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Makoto Watanabe Masanori Morita Makoto Sakurai Mioko Maeda 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6-7):1823-1826
Preparations of small-ring and short-chain condensed phosphates were made by dry and wet processes, respectively. The crystallization of tetra- hexa-, and octaphosphates from the phosphate solution was not easy, and metal salts of these oligophosphates were amorphous and unstable at normal temperature. Guanidine tetraphosphate and ammonium hexaphosphate were crystalline and stable at normal temperature. 相似文献
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Hiroshi Nagai Minami Watanabe Shingo Sato Mioko Kawaguchi Yue-Yun Xiao Kazutaka Hayashi Ryuichi Watanabe Hajime Uchida Masayuki Satake 《Tetrahedron》2019,75(17):2486-2494
The marine cyanobacterium Moorea producens is a rich source of diverse compounds that possess a variety of biological activities. In the present study, eight new aplysiatoxin derivatives, namely 6, 8–13, and 15, along with aplysiatoxin (1), debromoaplysiatoxin (2), 3-methoxyaplysiatoxin (3), anhydroaplysiatoxin (4), anhydrodebromoaplysiatoxin (5), oscillatoxin B2 (7), and 30-methyloscillatoxin D (14) were isolated and identified from the Okinawan M. producens. In cytotoxicity and diatom growth inhibition tests, the fifteen compounds tested (1–15) showed moderate or no activity at a concentration of 10?μg/mL. 相似文献
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The utility of Diels–Alder derivatization with 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) for liquid chromatography/electrospray
ionization tandem mass spectrometry of conjugated linoleic acids (CLAs) was examined. PTAD rapidly reacted with the CLAs,
and the resulting derivatives were highly responsive in electrospray ionization mass spectrometry operating in the positive-ion
mode. The derivatives produced characteristic product ions during tandem mass spectrometry, which enabled the sensitive detection
[limit of detection 18 fmol (signal-to-noise ratio of 5)] and the identification of the conjugated diene position. The PTAD
derivatization also significantly increased the reversed-phase liquid chromatography separation selectivity for the most biologically
active CLA isomers: cis-9,trans-11-CLA and trans-10,cis-12-CLA. The PTAD derivatization was applied to analyses of food and biological samples; the major CLAs in milk and beef fat
samples were successfully identified, and trace amounts of CLAs in human saliva were detected with a simple pretreatment and
short analysis time. 相似文献
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Hiroki Hotta Qiang Wang Mioko Fukuda Shoichi Aizawa Tomonari Umemura Kazutoshi Sekizawa Kin-ichi Tsunoda 《Analytical sciences》2008,24(6):795-798
The use of electrospray ionization mass spectrometry (ESI-MS) in negative ion mode was investigated as a direct probe for identifying Al species in Al-accumulating hydrangea (Hydrangea macrophylla) samples. Cell sap solutions of hydrangea leaves were purified using Sephadex G-10 liquid chromatography and each fraction was analyzed using ESI-MS and ESI-MS/MS to identify Al species. In hydrangea leaves, a 1:1 Al-citrate complex was found as [AlH(-1)cit](-) (m/z 215), where H(3)cit denotes citric acid. This result is consistent with that of Ma et al. who used (27)Al-NMR. 相似文献
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Kobayashi Yasuhiro Kiao Shinji Seto Makoto Takatani Hiroe Nakanishi Mioko Oshima Ryuichiro 《Hyperfine Interactions》2004,159(1-4):75-80
Mössbauer measurements with circularly polarized radiation were performed on a nanocrystalline, disordered Fe48Al52 alloy. The analysis of the data for various polarization states resulted in the characterization of the hyperfine magnetic field distribution and the dependence of the average z-component of hyperfine field on the chemical environment. An increasing number of Al in the first coordination shell causes not only a decrease of magnetic moments but also introduces noncollinearity. 相似文献
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Mano J Harada M Takabatake R Furui S Kitta K Nakamura K Akiyama H Teshima R Noritake H Hatano S Futo S Minegishi Y Iizuka T 《Journal of AOAC International》2012,95(2):508-516
We have developed a real-time PCR array method to comprehensively detect genetically modified (GM) organisms. In the method, genomic DNA extracted from an agricultural product is analyzed using various qualitative real-time PCR assays on a 96-well PCR plate, targeting for individual GM events, recombinant DNA (r-DNA) segments, taxon-specific DNAs, and donor organisms of the respective r-DNAs. In this article, we report the single-laboratory validation of both DNA extraction methods and component PCR assays constituting the real-time PCR array. We selected some DNA extraction methods for specified plant matrixes, i.e., maize flour, soybean flour, and ground canola seeds, then evaluated the DNA quantity, DNA fragmentation, and PCR inhibition of the resultant DNA extracts. For the component PCR assays, we evaluated the specificity and LOD. All DNA extraction methods and component PCR assays satisfied the criteria set on the basis of previous reports. 相似文献
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