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Characterization of a carbon composite electrode for an electrochemical immunosensor
구기갑,Eun Chan Cho,Byong Ok Jang,Eui Jung Kim 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
A bioactive platform with a carbon composite electrode was developed for rapid detection of Escherichia coli O157:H7. The porous carbon composite electrode was prepared by a sol-gel method with a mixture of graphite powder and tetraethyl orthosilicate/ethanol. Escherichia coli O157:H7 antibodies were physically adsorbed onto the carbon composite electrode. Direct measurements by cyclic voltammetry and electrochemical impedance spectroscopy in the presence of [Fe(CN)6]3−/4− as a redox probe showed that the immobilization of antibodies onto the carbon composite electrode surface and the binding of Escherichia coli O157:H7 cells with antibodies systematically increased the electron-transfer resistance. Those results suggest that a sol-gel derived graphite composite electrode might be utilized as a label-free electrochemical immunosensor for diagnosis, biochemical research, food industry, and so on.
( Jung Hyun Kwon ),( Jeong Won Jang ),( Seoung Ok Lee ),( Sun Hong Yoo ),( Byong Sun Oh ),( Min Joo Kim ),( Kyu Won Chung ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Backgrounds: The role of quantitative HBsAg or HBeAg levels in patients receiving oral antiviral therapy is controversial. This study aimed to determine whether serial monitoring of HBsAg and HBeAg levels could predict virologic or serologic responses to entecavir therapy. Methods: A total of 260 consecutive CHB patients treated with entecavir for more than one year were analyzed. Serum level of HBsAg, HBeAg and HBV DNA were serially assessed at baseline and 4-12 weeks intervals. Results: 180 were HBeAg positive, and the mean treatment period was 129±54.2 weeks. There was an overall decline in HBsAg levels from baseline to year 1 and to year 2 in HBeAgpositive patients (3.7±0.8 vs. 3.5±0.8 vs. 3.3±0.9 log IU/ml, respectively, p<0.05). However, HBeAg-negative patients had no significant changes in HBsAg levels, although their levels were lower than those in HBeAg-positive patients. Patients with baseline HBsAg levels <3.5 log IU/ml were more likely to achieve undetectable HBV DNA at week 24, year 1, and year 2 than patients with HBsAg levels >3.5 log IU/ml. Neither HBsAg at week 12 nor 24 was predictive of HBeAg seroconver sion or undetectable HBV DNA. Unlike HBsAg levels, HBeAg levels exhibited a distinct decline from baseline to week 4 and thereafter (p<0.001). There was a significant rapid decrease in HBeAg levels during therapy among HBeAg seroconversion as well as virologic response groups (p<0.05). A more than 1 log decrease in HBeAg levels at week 12 was a significant predictor of HBeAg seroconversion and undetectable HBV DNA in HBeAg-positive patients. Conclusions: Despite the marked HBV DNA suppression, entecavir therapy does not result in a significant decline in HBsAg levels up to year 2 for prediction of HBeAg seroconversion and undetectable HBV DNA in the majority of patients. However, an early decline in HBeAg levels is associated with HBeAg seroconversion and virologic suppression.
열풍 건조한 돼지감자 분말의 영양성분 및 이화학적 특성 분석
김하늘(Ha-Neul Kim),유석영(Seok-Yeong Yu),윤원병(Won-Byong Yoon),장선민(Sun-Min Jang),장용진(Yong-Jin Jang),이옥환(Ok-Hwan Lee) 한국식품과학회 2014 한국식품과학회지 Vol.46 No.1
본 연구는 돼지감자를 이용한 가공식품 개발 시 돼지감자에 대한 기초자료를 제공하고자 돼지감자의 영양성분 및 이화학적 특성을 분석하였다. 돼지감자의 수분함량은 5.06±0.08%, 조회분 5.04±0.03%, 조단백질은 8.30±0.26%, 조지방 0.70±0.16%, 탄수화물은 80.90%이었다. 돼지감자의 총당 함량은 50.48±1.11 mg/g 이었다. 색도를 측정한 결과 L값은 94.16±0.03, a값은 0.32±0.01, b값은 0.30±0.01로 측정되었다. 돼지감자의 수분결합능은 4.04±0.16 g/g, 수분활성도는 0.245±0.005였다. 돼지감자의 총 아미노산은 1.337×104 mg/kg였고, 그 중 필수아미노산의 함량은 2,737 mg/kg였다. 아미노산 중 histidine이 7,305 mg/kg로 가장 많았고 leucine이 184.16 mg/kg로 가장 적은 양을 함유하고 있었다. 유리당은 fructose를 0.8%, maltose는 3.2% 함유하고 있었으며 지방산은 linoleic acid가 0.21%로 가장 높은 수치를 나타냈다. 무기질 함량은 K함량이 2,489 mg%로 가장 많이 함유되어 있었으며, 돼지감자의 비타민 C 함량은 3.43±0.07 mg%으로 측정되었다. 총 페놀 함량과 총 플라보노이드의 함량은 3.06±0.07 mg GAE/g, 1.89±0.03 mg QE/g으로 나타났다. This study investigated the nutritional components and physicochemical characteristics of Jerusalem artichoke. The moisture, crude protein, crude fat, crude ash and carbohydrate content of the Jerusalem artichoke were 5.06±0.08, 8.30±0.26, 0.70±0.16, 5.04±0.03, and 80.90%, respectively. The total sugar content of Jerusalem artichoke was 50.48±1.11 mg/g, and the Hunter color space coordinates were L=94.16±0.03, a=0.32±0.01 and b=0.30±0.01. The water binding capacity and water activity of the Jerusalem artichoke were 4.06±0.16 g/g and 0.245±0.005, respectively. The total aminoacid content of the Jerusalem artichoke was 1.337×104 mg/kg, and essential amino acid was 2,737 mg/kg. The total free sugar of the Jerusalem artichoke was 4.12%. Linoleic acid (0.21%) was found to be a common fatty acid in the Jerusalem artichoke. Among the minerals, potassium (2,489 mg%) was found to be the most abundant in the Jerusalem artichoke. The total phenol and flavonoid contents were 3.06±0.07 mg GAE/g and 1.89±0.03 mg QE/g, respectively. The vitamin C content of the Jerusalem artichoke was 3.43±0.07 mg%.
Jwa-Kyung Sung(성좌경),Sung-Yong Park(박성용),Su-Yeon Lee(이수연),Ye-Jin Lee(이예진),Ju-Young Lee(이주영),Byong-Choon Jang(장병춘),Hyun-Gwan Goh(고현관),Yong-Sik Ok(옥용식),Tae-Wan Kim(김태완),Beom-Heon Song(송범헌) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.1
오이의 부위별 생체분석을 통하여 영양진단 가능성을 검토코자, 무기영양액의 양분농도가 결핍된 조건(1/10 Ross 용액) 하에서 오이의 생육, 무기성분의 흡수 및 탄수화물 합성에 관하여 조사하였다. 양분결핍에 의한 오이 생육저해는 처리 후 20일에 나타났다. 양분결핍조건에서 질산태 질소의 흡수는 정상조건에 비해 크게 감소하였으며, 질산태 질소함량은 잎보다 엽병과 줄기에서 높았다. 반면, 암모늄태 질소함량은 생장엽병 및 생장엽에서 뿌리보다 높았다. 양분결핍에 의한 칼리 부족은 생장엽에서 나타났다. 칼슘은 처리간에 유의적인 차이를 보이지 않았으며, 주로 엽병에 분포하였다. 마그네슘은 줄기나 뿌리보다는 잎에 다량 존재하였으며, 나트륨은 칼리와 유사한 경향을 보였으나 함량은 매우 낮았다. 이산화탄소 동화율은 정상 양분조건의 완전생장엽에서 가장 높았으며, 양분결핍조건과 비교할 때 약 1.7배 컸다. 수분이용효율은 처리간에 유의적인 차이는 보이지 않았으나, 정상 양분조건에서 약간 높았다. 수용성 당 함량은 잎에서 가장 높았고, 엽병, 줄기 및 뿌리의 순으로 나타났으며, 오래된 조직보다는 어린 조직에서 높았다. 정상 양분조건의 생장엽에서 측정된 수용성 당 함량은 약 7,200 ㎎ ㎏?¹ 이었다. 무기성분과 수용성 당과의 상관관계를 알아본 결과, 마그네슘과 암모늄태 질소가 수용성 당과 고도의 정의 상관관계를 보였다. We investigated the growth of cucumber plants, the uptake and use of mineral nutrients, such as NO₃?N, NH₄?N, K?, Ca??, Mg?? and Na?, absorbed from media solution, and the synthesis and distribution of soluble sugars under nutrient-deficient condition. Difference in plant growth revealed after 20 days of treatment. Nitrate uptake in nutrient-deficient condition was significantly reduced compared with nutrient-normal treatment, and its distribution was primarily in petioles, stem, roots and less inleaves. In contrast, ammonium content was markedly predominated in fast growing organs, and it was significantly different in growing leaves, expanded leaves, and roots under similar growth conditions. K?, lack by deficient nutrient condition, was found in growing leaves. The Ca?? content did not show significant difference between treatments and a substantial portion of Ca?? remained in petioles. The Mg?? content was significantly higher in the leaves of nutrient-normal condition compared with nutrient-deficient condition while significantlylower in stem and roots. The behavior of Na? in plant was similar to K? although its content was relatively little. The highest CO₂ assimilation was observed in fully expanded leaves of nutrient-normal condition, which was 1.7 times higher compared with nutrient-deficient condition. The instantaneous water use efficiency (A/E) and the A/gsratio, which is an index of leaf intrinsic water use efficiency for individual leaves, was 1.2 and 1.1 times higher, respectively. The total soluble sugar (TSS) contents were highest in leaves followed by petioles, stems and roots, and in younger leaves. The growing leaves contained about 7,200 ㎎ ㎏?¹ of TSS in nutrient-normal condition whereas the TSS contents in nutrient-deficient condition were not significantly different between leaves. The Mg?? and NH₄? N were positively correlated with the TSS whereas NO₃? N was negatively correlated.