• Food Science and Preservation
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• v.2 no.2
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• pp.293-301
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• 1995

Quality changes of Korean native-bee honey were investigated during processing and preseration at different temperature. There were no changes of HMF(Hydroxy methyl furfural) and proline contents, color and diastase activity in Korean native-bee honey, when the honey separated from honey combs at 20$^{\circ}C$ and 40$^{\circ}C$. However, at 50 and 80$^{\circ}C$, browning of Korean native-bee honey was shown, HMF content was increased rapidly and proline content and diastase activity were decreased. There were no changes of chemical composition in Korean native-bee honey during storage at 4$^{\circ}C$ for 6 months. But color was darken and HMF content was increased slowly in Korean native-bee honey during storage at 20$^{\circ}C$. During storage at 30$^{\circ}C$ and 40$^{\circ}C$, HMF content was increased highly, proline content, diastase activity and total acidity was decreased rapidly. It is recommended that Korean native-bee honey is separated from honey comb and purified at less than 40$^{\circ}C$ and stored at 4$^{\circ}C$ through 20$^{\circ}C$.

• Korean Journal of Environment and Ecology
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• v.17 no.3
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• pp.187-200
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• 2003

This study was conducted by China along with the Tumen River, which cuts between of North Korea and China. As a result 92 family, 287 genera, 470 species, 57 variety 4 formas, total 531 taxa of vascular plants were identified. The surveyed area was include the region that had various vegetation such as upper swampy land, seashore dune, a river, a high mountain grassy plain, deciduous tree zone and evergreen coniferous forest zone. The specfic plants which is protected by The Natural Environmental Preseration Act appeared to 6 taxa, and rare and endangered plants conserved by Forestry Administration were found 21 taxa in these areas. Among them Lilium cernum, Jeffersonia dubia, Acanthopanax senticosus could be regarded as very important one for chinese medicine. Picea koraiensis, Larix gmelini var. principis-ruprechtii, Populus koreana, Betula fusenensis, Ulmus pumila, Ledum palustre var. diversipilosum, Rhododendron parvifolium, Vaccinium uliginosum, Astragalus membranaceus, Aquilegia flabellata var. pumila, Carex gotoi, Carex capricornis etc. are not distributed in the South Korea.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.3
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• pp.445-450
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• 2002

This study was performed to evaluate the effect of chitosan addition on shelf life of bread. Four different molecular weights (MW) of chitosan, 1 kDa, 5 kDa, 30 kDa, and 120 kDa were used. The growth of spoilage bacteria was inhibited depending on MW and concentration of chitosan, and most inhibited conditions were 0.1% of 30 kDa and 120 kDa of chitosans. But the growth of yeast and mold showed very weak inhibition. This showed that yeast would grow normaly in the fermentation process of bread. Shelf-life of bread was improved depending on concentration of chitosans at WM 30 kDa and 120 kDa. Antioxidative effect of chitosan was increased with the larger molecular weight and the higher concentration during storage. The preservation of bread by adding chitosan was improved.