our results indicated that hdp solutions between 2.76 and 22.10 mg/ml ( histamine base , 1 to 8 mg/ml ) show no evidence of degradation over a 4-month period when kept at 12 degrees c , unless gas sterilization techniques were used in preparing the solutions bacterial contamination was frequent , and at lower concentrations ( i.e. , between 0.08 and 0.28 mg/ml ) hdp solutions that became contaminated with bacteria showed complete degradation within 9 to 11 wk of their preparation .
C0019588
histamine
C0062740
hdp