This experiment investigated the effects of feed additives of Sasa quelpaertensis Nakai (SQN) extract on Landrace pigs on economic traits such as the quality, physiological characteristics, and productivity. Sixteen pigs with an average age of 154 days were selected as experimental subjects. The experiment was conducted by dividing the group into eight pigs for the supplementation group, feeding with SQN extract, and another eight for the control group feeding without SQN extract. Water was fed ad libitum. On the 30th day, there was no significant difference between meat quality and productivity. However, the glucose and thyroxine were statistically lower with the supplementation group than with the control group (p<0.05). Also, the levels of creatinine difference between 1.18 ± 0.12 ㎎/㎗ with the supplementation group and 0.70 ± 0.06 ㎎/㎗ with the control group (p<0.05). However, all serum biochemistry values were within a normal range, with no health problems. The present study will help solve the problem of reducing the diversity of plant species in Halla Mountain by increasing the availability of the SQN as a pig feed additive.

This experiment was conducted to investigate the effects of feeding TMR(Total Mixed Ration) with Sasa quelpaertensis Nakai of Jeju cross-bred horses on the body weight and blood composition. Fourteen herds of Jeju cross-bred horses older than 36 months were selected as experimental animals. The experiment was conducted by dividing the herds into seven herds for feeding TMR with 20% Sasa quelpaertensis Nakai(treatment) and another seven herds for feeding TMR without Sasa quelpaertensis Nakai(control) and water were fed ad libitum. In the 12th week, the MPV(mean platelet volume) was statistically significantly higher with Sasa TMR than with control (p<0.05). However, both MPV levels are within a normal range and there were no health problems. With regard to the levels of cholesterol, there was a statistically significant difference between the 33.8±5.9 ㎎/㎗ with individual management and 25.4±8.2 ㎎/ ㎗ with control group (p<0.05). But It are also within a normal range and there were no health problems. In conclusion, feeding TMR with 20% Sasa quelpaertensis Nakai of Jeju cross-bred horses could be utilized as a feeding method for horse.

이 연구에서는 한라산을 포함한 제주도 전역에서 높은 밀도로 자라고 있는 제주조릿대 (Sasa quelpaertensis Nakai) 가 서식지 고도와 수관부 개폐 여부에 따라서 나타나는 식물의 생태학적 특성과 소비자 군집 다양성 변화에 영향을 받는가를 알아보았다. 고도와 상부 식생의 유무에 따라 제주조릿대 군락 네 지점을 선정한 후각 지점에서 자라고 있는 제주조릿대 식물 특성 그리고 소비자 군집 다양성을 통하여 삼중영양 상호작용 (Tritrophic interaction)을 조사 하였다. 조사결과, 고도가 증가하면서 상부 식생이 없어지고 제주조릿대의 잎 면적, 수분함량, 질소함량은 감소하였으며, 밀도와 C/N함량은 증가하였다. 상부 식생이 존재할수록 제주조릿대의 생육특성은 더 좋아졌으며 이를 기주로 하는 초식곤충과 포식자가 증가하였다. 따라서 제주조릿대의 생육조건은 고도에 따른 주변 수관부 개폐와 밀접한 관련을 가지고 있으며 이러한 조건은 소비자 군집과도 밀접한 관련이 있는 것으로 생각한다.

The Sasa quelpaertensis Nakai is a white band on the edge of the leaf, the branch is not split, the stem is small, and the shape of the node is different from that of the inland bamboo (Sasa borealis Makino). It is known as a plant that is highly likely to be used as a resource plant. Various efficacy studies such as antioxidant, anti-obesity, antibacterial and antidiabetic activities have been conducted and developed as functional cosmetics and beverage products. Unfortunately there is little research on the suitability of the product. In order to use S. quelpaertensis as a raw material for food or health functional food, S. quelpaertensis leaves were collected monthly for one year to prepared 70% ethanol extract(SQEP) and water extract(SQWP). After, the content of index component(p-coumaric acid) in SQEP and SQWP was analyzed by HPLC. For the study of the processing properties, the SQWP was prepared considering the content of the index component and extraction yield(%). Also, the stability of index component according to pH(2.5, 4.0, 6.0, 8.0, 10.0) condition and stability of index component according to temperature condition(25℃, 35℃, 40℃) were studied. Through this process ability(properties) study, we suggest that the SQWP may be used as a product material of health functional foods.

Sasa quelpaertensis Nakai is a type of edible bamboo grass distributed on Jeju Island, Korea. S. quelpaertensis has been used as afolk medicine for treatment of a variety of ailments. It has been reported to present biological effects, including anti-inflammatory and antioxidant effects. In this study, we demonstrate that S. quelpaertensis Nakai extract (SNE) rescues immunocytes from gamma radiation-induced apoptosis and oxidative DNA damage. We examined the cytotoxicity, cell proliferation, DNA damage, apoptosis, and generation of reactive oxygen species (ROS) in mice given SNE for 45 days in immune cells. To determine the splenocytes protection capability of SNE, gamma-ray was irradiated to the whole body of C57BL/6 mice. Our results suggest that SNE stimulated the proliferation of splenocytes without cytotoxic effects. In addition, SNE not only decreased DNA damage but also reduced apoptosis of splenocytes, and attenuated the production of ROS generation in hydrogen peroxide-induced splenocytes. Therefore, SNE can protect against gamma radiation-induced damage in mice.

Background : More than 1250 bamboo species, belonging to 75 genera, are distributed all over the world. Sasa quelpaertensis Nakai is a type of bamboo grass widely distributed in Halla mountain, Jeju Island, which has been used as antidiabetic, anti-cancer and anti-inflammatory drugs. In this study, we investigated the antioxidant and antimicrobial activities of Sasa quelpaertensis Nakai leaf extracted with different ethanol concentration and demonstrated the potent bioactivities of the extracts suitable to be used as natural antioxidant compounds or pharmaceutical supplements. Methods and Results : Antioxidant and anti-microbial activities of Sasa quelpaertensis Nakai extracts were studied. At first, different ethanol concentrations (0, 20, 40, 60 and 80%) were compared for determining of the best solvent for extraction of phenolic compounds from Sasa quelpaertensis Nakai. Forty percent Ethanol extract with 990.01±28.9 (mg of gallic acid equivalents/g sample) were the best solvent in the extraction of phenolic compounds. But, 60% ethanolic extracts were highest antioxidant activity appeared such as DPPH radical scavenging (IC50 21.20±0.42 μg/ml), ABTS radical scavenging (IC50 49.85±1.27 μg/ml) and reducing power. However, 80% ethanol extracts showed the strongest SOD like activity. The anti-microbial capacity was screened against Gram positive and Gram negative bacteria, and yeast. Sixty percent and 80% ethanol extracts inhibited the growth of Gram positive bacteria; Bacillus cereus was the most susceptible one with MIC of 125 μ g/ml and 250 μg/ml for the 60% and 80% extracts, respectively. Conclusion : The results of this study show that the extract of Sasa quelpaertensis Nakai can be used as easily accessible source of natural antioxidants and as a possible food supplement or in pharmaceutical industry. However, the components responsible for the antioxidant and antimicrobial activities of both extracts of Sasa quelpaertensis Nakai are currently unclear. Therefore, it is suggested that further works should be performed on the isolation and identification of the antioxidant components in Sasa quelpaertensis Nakai.

Background : Indigenous plant in Jeju island, Sasa quelpaertensis Nakai, belongs to the Bambusoideae and inhabit around Mt. Halla. According to the ancient book such as Dongui Bogam, Sasa quelpaertensis Nakai have been known to possess the antidiabetic, anti-inflammatory, and anti-diuresis effect. However, because of gradual upturning temperature, Sasa quelpaertensis Nakai was spread out to wider area and intrude the habitat that other plant species are growing. Recently, although the study to seek effective use of Sasa quelpaertensis Nakai, the investigation about functional properties has not been taken place enough. Methods and Results : To assess the inhibitory activity of melanin synthesis, we employ the tyrosine as substrate and measure the formation of dopaquione at 490 nm. Firstly, 0.1 mM potassium phosphate buffer and tyrosinase were mixed and incubated at 37℃. After incubating at 37℃, the absorbance rate was measured at 490 nm. The value was compared with positive control, arbutin, and calculated with the rate between sample and control value. Previously, formononetin, glabrene, glabridin, glabrol, artocarbene, dihydromoriin are known as effective substances for whitening. Moreover, the arbutin, which was separated from Arctostaphylos uva-ursi (L.) Sprengel, are widely used in cosmetic field. Arbutin inhibits tyrosinase and tyrosine synthesis, which induce blackish pigmentation. Practically, the Sasa quelpaertensis Nakai leaf ethanol extract depend on different solvent condition, whole extracts showed stronger inhibition than arbutin. Especially, 60% ethanol extract exhibited twice higher tyrosinase inhibitory activity than arbutin, whereas least inhibitory activity was seen in 20% ethanol extract. Conclusion : In this study, a attempt was made to investigate the tyrosinase inhibitory activity of Sasa quelpaertensis Nakai leaves extracted by different solvent condition. In the results, each extracts was prior to arbutin. Yet, 20% ethanol extract was lowest, but on the one hand, 60% ethanol extract demonstrated the highest tyrosinase inhibitory activity.