• Food Science and Preservation
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• v.9 no.3
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• pp.345-350
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• 2002

This study was carried out to determine the effect of gamma irradiated Puerariae radix extract on color removal, antioxidative, DPPH radical scavenging and antimicrobial efftcts. Puerariae radix were extracted with methanol and acetone and irrdiated 10, 20 and 30 kGy with gamma ray. Hunter color L-value increased by irrdiation in a dose dependent manner, resulting in brighter color. But a and b values decreased by irradiation in a dose dependent manner. Antioxidant activities of the Puerariae radix extract in soybean oil emulsion were higher in methanol extract than acetone extract. Scavenging effect of Puerariae radix extracts on DPPH radical with methanol was not changed by irradiation but acetone decreased Acetone extract from Puerariae radix showed antimicrobial activities in B. subtilis, B, natto, B, megaterium S, aureus, Sal, typhymurium and E. coli methanol extract also had the antimicrobial activities but weaker for Sal. typhymurium and E. coli. Results suggested that Puerariae radix extracts have a potential as a natural food preservatives and cosmetic raw material.

• Food Science and Preservation
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• v.9 no.3
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• pp.292-297
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• 2002

This studies were carried out to investigate the effect of Prunus mume Sie. extract on growth of lactic acid bacteria isolated from kimchi and preservation of kimchi. Prunus mums Sie. extract inhibited the growth of homofermentative lactic acid bacteria and heterofermentative lactic acid bacteria isolated from kimchi. In early storage stage, the pH of Prunus mume Sie. extract added kimchi(PEAK) was lower than that of control. The pH of PEAK was higher than that of control after 25 days of fermentation. Titratable acidity, viable cell of total bacteria and lactic acid bacteria of the PEAK were lower than that of control during fermentation. The sensory quality of 1% PEAK was similar to control at 10 days of fermentation But overall acceptability of 3% PEAK decreased compare with l% PEAK.

• Current Research on Agriculture and Life Sciences
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• v.3
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• pp.79-84
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• 1985

This research was attempted in order to develop a long-term storage method for sprouting foods such as potatoes, onions, garlic and chestnuts using Co-60 gamma irradiation combined with a natural low temperature. The sprouting of the irradiated groups, 150 Gy in potatoes, 50 Gy in onions and garlic, and 250 Gy in chestnuts was almost completely inhibited until 8 to 10 months of storage. The rotting rate of loss of weight influenced a little by irradiation with a sprout inhibiting dose, and the weight of loss of the optimum dose irradiated groups was reduced by about 6 to 24% as against that of the nonirradiated in the four stored foods. The chemical components relating to the quality of sprouting foods were better retained in the irradiated groups than in the nonirradiated until the latter period of storage. Therefore, it was shown that the long term storage of sprouting foods is possible using gamma irradiation of 50 to 150 Gy for potatoes, onions, and garlic and 250Gy for chestnuts followed by storage at a natural low temperature($10{\pm}5^{\circ}C$, R.H. 75-85%).

• Food Science and Preservation
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• v.5 no.3
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• pp.299-304
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• 1998

Screening for antibacterial activities with microorganisms related to the food putrefaction by ethanol extract from Chrysanthemum petals widely used for the traditional wine production, and antibacterial activities of each concentration and minimum inhibitory concentration(MIC) from the ethanol extract were researched. Antibacterial activity of ehanol extract for B. subtilis was higher in C. boreale than in C. Morifolium, but that of E. coli was higher in C. molifolium than in C. boreale. C. boreale was higher than C. morifolium in the antibacterial activity of ehanol extract and MIC of ehanol extract from C. boreale was 60-70${\mu}\ell$/ml. Ethanol extract from C. boreale was higher Gram(-) than Gram(+) in the antibacterial activities, but Gram(-), Gram(+) were greatly inhibited on growth in 100${\mu}\ell$ concentration.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.3
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• pp.477-481
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• 2001

A large quantity of fat is added in processing of emulsion sausage. It is bring about deterioration and toxic substance by oxidation. Antioxidants are generally used as a protection material of oxidation for a storage and preservation of foods. In terms of stability of foods and health of human, development of a high effective antioxidants in a natural is required. Chitosan which is made from chitin by processing of deacetylase, has various function of antibiosis, antimutation and antioxidation and so on. We studied about the antioxidation of chitosan using to emulsion sausage. As a results, antioxidative effects of chitosan were increased with th large milecular weight and the higher concentration. M.W. 30,000 and M.W. 120,000 of chitosan have more 20% of antioxidation effect in emulsion sausage. Because chitosan have not 100% of antioxidation effect, we concluded that it has synergy effect by using with other natural material which has an effect of antioxidation.

• KSBB Journal
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• v.17 no.4
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• pp.350-356
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• 2002

Low density polyethylene(LDPE) film was fabricated with the addition of benzoic acid, or/and JP which contained water-soluble silica adsorbed a natural antimicrobial compounds. The used antimicrobial compounds were isolated from culture broths of methylotropic actinomycetes strains MO-16 and MO-17 which was newly isolated from soils. An antimicrobial compound retained antimicrobial activity after heat treatment at 121$^{\circ}C$ for 5 min. JP, which obtained from Japan as a antimicrobial agent, showed antimicrobial activity in the concentration of 100 mg/mL. The silica LDPE film revealed the growth inhibition of total aerobic bacteria in packaged minced pork compared with commercial film and of E. coil on a contained agar plate. In the storage testing of various packaged foods at room temperature for 30 days, the film showed excellent preservation compared with commercial film in case of small tomato and Agaricus bisporus.

• Food Science and Preservation
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• v.8 no.4
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• pp.462-468
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• 2001

To develop natural food preservative, antimicrobial activity of Pinus densiflora Sieb. et Zucc. (PD) ethanol extract against pathogens were investigated. The growth of pathogens such as Staphylococcus aureus ATCC 29737, Bacillus subtils KCTC 1021, Bacillus megaterium KCTC 3007 and Vibrio parahaemolyticus ATCC 17802 was inhibited as much as 4 to 6 log cycle in tryptic soy broth containing 40mg/㎖ of PD extract but Salmonalla typhimurium ATCC 14028 and Pseudomonas fluorescens ATCC 21541 were not inhibited. The total, gram negative and psychrotrophic bacterial count were inhibited in minced pork containing 40mg/㎖ of PD extract for 20 days at 4$\^{C}$. The sensory quality of hamburger patty such as taste, flavor and overall acceptability were not decreased by the addition of 40mg/㎖ PD(p<0.05).

• Journal of the Korean Society of Food Science and Nutrition
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• v.24 no.5
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• pp.707-712
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• 1995

Natural antimicrobial activities in leaf mustard Dolsan(Brassica juncea) were evaluated for food preservation. Antimicrobial activities and changes in volatile allylisothiocyanate(AIT) concentration were examined during incubation of leaf mustard homogenate for 72 hours at $30^{\circ}C$. The concentration of volatile AIT was highest at 2 hours of incubation. Antimicrobial activities, which were insignificant in raw homogenate without incubation, were occurred at 21 hours and were showed highest at 48~72 hours of incubation. Water-pretreated extract(WPE) showed the antimicrobial activity by 1.2~1.4 times higher than the water extract. Ethylacetate fraction of leaf mustard showed high antimicrobial activities. The WPE had strong antimicrobial activities against Salmonella typhimurium and Staphylococcus aureus. Heat treatment of the WPE for 30 min at $121^{\circ}C$ did not lose the antimicrobial activities.

• Korean Journal of Food Science and Technology
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• v.37 no.1
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• pp.50-54
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• 2005

Antimicrobial activities of ethanol extracts of marta rosemary (Rosemarinus officinalis L.) against Bacillus subtilis and Salmonella typhimurium were investigated under conditions similar to processing of general food materials to develop natural food preservatives. The strongest antimicrobial activities were shown against the tested organisms at pH 7. In B. subtilis, the herbal extract extended the lag phase at low concentrations, and reduced the specific growth rate during logarithmic phase at high concentrations. In S. typhimurium the herbal extract reduced the specific growth rate even at lower concentrations. These trends were obtained at low pHs of culture solution. Antimicrobial substances of herbs were efficiently extracted with low polar solvents. The thermal stability of antimicrobial substances decreased with heating time at $100^{\circ}C$. S. typhimurium was more sensitive to herbal extracts at $100\;and\;121^{\circ}C$ than B. subtilis.

• Journal of the Korean Society of Food Science and Nutrition
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• v.34 no.8
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• pp.1130-1135
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• 2005

The objective of this study was to evaluate the antimicrobial activity of four herb extracts from lavender, patchouli, rosemary and eucalyptus possibly used as food preservatives. Minimum inhibitory concentration of France rosemary extracts was 29.1 mg/mL against C. albicans ATCC 10231 and 14.5 mg/mL against B. subtilis ATCC 6613 and E. coli ATCC 25922. Both of France rosemary and American lavender herbal extracts were thermally stable between 40$^{\circ}C$ and 121$^{\circ}C$ and were stable at only neutral pH. Microbial growth was repressed by adding 2.9 mg of a commercial herbal extracts in 20 mL liquid medium with France rosemary extracts and American lavender extracts.