Microbiological evaluation of frozen chicken nuggets and strips

الملخص EN

50 samples of frozen chicken nuggets and strips (25 of each) were examined microbiologically.

The mean values of microbiological indices in the frozen chicken nuggets and strips for total aerobic plate counts (cfu / g) were 1.9 × 105 ± 4.7 × 104 ; 7.4 × 104 ± 1.8 × 104 ; Enterobacteriaceae counts were 7.7 × 102 ± 2.1 × 102 ; 1 × 102 ± 1.3 × 10 ; Staphylococcus aureus counts were 5.8 × 103 ± 1.2 × 102 ; 3.4 × 102 ± 3.8 ×10 ; Aerobic spore forming count were 2.7 × 103 ± 1.2 × 102 ; 4.9 × 103 ± 7.8 × 102, The identified aerobic spore forming bacteria were B.

subtilis, B.

cereus, B.

sterothermophilus, B.

lents and B.

coagulans.

The mean value of mould and yeast counts were 6.5 × 10 ± 1 × 10 ; 5 × 102 ± 1.4 × 10, The identified mould genera were Alternaria, Cladosporium, Rhizopus, Aspergillus , Fusarium , pencillium , Mucor, The Aspergillus and Penicillium genera were identified.

The identified yeast genera were Rhodotorula, Deparomyces, Saccharomyces, Candida, Endomyces, Pichia, and Cryptococcus.

The mean value of MPN / g.

of Coliforms were 1.1 × 10 ± 0.3 × 10 ; 3.8 × 10 ± 0.3 × 10, The Incidence of identified Enterobacteriaceae organisms were E.coli 5 (10.6 %), 7(23.3 %) K.

pneumoniae 3(6.3 %), 1(3.3 %), C.

diversus 1(2.1 %), (0 %), C.

freundii 11(23.4 %), 3(10 %), p.

mirabilis 9 ( 19.1 %), ( 0 %), p.

vulgris ( 0 %), 2( 6.6 %), serratia marcescens 7 (14.9 %), 4(13.3 %), Morgenalla morganii 5 (10.6 %), 6(20 %), Enterobacter aerogenes ( 0 %), 4( 13.3 %), Enterobacter agglumerans 4( 8.5 %), (0 %), Edwardsiella tarda 1( 2.1 %), 3 ( 10 %), Shigella spp.(0 %), (0 %) and salmonella spp.

1( 2.1 %), (0 %), respectively.

The isolated serotype of E.

coli were E.

coli O103 : k- 3 (12 %), 3(12 %) and E.

coli O119 : K69 2 (8 %), 4 (16 %).

The isolated serotype of salmonella organisms were S.

pullorum gallinarum 1 (4 %), (0 %) respectively.

In all examined samples the clostridium perfringens couldn’t be detected.