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phosphoric acid/kool
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8 resultaten
[Validation study on a multi-residue analysis of pesticides in agricultural products by using phosphoric acid treatment and GC-MS/MS].
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A rapid method for multi-residue determination of pesticides in agricultural products was validated. The sample was cut into pieces and placed into a mixer cup containing half weight amount of 10% phosphoric acid in order to suppress degradation of easily degraded pesticides, represented by captan,
Kinetic-spectrophotometric determination of trace amounts of vanadium(V) based on its catalytic effect on the reaction of DBM-arsenazo and potassium bromate.
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A simple and sensitive kinetic-spectrophotometric method is developed for the determination of trace vanadium(V), based on the catalytic effect of vanadium(V) on the oxidation of DBM-arsenazo by potassium bromate in 0.0138 moll(-1) phosphoric acid medium and at 100 degrees C in the presence of
Some properties of purified phospholipase D and especially the effect of amphipathic substances.
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1. The soluble phospholipase D of cabbage was purified by heat treatment, acetone precipitation and electrophoresis on a density gradient of aqueous glycerol. 2. The purified enzyme slowly attacked a lecithin suspension whereas ultrasonically treated lecithin was hydrolysed more rapidly. 3. Diethyl
[Study of complex lipids. Synthesis of diphosphatidylglycerol (cardiolipin) with unsaturated fatty acid residues].
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Diphosphatidylglycerol (cardiolipin) with different fatty acid residues has been synthesised by condensation of 1,2-diacyl-sn-glycero-3-phosphoric acid (obtained, e.g., by the cabbage phospholipase D cleavage of 1,2-dioleyl-sn-glycero-3-phosphocholine or egg phosphatidylcholine) with
[Chemical mechanisms involved in slow fire processing and pulverization of Brassica juncea].
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This article dealed with the effects of processing method and duration on the major bioactive components (sinigrin and sinapine thiocyanate) in Brassica juncea. The contents of sinigrin and sinapine thiocyanate in decoctions of raw and processed B. juncea were determined and compared by high
[Determination of Iodine and Iodate in Brine and Seafood Simultaneously by Ultraviolet Absorption Spectrometry].
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The iodide in samples was oxidized to iodate by bromine water, which could be removed by formic acid, and iodate could be transformed to I3- with excess of I- in phosphoric acid, the iodate in samples could be transformed directly to I3- with excess of I- in phosphoric acid. The I3- solution had
[Selection of winter plant species for wetlands constructed as sewage treatment systems and evaluation of their wastewater purification potentials].
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In order to establish an evaluation system for selection of winter wetland plants possessing high wastewater purification potentials in subtropics areas, designed sewage treatment experiments were carried out by introducing into the constructed wetlands 25 species of winter wetland plants. Cluster
Liquid chromatographic-electrochemical determination of ethylenethiourea in foods by revised official method.
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AOAC official method 29.119-29.125 was revised to determine ethylenethiourea (ETU) directly by a liquid chromatographic-electrochemical (LC-EC) determinative technique and to improve ETU recovery. ETU is extracted from food products with a methanol-aqueous sodium acetate solution. A portion of the
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