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98
we]l as the final product were so examined in addition to the
routine methlylene blue test on the ice cream and mix samples.
The results of samples taken from the Manufacturer in auestion
are summarised below:-
Ice crean and Ice cream Mix Total No. of Samples - 48
Methylene Blue Test - Grade 1 - None
Grade 2 - 33
Grade 3 - 10
Grade 4 - 5
Plate Count - Total No. of Samples - 30
Total Count Highest 2,500 cols/ml.
Lowest less than
100 cols/ml.
Bact. Coli All less than
100 cols/ml.
Ingredients and Plant
A heat resistant organism found in 5 samples of skimmed milk
powder out of 11 submitted and in a packing gland in the homogeniser
was identified as bacillus cereus. The countries of origin
of the skimmed milk powder were Australia, New Zealand. Eire and
England.
The fact that the total count for these samples was predominantly
low tends to confirm what is already maintained by
laboratory workers in this field that even small numbers of this
organism can influence the methylene blue gradings, therefore if
its incidence in an important ingredient of ice cream is as high
as suggested by this isolated example some revision in the interpretation
of methylene blue results would appear to be desirable.
INSPECTION OF FOOD
Inspection at Shops, Stores Factories and Wharf
Large quantities of food of all varieties were inspected
and as a result the following food was surrendered as unfit for
human consumption and unsound food certificates were issued.