ethanol alone is an excellent skin antiseptic but has the drawback of being extremely drying to the skin the monoethers add two advantages over plain ethanol along with the lactic acid synergist they help prevent drying of the skin and they leave a long lasting antimicrobial film on the skin in contrast plain ethanol alone evaporates quickly from the skin and therefore has no.