• Korean Journal of Medicinal Crop Science
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• v.15 no.4
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• pp.266-270
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• 2007

This research was conducted to investigate antioxidant activities of Juglans mandshrica forages by the irradiation of far infrared ray during leaf drying processes before compound extraction, with its potential use for activating antioxidants. The contents of total phenolics and flavonoids in the basis of a gram leaf dry weight were maximized in 20 min at 30 V of far infrared irradiation. Total phenolic content was 25.43 mg/g in the FIR treatment, while it was 21.12 mg/g in the non-FIR treatment control. Total flavonoid content was 39.38 mg/g in the FIR treatment, while it was 32.78 mg/g in the non-FIR treatment control. The contents were decreased when the condition of far infrared ray irradiation was higher voltage and longer treatment time, exhibiting 16.93 mg/g of total phenolics and 23.78 mg/g of total flavonoids in 30 min at 50 V of far infrared irradiation. The antioxidant activities were shown to positive relationships with the contents of total phenolics and total flavonoids. In this study, we concluded that content of bioactive molecules relating antioxidant activity in Juglans mandshrica forages is optimized in 20 min at 30 V of far infrared irradiation for leaf drying process.

• Journal of Conservation Science
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• v.1 no.1 s.1
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• pp.12-26
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• 1992

Ilsan peat-bed site, newly constructed city area, is located at the northern part of Seoul. This site is situated near the mouth of Han river, which flows through central Korea. Many fossil woods were excavated from this site, and surveyed the wood anatomical features. Totally 90 specimens were identified into 10 species including two roots and five barks which were not identified in detail. Alnus japonica and A. maxmowiczii are the most common and occupied 26. 7%, 34.4% of the total specimen number respectively, and then other species which excavated from Ilsan area are follows : Fraxinus rhynchophylla(18.9%), Lepido-balanus spp.(3.3%), Maackia amurensis(2.2%), Diospyros spp.(2.2%), Juglans mandshrica(1.1%), Prunophora spp.(1.1%), Malus or Pyrus spp.(1.1%), Rhamnus spp.(1.1%). Among the identified species there are fairly some species growing in the central - or northern temperate zone, such as A. maxmowiczii, F. rhynchophylla, Lepidobalanus spp., M. amurnsis, J. mandshurica, Rhumnus spp. Therefore, it can be estimated that the former temperature of Ilsan area was same or slightly cold than today. The species bearing fruit for food as .J, mandshunca, Diospyros spp., Prunophora spp., Mulus or Pyrus spp. were regarded as artificially planting trees, because they do not grow together in the same site.