• 대한소아치과학회지
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• 제51권2호
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• pp.149-164
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• 2024

This study compared the solubility, water absorption, dimensional stability, release of various ions (hydroxyl, calcium, sulfur, strontium, and silicon), and cytotoxicity of light-cured resin-modified pulp-capping materials. Resin-modified calcium hydroxide (Ultra-blend^TM plus, UBP), light-cured resin-modified calcium silicate (TheraCal LC^TM, TLC), and dual-cure resin-modified calcium silicate (TheraCal PT^TM, TPT) were used. Each material was polymerized; solubility, 24-hour water absorption, and 30- day dimensional stability experiments were conducted to test its physical properties. Solubility was assessed according to the ISO 6876 standard, and 24 hours of water absorption, 30 days of dimensional stability were assessed by referring to the previous protocol respectively. Eluates at 3 and 24 hours and on 7, 14, and 28 days were analyzed according to the ISO 10993-12 standard. And the pH, Ion-releasing ability, cell proliferation rate, and cell viability were assessed using the eluates to evaluate biochemical characteristics. pH was measured with a pH meter and Ion-releasing ability was assessed using inductively coupled plasma atomic emission spectrometry (ICP-AES). Cell proliferation rate and cell viability were assessed using human dental pulp cells (hDPCs). The former was assessed by an absorbance assay using the CCK-8 solution, and the latter was assessed by Live and Dead staining. TPT exhibited lower solubility and water absorption than TLC. UBP and TPT demonstrated higher stability than TLC. The release of sulfur, strontium, calcium, and hydroxyl ions was higher for TLC and TPT than for UBP. The 28-day release of hydroxyl and silicon ions was similar for TLC and TPT. TLC alone exhibited a lower cell proliferation rate compared to the control group at a dilution ratio of 1 : 2 in cell proliferation and dead cells from Live and Dead assay evaluation. Thus, when using light-cure resin-modified pulp-capping materials, calcium silicate-based materials can be considered alternatives to calcium hydroxide-based materials. Moreover, when comparing physical and biochemical properties, TPT could be prioritized over TLC as the first choice.

• 한국식품조리과학회지
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• 제2권2호
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• pp.16-20
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• 1986

무우 속의 매운 맛 성분을 용매추출법 ($CCl_4$,사용)으로 분리하여 RP-HPLC법에 의해 정제한 후에 관능검사에 의해 pungency test를 하고, UV spectrum분석, GC/MC 분석을 수행한 결과 4-methylthio-3-butenyl isothiocyanate 임을 확인하였다. RP-HPLC에서 mobile Phase로 70% acetonitrile을 사용하였는데, 정제된 4-methylthio-3-butenyl isothiocfanate는 단일 peak로 분리되어 나왔고 이때의 retention time은 5.2분이였다. 아울러 RP-TLC에서 Rf치는 0.9이었다.

• 한국식품영양학회지
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• 제25권4호
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• pp.968-973
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• 2012

This study analyzes the structure types of salmon oil to evaluate the purity of salmon oil products based on the 38 different types of imported salmon oil products distributed in the Republic of Korea. The major types of omega-3 foods in the salmon oil are ethyl ester (EE) and triglyceride (TG). If the salmon oil contained potential contaminants and was processed in order to remove it, EE type omega-3 fatty acids are found in concentration. This provides a good guide in assessing if products were made with EE type ingredients or re-esterified contaminated materials. The results of the FT-IR analysis showed significant difference in the C=O, C-O band positions in TG and EE. There were 19 TG type products and 19 EE type products. The analysis of carbon isotope ratio was performed on the types of TG and EE. There were different properties in the 19 TG type products. In one product, the carbon isotope ratio was -25.15 and the other 18 products showed -22.15~-23.96. The carbon isotope ratio of all 19 EE type products showed -21.91~-23.74. The results of the TLC analysis showed similar results with FR-IR. The re-esterified TG form was not detected in the TG type products, confirming that the TG type products contained natural salmon oil. This study aimed to provide the basic material in classifying the types of natural salmon oil and re-esterified salmon oil, by analyzing the pattern and proportion of FT-IR spectrum, carbon isotope ratio, and TLC.

• 생약학회지
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• 제39권3호
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• pp.179-185
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• 2008

Three species, such as Rheum palmatum L., R. tanguticum Maxim. and R. officinale Baillon are recognized as the source plants of Rhei Rhizoma in Korean Pharmacopeia. However, other herbal sources such as R. undulatum L. and Rumex crispus L. have been often misused as Rhei Rhizoma. A pattern analysis method to discriminate Rhei Rhizoma in Korean Pharmacopeia from other herbal plants using HPLC and TLC chromatograms was developed. The multivariate peak data of the chromatograms of methanol extracts of Rhei Rhizoma were used for hierarchical clustering analysis, principal components analysis and similarity calculation. Besides of the statistic analysis, TLC patterns of samples could be used as criteria of the discrimination. The developed pattern analysis method was specific and could be readily utilized for comprehensive evaluation of Rhei Rhizoma.

• International Journal of Internet, Broadcasting and Communication
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• 제8권3호
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• pp.63-68
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• 2016

This thesis proposed an objective and accurate fundamental numeric data for the economics and business analysis of applicable CCS technology to plant using existing fossil fuel by analyzing the influence of process improvement for commercialization of Carbon Capture and Storage(CCS) technology, which enables storing $CO_2$ generated by fossil fuel by extracting before emitting to air and press until it becomes liquid, and development and performance improvement of new solvent on Total Life Cycle Cost(TLC) of CCS.

• 식물병연구
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• 제15권1호
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• pp.46-50
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• 2009

Cytochalasin E (CE) is a secondary metabolite secreted by Rosellinia necatrix, caused by white root rot, and has toxicity to apple as a toxin during disease progress. This study was conducted to demonstrate the relationship between the production of CE and its pathogenicity. CE producing isolates and non-producing isolates of R. nectatrix were isolated from the mycerial mat of diseased roots and was detected on that using a TLC and HPLC analysis and in vivo pathogenicity test. CE non-producing isolates were not pathogenic to apple roots and not detected CE by TLC and HPLC analysis. It was shown that the production of CE was related to the pathogenicity of R. nectatrix.

• 월간한국양록
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• 14호
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• pp.12-21
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• 1991

Several experiments were carried for the purpose of establishing the basis for the quality evaluation of deer horn. Deer horn originated from China, New Zealand, Soviet and Alaska were used as objectives and some constituents involved in deer horn were as

• 한국식품영양과학회지
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• 제32권7호
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• pp.1164-1167
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• 2003

국내 유통 중인 한약재에 발암물질로 알려진 aristolochic acid 함유 여부를 검사하고자 방기, 목통, 목향, 마두령, 세신, 철목향 등을 대상으로 aristolochic acid 검출 유무 및 정량분석을 수행하였다. 시료에 대한 TLC와 $C_{18}$ column을 이용한 HPLC의 aristolochic acid 최적 분석 조건을 수립하였고 aristolochic acid 정량분석 결과 방기 type II에는 3.9 mg/g, 마두령에는 2.3 mg/g이 함유되어 있는 것으로 나타났다. 그외 목향, 목통, 세신, 청목향 등 시료에서는 aristolochic acid가 검출되지 않았다.

• 한국식품과학회지
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• 제34권6호
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• pp.1145-1148
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• 2002

뇌의 송과선에서 분비되는 호르몬인 melatonin은 생체의 산화적 손상을 방어하는 효능이 있다고 알려져 있는데, 26종의 식물체로부터 그 존재 및 함량을 분석하였다. Melatonin 함유 분획을 조제하기 위하여 동결건조된 식물체 분말을 50% ethanol로 추출한 다음 여과 후 TLC 상에서 acetone으로 전개시켜 melatonin을 분리하였다. 형광하에서 확인된 melatonin spot은 methanol로 추출한 다음 HPLC로 분석하였다. HPLC 분석시 ODS-A column을 사용하였으며 이동상은 70% ammonium acetate와 메탄올을 30 : 70(v/v)으로 섞어서 1.0 mL/min의 속도로 흘려주었다. Melatonin peak의 확인은 형광 detector를 이용하였으며 retention time은 17분이었다. 이같은 분석조건에서 셀러리, 부추, 브로콜리, 컬리플라워 등에서 높은 melatonin 함량이 확인되었다.

• Journal of the Korean Wood Science and Technology
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• 제31권1호
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• pp.16-21
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• 2003

느릅나무 근피의 메탄올 추출물을 분획하여 항균성을 측정한 결과 항균력이 가장 우수한 수용성 분획을 silicagel column chromatograpy 및 TLC에 의해 분리·정제한 다음 정제 화합물을 UV, IR, ¹H-NMR, ¹³C-NMR를 사용하여 구조를 동정하고 그 화합물의 항균력을 검정하였다. 수용성 분획물로부터 두 종류의 정제 화합물을 단리하였다. 기기분석 결과, 화합물 B는 Catechin rhamnoside로 확인되었다. 단리된 정제화합물은 Staphylococcus aureus 및 Salmonella typhimurium에 대하여 항균활성을 나타내었다.