• The Korean Journal of Food And Nutrition
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• v.7 no.2
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• pp.128-136
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• 1994

Mackerel muscle protein hydrolysates, which were prepared from defatted mackerel meal by proteases such as complex enzyme, alcalase, bromelain, pancrease, pepsin, w-chymotrypsin, trypsin and papain, were tested for the antioxidative action against linoleic acid. Among proteases tested, the hydrolysates obtained from the treatment of complex enzyme, bromelain and alcalase showed higher antioxidative effects. Also, the hydrolysates showed the synergistic effects with o-tocopherol and the inhibitory effects for peroxidation of metal ions(Fe3+, Cua+) From the profiles of fractionation of the hydrolysates with Bio-gel P-2 column, the most active fractions, part I(complex enzyme-derived) and part e(bromelain-derived), had below MW 1,400 and the antioxidative effects were closely related to the binding capacity with metal ion(Cua+). Amno acid composition of the part I was abundant in histidine, arginine, phenylalanine and lysine, and the part e was abundant in lysine, glutamic acid and leucine.

• KSBB Journal
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• v.8 no.4
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• pp.370-374
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• 1993

In transportation the amount of metal ion by crown ethers, dibenzo-18-crown-6 were investigated using ultraviolet spectrometer. Transported the amount of one valence metal ion as $K^+ and Li^+}$ was not so much. On the other hand, two valence metal ion increased by dibenzo-18-crown-6, which means that the ionic charge and hydration of two valence metal ion affected the carrying ability of crown ethers. The carrying ability of dibenzo-18-crown-6 was, therefore, adequate for two valence metal ion as $Ca^{2+}$ and $Ba^{2+}$. It was also suggested that transport metal ion by crown ethers, which is related rather the catching ability than the selectivity of metalion.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.8
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• pp.1318-1322
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• 2003

This study was carried out to identify the biophysical utility of bioflavonoids by the determination of their antioxidative activities, radical scavenging activity and inhibitory effect on the ACE activity. The results obtained were as follows; All flavonoids experimented greatly inhibited the linoleic acid oxidation from the early period of oxidation, and the radical scavenging ability was also greater in genistein and daidzein than other flavonoids, generally showing donating ability. Rutin has the metal-chelating ability with C $u^{2+}$ and $Mg^{2+}$, which means to have the inhibitory effect on the promotive oxidation of lipid by metal ion. All flavonoids experimented inhibited the angiotensin converting enzyme (ACE) activity, which was greater in genistein and daidzein than other flavonoids.s.

• KSBB Journal
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• v.10 no.4
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• pp.374-385
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• 1995

Nutritional requirements and cultural conditions for the production of extracellular gelatin-degrading proteolytic enzyme by Bacillus subtilis B0021 were investigated. Optimum carbon source for proteolytic enzyme production was salicin, but it was substituted by glucose for economical reason. The fermentation medium giving a maximum proteolytic enzyme activity was consisted of 1.5%(w/v) glucose, 2.5%(w/v) yeast extract, and 0.001%(w/v) manganese sulfate and 0.002%(w/v) ferrous sulfate. Proteolytic enzyme activity of B. subtilis B0021 was completely inhibited by 0.5%(w/v) tannic acid. Initial pH was optimal at 7.0 and the enzyme activity in the flask culture usually reached a maximal level after 36 hours of fermentation at $30^{\circ}C$. In the $5\ell$ fermentor fermentation at $30^{\circ}C$, enzyme activity was maximum at 36 hour of cultivation but after this enzyme activity was decreased rapidly. Initial viscosity of 45%(w/v) gelatin(2,800mPas) was decreased rapidly to 96%(mPas) after hydrolysis for 4hr at $40^{\circ}C$ by crude enzyme of B. subtilis B0021.