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| 1 | Synthesis of highly fluorescent carbon dots from lemon and onion juices for determination of riboflavin in multivitamin/mineral supplements显示文摘In this work, lemon and onion biomasses commonly found in street markets are for the first time used to develop a facile, fast and low-cost one-step microwave-assisted carbonization method for synthesis of highly fluorescent carbon dots (CDs). The structure and optical properties of CDs were investigated by TEM, XRD, XRF, UV-Vis, FTIR, and fluorescence spectroscopy. CDs displayed satisfactory optical pro-prieties, a high quantum yield of 23.6%, and excellent water solubility, and the particle size was 4.23-8.22 nm with an average diameter of 6.15 nm. An efficient fluorescent resonance energy transfer (FRET) between the CDs and riboflavin was achieved with CDs acting as donor and riboflavin as acceptor. A linear relationship between FRET and the riboflavin concentration from 0.10 to 3.0 μg/mL was observed, allowing the development of an accurate and fast analytical method to determine this vitamin in multivitamin/mineral supplements. Despite the potential interferences in these supplements, CDs were selective for riboflavin under optimized conditions. A paired t-test at a 95% confidence level indicated no statistically significant difference between the proposed and the reference methods. Recovery test presented values ranged from 96.0% to 101.4%. The limit of detection and relative standard deviation were estimated at 1.0 ng/mL and <2.6% (n = 3), respectively. CDs were successfully synthesized in a domestic microwave oven (1450 W, 6 min), presenting satisfactory parameters when compared with results of other studies reported in the literature, suggesting that the proposed method is a potentially useful method for the synthesis of CDs and determination of riboflavin. | Severino S. Monte-Filho Stefani I.E. Andrade Marcelo B. Lima Mario C.U. Araujo | 2019 | Journal of Pharmaceutical Analysis2019，9，3： | 4 |
| 2 | Screening analysis of natural gas with respect to methane content by near-infrared spectrometry显示文摘 | Hebertty V. Dantas Mayara F. Barbosa Elaine C.L. Nascimento Pablo N.T. Moreira Roberto K.H. Galv?o Mário C.U. Araújo | 2014 | Microchemical Journal2014，，： | 1 |
| 3 | Tobacco use among medical professionals in Kerala, India: The need for enhanced tobacco cessation and control efforts显示文摘 | Sailesh Mohan A.S. Pradeepkumar C.U. Thresia K.R. Thankappan W.S.C. Poston C.K. Haddock Megan M. Pinkston Myra L. Muramoto Mimi Nichter Mark Nichter Harry A. Lando | 2006 | Addictive Behaviors2006，，12： | 1 |
| 4 | Partial oxidation of methane to H 2 and CO over Rh/SiO 2 and Ru/SiO 2 catalysts显示文摘 | Q.G. Yan T.H. Wu W.Z. Weng H. Toghiani R.K. Toghiani H.L. Wan C.U. Pittman | 2004 | Journal of Catalysis2004，，2： | 1 |
| 5 | Chemical and sensory evaluation of germinated cowpeas ( Vigna unguiculata ) and their products显示文摘 | A.C. Uwaegbute C.U. Iroegbu O. Eke | 1999 | Food Chemistry1999，，2： | 1 |
| 6 | Cell mediated and antibody immune response to inactivated hepatitis A vaccine显示文摘 | P. Schmidtke P. Habermehl M. Knuf C.U. Meyer R. S?nger F. Zepp | 2005 | Vaccine2005，，44： | 1 |
| 7 | Surface acid property and its relation to SCR activity of phosphorus added to commercial V2O5(WO3)/TiO2 catalyst显示文摘 | Hiroyuki Kamata Katsumi Takahashi C.U. Ingemar Odenbrand | 1998 | Catalysis Letters (-)1998，，1： | 1 |
| 8 | 孤立性二叶式主动脉瓣患儿中升主动脉进行性扩张 | Holmes K.W. Lehmann C.U. Dalal D. 赵君 | 2007 | 世界核心医学期刊文摘(心脏病学分册)2007，0，8： | 1 |
| 9 | Photobioreactors for mass cultivation of algae显示文摘 | C.U. Ugwu H. Aoyagi H. Uchiyama | 2007 | Bioresource Technology2007，，10： | 1 |
| 10 | W.施太格缪勒在当代德国认识论中的作用显示文摘1960年至1970年间,在德国,对于那些对科学哲学或分析哲学有兴趣的人来说,他们的目标自然是W.施太格缪勒领导下的慕尼黑大学的哲学研究所。这个研究所最初被称作“哲学家研讨会”,后来与慕尼黑大学统计学系合并,这个研讨会就成为“科学理论与统计学研究所”,而那些大学生们则干脆地称呼“在施太格缪勒那儿”。这里要指出的是, | C.U.穆利内 张伯霖 蒋闻芳 | 1988 | 世界哲学1988，，2： | 0 |
| 11 | Metal Organic Chemical Vapour Deposited Thin Films of Cobalt Oxide Prepared via Cobalt Acetylacetonate显示文摘The single solid source precursor, cobalt (Ⅱ) acetylacetonate was prepared and characterized by infrared spec-troscopy. Thin films of cobalt oxide were deposited on soda lime glass substrates through the pyrolysis (metal organic chemical vapour deposition (MOCVD)) of single solid source precursor, cobalt acetylaceto-nate, Co[C5H7O2]2 at a temperature of 420℃. The compositional characterization carried out by rutherford backscattering spectroscopy and X-ray diffraction (XRD), showed that the films have a stoichiometry of Co2O3 and an average thickness of 227±0.2 nm. A direct energy gap of 2.15±0.01 eV was calculated by the data obtained by optical absorption spectroscopy. The morphology of the films obtained by scanning electron mi-croscopy, showed that the grains were continuous and uniformly distributed at various magnifications, while the average grain size was less than 1 micron for the deposited thin films of cobalt oxide. | C.U. Mordi M.A. Eleruja B.A. Taleatu G.O. Egharevba A.V. Adedeji O.O. Akinwunmi B. Olofinjana C. Jeynes E.O.B. Ajayi | 2009 | Journal of Materials Science & Technology2009，25，1： | 0 |
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