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排序方式: 共有80条查询结果,搜索用时 15 毫秒
61.
Md Khairul Islam Tomislav Sostaric Lee Yong Lim Katherine Hammer Cornelia Locher 《Molecules (Basel, Switzerland)》2022,27(23)
Honeys are commonly subjected to a series of post-harvest processing steps, such as filtration and/or radiation treatment and heating to various temperatures, which might affect their physicochemical properties and bioactivity levels. Therefore, there is a need for robust quality control assessments after honey processing and storage to ensure that the exposure to higher temperatures, for example, does not compromise the honey’s chemical composition and/or antioxidant activity. This paper describes a comprehensive short-term (48 h) and long-term (5 months) study of the effects of temperature (40 °C, 60 °C and 80 °C) on three commercial honeys (Manuka, Marri and Coastal Peppermint) and an artificial honey, using high-performance thin-layer chromatography (HPTLC) analysis. Samples were collected at baseline, at 6 h, 12 h, 24 h and 48 h, and then monthly for five months. Then, they were analysed for potential changes in their organic extract HPTLC fingerprints, in their HPTLC-DPPH total band activities, in their major sugar composition and in their hydroxymethylfurfural (HMF) content. It was found that, while all the assessed parameters changed over the monitoring period, changes were moderate at 40 °C but increased significantly with increasing temperature, especially the honeys’ HPTLC-DPPH total band activity and HMF content. 相似文献
62.
V. Meyer und L. Locher 《Fresenius' Journal of Analytical Chemistry》1875,14(1):371-373
Ohne Zusammenfassung 相似文献
63.
L. Locher 《Commentarii Mathematici Helvetici》1934,6(1):76-82
Ohne Zusammenfassung 相似文献
64.
Islam Md Khairul Keay Jemma Hussenbocus Yasmin Svagelj Aaron Lam David Sostaric Tomislav Nguyen Minh Lim Lee Yong Skett Spencer Locher Cornelia 《平面色谱法杂志一现代薄层色谱法》2021,34(3):189-195
JPC – Journal of Planar Chromatography – Modern TLC - A simple and rapid high-performance thin-layer chromatography (HPTLC) assay was developed and validated for the quantification of... 相似文献
65.
An effective diquark model is constructed for protonium annihilation into two meons. Branching ratios are calculated and compared with experimental data. The agreement is within two standard deviations. 相似文献
66.
联苯胺分光光度法测定食盐中碘含量 总被引:2,自引:0,他引:2
基于在盐酸介质中,碘酸钾氧化联苯胺使其显色,提出了光度法测定食盐中微量碘的方法。在40℃的水浴中,当2 mol.L-1盐酸溶液用量为1.00 mL0、.42 g.L-1联苯胺溶液用量为0.80 mL时,方法的线性范围为100~1 400μg.L-1,最大吸收波长在425 nm处,表观摩尔吸光率为1.4×105L.mol-1.cm-1。用于测定加碘食盐中碘含量的测定,回收率在97.5%~101.2%之间,相对标准偏差(n=7)在0.9%~1.9%之间。 相似文献
67.
Blom JF Brütsch T Barbaras D Bethuel Y Locher HH Hubschwerlen C Gademann K 《Organic letters》2006,8(4):737-740
[structure: see text] Nostocarboline and seven derivatives were prepared and displayed minimal inhibitory concentration (MIC) values >or=100 nM against the growth of Microcystis aeruginosa PCC 7806, Synechococcus PCC 6911, and Kirchneriella contorta SAG 11.81, probably via the inhibition of photosynthesis. The natural product hybrid nostocarboline/ciprofloxacin displayed additional antibacterial activity against several Gram-negative bacteria (MICs >or=0.7 microM). Nostocarboline can thus be considered a potent, selective, readily available, natural algicide. 相似文献
68.
Relativistic study of the reaction pp → dπ: Formalism and comparison with experiment at Tp = 578 MeV
A detailed relativistic calculation of pp → πd is presented. The leading graph is the exchange of a nucleon and a pion. The πN amplitudes, including off-shell information, are input, together with relativistic dpn and πNN vertex functions. The dominant nucleon spectator term is calculated without uncontrolled approximations, and the relativistic pion antiparticle contribution is evaluated. The single nucleon exchange diagram is added. Higher order rescattering is treated by initial and final state distortion factors. All amplitudes and spin observables are calculated and a detailed comparison with the measured data at 578 MeV is made. The remaining observed discrepancies are traced to the pp spin-triplet waves. 相似文献
69.
70.
In a recent paper (JAT 53, 1988, pp. 17–25) Berger and Tasche present a constructive approach to Hermite-Lagrange two-point interpolation using Taylor's formula in the theory of right-invertible operators. In this paper we alternatively propose the argumentation via Peano kernels to obtain explicit representation formulas for this special kind of interpolation. 相似文献