K Nn mK - Amecamex.org.mx

Such results satisfactory covered the requirements stablished by the NOM for spray dried products
for children from 1 year old and up.
FSB1 – 2004
Food Science and Biotechnology in Developing Countries
Microbiological assays.
The results obtained from the different microbiological assays may be seen in the next table:
Table 2. Beverage Microbiological Assay Results
ACCOUNT OF: RESULTS
Aerobic Mesophilic Plate UFC/g Negative
Total Coliforms (NMP/g) Negative
Staphylococcus aureus Negative
Salmonella spp in 25 g Absence
Mold and yeasts 50 UFC/g
Microbiological assays were necessary to evaluate the product safety, specially when it is done
for covering essential requirements for children development (NOM-131-SSA1 1995). Aerobic
Mesophilic Plate count was negative, the stablished limits by the NOM –159-SSA1-1996
estipulates that the maximum permited number is 2500 UFC/g of aerobic mesophilics.
Coliforms count for the NMP Method also resulted negative indicating that contamination post-
thermal treatment was absence. It was good because the NOM –131 –SSA1-1995 marks that the
maximum number accepted for Coliforms is 20NMP/g for dehydrated foods.
The count of Staphylococcus aureus alsoresulted negative. In this case may be observed that the
management of the beverage was adequate.
The NOM –131-SSA1-1995 stablishes that Salmonella count most be reported as absence in 25 g
of the examinated food. Consequently, the egg-milk based powder beverage was inside the
specifications of the regulation because Salmonella count resulted negative.
V.- CONCLUSIONS
About process conditions for drying, the safest and most adequate temperature at 140°C
was fixed.
Presence of kappa carragenine in the formulation permited to obtain a pleasant texture as well
as a good general acceptance.
The blends among food hidrocolloids resulted apropiated for the beverage purpose. Solubility
was the first characteristic improved. Using maltodextrine, soy lecthin and kappa carragenine the
flavor had a better acceptance.
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