국내 육종 양파 품종별 주요성분의 함량 및 항산화활성 비교

황엄지(Eom-Ji Hwang),이유건(Yu Geon Lee),이형재(Hyoung Jae Lee),조정용(Jeong-Yong Cho),문제학(Jae-Hak Moon) 한국식품과학회 2021 한국식품과학회지 Vol.53 No.4

본 연구에서는 국내 육종 양파[황색(맵시황, 신선황, 연신황, 영보황, 영풍황), 적색(엄지나라), 연녹색(스위트그린)]와 외국 육종양파(황색, 선파워; 적색, 천주적) 간의 일반형질, 주요성분 및 항산화능을 비교하였다. 그 결과, 각 페놀성 화합물과 flavonoid의 성분별 총 함량 및 총 페놀성 화합물과 총 flavonoid 함량에 있어 외래품종인 썬파워를 포함한 6종의 황색양파들 중 영보황이 가장 우수한 값을 보였으며, 적색품종에 있어서는 천주적이 엄지나라보다 약간 높은 함량을 보였다. 총 anthocyan의 함량은 엄지나라가 천주적보다 낮았다. 반면 thiosulfate의 함량은 모든 품종들에 있어 유의차를 보이지 않았으며, pyruvic acid 함량은 황색 양파들 중 영보황과 썬파워가 동일한 정도로 가장 높았고, 적색 품종에 있어서는 엄지나라가 천주적보다 더 높은 함량을 보였다. 그러나 총 당함량에 있어서는 영신황이 썬파워를 제외한 모든 품종들 중 가장 높은 값을 보였다. 그리고 항산화능은 모든 평가항목에 있어 공통적으로 적색품종이 가장 우수하였으며, 환원력에 있어서는 천주적이 엄지나라보다 우수하였으나 DPPH radical scavenging 활성은 천주적보다 엄지나라가 다소 높은 경향을 보였고, ABTS⁺ radical scavenging 활성은 두 품종들 간에 유의차를 보이지 않았다. 황색품종들에 있어서는 신선황과 영보황이 우수한 DPPH radical scavenging 활성을 보였으며, 환원력은 국내산 품종들이 썬파워보다 약간 높은 경향을 보였고, ABTS+ radical scavenging 활성은 영신황이 썬파워보다 높았다. 이상의 결과로부터 국내 육성 품종인 영보황과 엄지나라의 성분학적 및 기능학적 우수성이 부분적으로 제시되어진 바, 본 연구결과가 국산 양파 품종의 우수성 홍보를 위한 유용 자료로 활용되기를 기대한다. The content of major constituents and antioxidant activities of nine onion cultivars, namely yellow domestic cultivars Meapsihwang, Sinsunhwang, Yeonsinhwang, Yeongbohwang, and Yeongpoonghwang, red domestic cultivar Eumjinara, green domestic cultivar Sweetgreen, yellow-introduced cultivar Sunpower, and red-introduced cultivar Cheonjujeok, were compared. Yeongbohwang and Cheonjujeok had the highest total phenolic and total flavonoid contents among the six yellow and two red cultivars, respectively. The red cultivars displayed the highest DPPH and ABTS⁺ radical scavenging activities (DRSAs and ARSAs, respectively) and reducing power (RP). Among all cultivars, Cheonjujeok and Eumjinara had the highest DRSA, while both red cultivars had similar ARSAs. Among the yellow cultivars, Sinsunhwang and Yeongbohwang showed excellent DRSAs. The RP of the domestic cultivars was slightly higher than that of the introduced cultivars. Thus, the domestic cultivar Yeongbohwang exhibited excellent characteristics among the yellow cultivars, while the red cultivars Eumjinara and Cheonjujeok were similar.

토지이용모델의 정합성 향상에 관한 연구

유건화(Geon-Hwa You),이영호(Yeong-Ho Lee),황철수(Chul-Sue Hwang) 대한지리학회 2017 대한지리학회 학술대회논문집 Vol.2017 No.6

도시의 기능 및 공간 구조에 따른 인구의 역동성: 서울시를 사례로

유건화(Geonhwa You),황철수(Chul Sue Hwang) 대한지리학회 2019 대한지리학회 학술대회논문집 Vol.2019 No.11

도시 연구를 위한 시, 공간 클러스터링: 비모수적 접근

유건화(Geonhwa You),황철수(Chul Sue Hwang) 대한지리학회 2019 대한지리학회 학술대회논문집 Vol.2019 No.6

자외선 조사에 의한 수용액 중에 함유되어 있는 엔도설판 alpha, beta, sulfate의 광분해

유건상 ( Keon Sang Ryoo ),김미향 ( Mi Hyang Kim ),이화성 ( Hwa Sung Lee ),황현직 ( Hyun Gick Hwang ) 한국환경과학회 2006 한국환경과학회지 Vol.15 No.11

안동시 저수지에서의 대량 어류 폐사에 대한 원인과 대책에 관한 연구

배수호,황선진,김연정,정철호,김성윤,유건상 한국환경농학회 2023 한국환경농학회지 Vol.42 No.1

This study focused on determining the specific causes and prevention methods of mass fish deaths occurred in five reservoirs (Gagugi, Neupgokgi, Danggokgi, Sagokji, and Hangokji) in Andong-si. For this purpose, a survey of ag-ricultural land and livestock in the upper part of the reser-voirs and analysis of water quality in the reservoir irre-spective of whether it rains or not were conducted. We at-tempted to examine the changes in dissolved oxygen (DO) in the surface and bottom layers of reservoirs and changes in DO depending on the amount of livestock compost and time. Based on the above investigations, treatment plans were established to efficiently control the inflow of con-taminated water into reservoirs. The rainfall and farmland areas in the upper part of the reservoir were investigated using Google and aviation data provided by the Ministry of Land, Infrastructure, and Transport. The current status of livestock farms distributed around the reservoirs was also examined because compost from these farms can flow into the reservoir when it rains. Various water quality pa-rameters, such as phosphate phosphorus (PO4-P) and am-monium nitrogen (NH3-N), were analyzed and compared for each reservoir during the rainy season. Changes in the DO concentration and electrical conductivity (EC) were also observed at the inlet of the reservoir during raining us-ing an automated instrument. In addition, DO was meas-ured until the concentration reached 0 ppm in 10 min by adding livestock compost at various concentrations (0.05%, 0.1%, 0.3%, and 0.5% by wt.), where the concentration of the livestock compost represents the relative weight of rainwater. The DO concentration in the surface layer of reservoirs was 3.7 to 5.3 ppm, which is sufficient for fish survival. However, the fish could not survive at the bottom layer with DO concentration of 0.0-2.1 ppm. When the livestock compost was 0.3%, DO required 10-19 h to reach 0 ppm. Considering these results, it was confirmed that the DO in the bottom layer of the reservoir could easi-ly change to an anaerobic state within 24 h when the live-stock compost in the rainwater exceeds 0.3%. The results show that the direct cause of fish mortality is the inflow of excessive livestock compost into reservoirs during the first rainfall in spring. All the surveyed reservoirs had rel-atively good topographical features for the inflow of com-post generated from livestock farms. This keeps the bot-tom layer of the reservoir free of oxygen. Therefore, to prevent fish death due to insufficient DO in the reservoir, measures should be undertaken to limit the amount of live-stock compost flowing into the reservoir within 0.3%, which has been experimentally determined. As a basic countermeasure, minerals such as limestone, dolomite, and magnesia containing calcium and magnesium should be added to the compost of livestock farms around the reservoir. These minerals have excellent pollutant re-moval capabilities when sprayed onto the compost. In ad-dition, measures should be taken to prevent fish death ac-cording to the characteristics of each reservoir. .

Recovery of Ammonium Nitrogen and Phosphate from the Piggery Wastewater as Struvite and Its Assessment for the Reduction of Water Pollution Through the Field Test

김대익,황선진,배수호,유건상 한국환경농학회 2023 한국환경농학회지 Vol.42 No.2

Excess N and P from the livestock manure applied to farmlands, have entered the water systems and poses a serious threat to the natural environment. Consequently, there has been recent awareness towards the management of livestock manure and its related fields. In this study, piggery wastewater was collected from a piggery in Pohang city, Korea. At 800℃, thermal decomposition of a natural stone, magnesite (MgCO3), yielded powered MgO with particle sizes ranging between 10 to 100 µm. Furthermore, NH4 + -N and PO4 3–-P were recovered as struvite precipitates from the piggery wastewater, by adjusting the pH with MgO and H3PO4. At pH 10, the recovery efficiencies of NH4 + -N and PO4 3–-P were found to be 86.1% and 94.1%, respectively. Using an X-ray Diffractometer (XRD), the struvite in the precipitate was confirmed to be consistent with standard pure struvite. Further, the purity of the struvite precipitate was analyzed using an energy dispersive X-ray (EDX) and thermal gravimetry-differential thermal analysis (TG-DTA), and found to be between 79.2% and 93.0%. Additionally, struvite-containing piggery wastewater and sawdust were mixed in a weight ratio of 2.5:1 and processed into a mature compost. The newly manufactured compost passed all quality standards required for first-class graded livestock composts. Moreover, this compost was sprayed directly onto the soil at the test site, and various parameters of the soil’s effluent, such as total organic carbon (TOC), total nitrogen (T-N), total phosphorus (T-P), and dissolved oxygen (DO), were analyzed and measured. Based on these results, it is determined that the newly manufactured compost can more significantly reduce water pollution than commercial compost

Removal of Heavy Metals from Water Using Chicken Egg Shell Powder as a Bio-Adsorbent

김대익,황선진,김영중,정철호,홍용표,유건상 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.12

Chicken egg shell powder (CESP) was exploited as a bio-adsorbent to get rid of heavy metals such as Pb2+, Cd2+, and Cr3+ from water. The BET surface area, surface image and elemental information, mineral type, and thermal changes of CESP were examined by BET surface analyzer, field emission scanning electron microscope/energy dispersive X-ray spectrometer (FESEM/EDX), X-ray diffractometer (XRD), and thermal gravimetric analysis (TG-DTA), respectively. The batch adsorption experiments of heavy metals on CESP were investigated by varying initial heavy metal concentrations, contact time and CESP dosage. At initial heavy metal concentration of 50?mg/L tested, the adsorption rate of Pb2+ was much faster than Cd2+ and Cr3+ and its removal efficiency showed more than 99% at 2.5?g of CESP dosage and 4?h of contact time. In the studied conditions, the adsorption capacity of CESP followed the order of Pb2+?>?Cr3+?>?Cd2+ in system mixed with three?heavy metals. The experimental data for adsorption kinetics and isotherm were evaluated by using pseudo-first-order and pseudo-second-order kinetic models and Freundlich and Langmuir isotherm models, respectively. The overall outcomes showed that the pseudo-second-order kinetics and the Langmuir isotherm models were applied well to the adsorption experimental data acquired in this study. Through this study, the CESP are thought to be an effective bio-adsorbent material on heavy metals because of the low-cost, the high adsorption capacity, the easy acquisition, and the absence of pretreatment for surface modification.

양파(Allium cepa L.) 첨가 청국장의 제조 및 항산화능 평가

이민지,이유건,조정일,나광출,황엄지,김미승,문제학 한국식품저장유통학회 2014 한국식품저장유통학회지 Vol.21 No.1

양파를 첨가한 청국장 제조 가능성을 평가하고, 제조된 시료들을 대상으로 항산화능을 비교하였다. 먼저 양파의 적정 첨가량을 판단하기 위해 노랑콩과 검정콩 각각의 중량을 기준으로 0, 5, 10, 20, 30%가 되도록 양파를 첨가하여 청국장을 제조한 후 관능평가를 실시하였다. 그 결과, 노랑콩과 검정콩 청국장 모두 20% 양파 첨가 청국장이 높은 기호도를 나타냈다. 그래서 20%의 양파를 첨가하여 제조한 청국장을 대상으로 특정성분의 함량 및 항산화능을 비교ㆍ평가하였다. 그 결과, 양파를 첨가하여 제조한 청국장이 첨가하지 않은 청국장보다 유의하게 더 높은 총 페놀성 및 flavonoid 함량을 나타냈다. 그리고 DPPH radical- scavenging 활성평가에 있어서도 양파를 첨가하여 제조한 청국장이 첨가하지 않고 제조한 청국장보다 더 높은 radical-scavenging 활성을 나타냈다. 또 쥐 혈장 산화에 따른 CE-OOH 생성 억제능 평가에 있어서도 양파 첨가 청국장 추출물을 투여한 쥐혈장이 양파를 첨가하지 않은 청국장 추출물을 투여한 쥐 혈장에 비해 더 높은 산화 억제능을 나타냈다. 이상의 결과들은 양파에 다량 함유된 quercetin을 포함한 flavonoid들과 발효과정 중 생성되는 다양한 페놀성 화합물들에 의한 효과라 판단된다. 본 연구결과가 국산 양파의 가공시장확대 및 청국장 소비의 저변확대를 위한 기초자료로 활용되길 기대한다.

임베디드 디바이스에 기반한 이동로봇의 터치기반 원격제어

노준호,황유건,서용호,양태규 한국정보통신설비학회 2011 정보통신설비학회논문지 Vol.10 No.2