Abstract:
In this research, biogenic amines (BAs) assay in fermented foods by enzymatic method using
coupling enzymes between amine oxidase (AO) from the roots of soybean seedlings and
bromoperoxidase (BPO) from marine red algae (Graci/aria changii) was developed. Amounts of
biogenic amines were detected from levels of products established from a bromination reaction
between phenol red, a substrate of BPO. Enzyme coupling assay was specific for putrescine,
cadaverine, histamine, tryptamine, tyramine and ~-phenylethylamine. The contents of biogenic
amine in fermented foods were determined from the standard curve of putrescine. From the results,
the suitable acid for extraction BAs from fermented meat and Thai fermented sausage, was 3 M
perchloric acid (PCA) and 1.5 M PCA was suitable for fermented rice while 4 M hydrochloric acid
(HCl) was suitable acid for extraction of biogenic amines from fermented fish and fermented shell.
The ratio of sample and acid was 1:2 (w/v). Average of % recovery, of three times extraction, of
putrescine, cadaverine and histamine in fermented foods was 74.80,64.65 and 50.60%, respectively.
BAs contents of nham, Thai fermented sausage, fermented rice, fermented fish and fermented shell
were 340.70, 267.21, 183.33, 432.06 and 381.06 mg/kg, respectively. According to the results,
fermented meat had the highest BAs content, followed by fermented vegetable, fermented beverage
and fermented milk and milk product, respectively. The shelf life of reaction mixture for
determination of biogenic amines could be prolong in the liquid form by adding glycerol or
polyethylene glycol as stabilizer or in the lyophilized form. The shelf life of BAs test kits could be
prolong by storage at least 4?C to stabilize enzyme activity that were more stable than storage at
10C and 25C.