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효소 처리 시간에 따른 진피의 플라보노이드 비배당체 함량 및 항산화 활성 비교
박건희(Geonhui Park),박준영(Jun-Young Park),장윤혁(Yoon Hyuk Chang) 한국식품영양과학회 2019 한국식품영양과학회지 Vol.48 No.5
본 연구는 효소의 종류(Viscozyme, Pectinex)와 효소 처리시간(60, 120, 180분)을 달리하여 제조한 진피 효소처리물의 총 폴리페놀 함량, 총 플라보노이드 함량, 플라보노이드조성과 함량의 변화, 항산화 활성(DPPH 라디칼 소거능, ABTS 라디칼 소거능)을 평가하였다. 총 폴리페놀과 총 플라보노이드 함량은 대조구보다 효소 처리를 하였을 때 유의적으로 높았으며 반응시간이 증가함에 따라 함량이 증가하는 경향을 나타냈다. HPLC 정량분석을 통해 진피의 플라보노이드 배당체(hesperidin, narirutin, naringin)가 효소 처리에 의해 저분자 형태(hesperetin-7-glucoside, prunin)와 비배당체 형태(hesperetin, naringenin)로 전환되었음을 확인하였으며, 반응시간이 증가함에 따라 플라보노이드 배당체 함량이 감소하였고, 저분자 형태의 플라보노이드와 비배당체의 함량은 증가하였다. DPPH 라디칼 소거능과 ABTS 라디칼 소거능은 효소 처리 반응시간이 증가함에 따라 증가하는 경향을 나타냈으며, 총 폴리페놀 및 총 플라보노이드 함량이 높고 플라보노이드 비배당체(naringenin, hesperetin) 함량이 높은 Viscozyme 효소처리물이 Pectinex 효소처리물보다 항산화 활성이 유의적으로 높았다. Viscozyme 효소처리물의 경우 플라보노이드 저분자 형태 및 비배당체 형태와 항산화 활성 간에 높은 상관관계를 나타내었고, Pectinex 효소처리물의 경우 Viscozyme 효소처리물에 비하여 낮은 상관관계가 나타났다. 따라서 본 연구에서 진피 내 존재하는 플라보노이드 저분자 및 비배당체의 함량과 항산화 활성은 강한 양의 상관관계가 나타남을 알 수 있었으며, Viscozyme 처리를 통한 저분자화 및 비배당체화가 진피의 항산화 활성을 높이는 데 Pectinex 처리보다 효과적인 방법임을 확인하였다. The objectives of the present study were to (1) quantify individual flavonoids in citrus peels after enzymatic de-glycosylation (Viscozyme or Pectinex) and (2) elucidate the antioxidant activities of citrus peel after different enzymatic treatment times (60, 120, and 180 min). HPLC analysis showed that enzymatic de-glycosylation of citrus peel resulted in decreased flavonoid glycoside forms (narirutin and hesperidin) and increased aglycone forms (naringenin and hesperetin) as the reaction time increased. Enzymatic de-glycosylation of citrus peel induced significantly increased antioxidant activities compared to the control because of enzymatic de-glycosylation of narirutin and naringin to naringenin and of hesperidin to hesperetin, respectively. Furthermore, Viscozyme treatment of citrus peel appeared to be more effective at increasing the aglycone forms (naringenin and hesperetin) and antioxidant properties than Pectinex treatment. There were significant correlations between flavonoid aglycone contents in citrus peel and antioxidant activities. In conclusion, enzymatic de-glycosylation of citrus peels may enrich aglycones in citrus peel and provide more potent functional food materials by increasing antioxidant activities.
Construction of neurospheroids via surface modified concave microwells
Lee, GeonHui,Lim, Jaeho,Park, JiSoo,Lee, Wonseok,Yoon, Dae Sung,Kim, Soo Hyun,Kim, Myung-Ki,Lee, Sang-Hoon,Kim, Dong-Hwee THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.62 No.-
<P><B>Abstract</B></P> <P>Developing a three-dimensional (3D) neural tissue model is important to comprehensively understand neural development and neuronal degeneration associated with various neurological disorders such as axonopathy and neuronopathy. Here, a new microplatform suitable for constructing neuronal spheroids (neurospheroids) was developed by modulating cell–surface interactions. The inner surface of a polydimethylsiloxane (PDMS) concave microwell array extensively used in <I>in vitro</I> cell aggregation was modified with typical extracellular matrix (ECM) molecules or carbon nanotubes to control neural spheroid formation. Modulating neuronal cell–ECM interactions could tune 3D intercellular interactions and spheroidal functionality. Neurite outgrowth, a neuronal marker for complex interneuronal signaling, was found to be tightly regulated by cell–ECM interactions in a confined space. Furthermore, amyloid-β (Aβ)-induced axonopathy representing a pathological feature of neurodegenerative diseases <I>in vivo</I> was examined in this study to monitor the degeneration of neurite outgrowth and alteration of neuronal morphology in these neurospheroids. The proposed neural tissue model could be used to study various neurodegenerative diseases in the future.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jihun Kim,Geonhui Lee,Hanjin Jo,Wookhyun Park,Yu Shin Jin,Ho Dong Kim,Jaehyo Kim 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12
We suggest a wearable soft robot for post-stroke, hemiplegic patients’ finger rehabilitation and quantitative evaluations on the joint paralysis. The device consists of a pair of gloves. One measures finger positions of the normal side, and the other induces symmetric movements on the affected side by pneumatic force. Ten patients at Brunnstrom stage 3 and 4 from a local hospital participated in this study. They performed Rolyan Stacking Cones 10 times with and without the support of the soft robot. We measured subjects’ proximal interphalangeal angles and air pressures in the pneumatic glove during the exercise to monitor grab/release patterns. The soft robot helped open their paralyzed finger joints by more than 50 degrees on average regardless of Brunnstrom stages. We applied pattern recognition methods on the measurement to quantitatively evaluate the subjects. A support vector machine revealed a misclassification rate of 20%, implying that there were a considerable number of overlapping data sets near the boundary between Brunnstrom stages. K-means method with three clusters suggested a new subject group near the support vector machine border. Thus, we conclude that our wearable soft robot not only provides grab/release guides to post-stroke patients but also provides quantitative information on their finger paralysis supplementary to the existing qualitative assessments.
Autonomous swimming technology for an AUV operating in the underwater jacket structure environment
이계홍,Daegil Park,Geonhui Ki 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
This paper presents the autonomous swimming technology developed for an Autonomous Underwater Vehicle (AUV) operating in the underwater jacket structure environment. To prevent the position divergence of the inertial navigation system constructed for the primary navigation solution for the vehicle, we've developed kinds of marker-recognition based underwater localization methods using both of optical and acoustic cameras. However, these two methods all require the artificial markers to be located near to the cameras mounted on the vehicle. Therefore, in the case of the vehicle far away from the structure where the markers are usually mounted on, we may need alternative position-aiding solution to guarantee the navigation accuracy. For this purpose, we develop a sonar image processing based underwater localization method using a Forward Looking Sonar (FLS) mounted in front of the vehicle. The primary purpose of this FLS is to detect the obstacles in front of the vehicle. According to the detected obstacle(s), we apply an Occupancy Grid Map (OGM) based path planning algorithm to derive an obstacle collision-free reference path. Experimental studies are carried out in the water tank and also in the Pohang Yeongilman port sea environment to demonstrate the effectiveness of the proposed autonomous swimming technology.
Autonomous swimming technology for an AUV operating in the underwater jacket structure environment
Li, Ji-Hong,Park, Daegil,Ki, Geonhui The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
This paper presents the autonomous swimming technology developed for an Autonomous Underwater Vehicle (AUV) operating in the underwater jacket structure environment. To prevent the position divergence of the inertial navigation system constructed for the primary navigation solution for the vehicle, we've developed kinds of marker-recognition based underwater localization methods using both of optical and acoustic cameras. However, these two methods all require the artificial markers to be located near to the cameras mounted on the vehicle. Therefore, in the case of the vehicle far away from the structure where the markers are usually mounted on, we may need alternative position-aiding solution to guarantee the navigation accuracy. For this purpose, we develop a sonar image processing based underwater localization method using a Forward Looking Sonar (FLS) mounted in front of the vehicle. The primary purpose of this FLS is to detect the obstacles in front of the vehicle. According to the detected obstacle(s), we apply an Occupancy Grid Map (OGM) based path planning algorithm to derive an obstacle collision-free reference path. Experimental studies are carried out in the water tank and also in the Pohang Yeongilman port sea environment to demonstrate the effectiveness of the proposed autonomous swimming technology.