Abstract
Impedimetric procedures for estimating total viable bacterial count in commercial carrageenan samples was investigated. The correlation (r) between cfu g-1 and detection time (DT) using conductance was -0·77. A procedure referred to as dilution to extinction, to identify samples with 5000 cfu g-1 or more could not be used impedimetrically, because of excessive frequency of a false-positive response. The primary factor responsible for these drawbacks appeared to be the lag phase which was observed to vary between 2 and 5 h for different samples. A correlation of 0·90 was obtained between cfu g-1 and a three well impedimetric most probable number (MPN). The impedimetric MPN procedure provides an estimate within 16 h as compared to 48 h by the standard plating procedure and it is less labor-intensive.
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