الفهرس 
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Abstract
One hundred and eighty samples of cheese (Ras, Damietta and areish) and plain yoghurt, 45 from each were collected from dairy
ps,supermarkets and markets at different localities of Alexandria ity and its suburbs. Collected samples were subjected to chemical
nd bacteriological examination and transferred to the laboratory under aseptic condition with a minimum of deiay.
Chemical examination:
Biogenic amines (mean values):
Eight amines; histamine, tyramine, putrescine, cadaverine, spermidine, spermine, phenylethylarnine and gmatine could he detected by HPLC.
ogenic axnines Damietta Kareish Plain
(mgI 100 g)Ras cheese cheese cheese yoghurt
listamine 7.12 1.57 2.37 0.67
3.22 3.03 5.2ü
3.88 2.51 6.94 2.84
Cadaverine 3.00 1.63 6.36 2.03
0.76 0.51 0.71 0.53
Ijpermine0.91 0.61 0.48 0.63
ienylethylamine 1.94 1.22 0.43 0.44
matine 0.48 0.06 0.17 0.09.