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• 2018-12-02 23:51發(fā)布了問答

  高分懸賞，會人工英語翻譯的進~~~

  AnalyticalMethodsofVolatileAnalysisManyanalyticalmethodshavebeenusedforthesamplingandisolationofvolatilecompoundsgeneratedduringlipidoxidation.Sampling，usingmethodssuchas... Analytical Methods of Volatile Analysis Many analytical methods have been used for the sampling and isolation of volatile compounds generated during lipid oxidation. Sampling， using methods such as extraction， headspace analysis， and solid-phase microextraction (SPME)， offers a means to collect and often pre-concentrate volatiles from samples. Isolation allows the separation of the extracted volatiles and is often accomplished using gas chromatography (GC) or high-pressure liquid chroma- tography (HPLC). Aromatic compounds are produced in low con- centrations at the onset of lipid oxidation， thereby requiring a method that not only isolates the compounds， but concentrates them. In addition， food provides a complex matrix from which to extract the compounds. Several studies have addressed the bind- ing of lipid oxidation products to proteins (O’Keefe and others 1991; Gutheil and others 1992). These bound compounds need to be liberated before the oxidation products can be accurately quantified. Sample preparation can complicate the assessment of lipid oxidative status as a number of these lipid oxidation prod- ucts are thermally generated. Care must be taken to extract the compounds present in the sample while not generating additional oxidation products or allowing the volatile compounds to de- grade during the extraction process. The most common procedures reported in the literature for the determination of lipid oxidation products from muscle foods are GC methods. In this review， sampling methodologies of distillation and solvent extraction， and isolation methods associated with GC and HPLC analyses will be discussed. Within those gas chromato- graphic methodologies， static HS， dynamic purge-and-trap HS， and solid-phase microextraction (SPME) will be addressed. A summary of the different isolation methods is presented in Table 1. 只要翻譯的通順即可。雖然長了點，可是80分還是值得的吧 展開

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• 2018-12-01 18:10發(fā)布了問答

  液相色譜儀檢測辣度不出峰

  液相色譜儀檢測辣度不出峰

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• 2018-11-21 02:48發(fā)布了問答

  離子色譜法測定食品中亞硫酸鹽比分光光度法有何優(yōu)點

  　

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• 2017-10-13 23:11發(fā)布了問答

  氣相色譜中，色譜柱內(nèi)徑的選擇根據(jù)什么？

  　

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• 2017-04-18 07:56發(fā)布了問答

  色譜分析中常用的定量分析方法有哪幾種

  　

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• 2016-01-07 19:39發(fā)布了問答

  氣相色譜儀老化一般要多久才能完成

  　

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• 2015-06-02 08:55發(fā)布了問答

  氣相色譜儀燒柱子汽化，檢測要調(diào)多少度?型號是9790

  　

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• 2012-06-25 17:44發(fā)布了問答

  氣相與液相色譜的基本設(shè)備有哪些

  　

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• 2011-11-21 00:14發(fā)布了問答

  氣相色譜FID檢測器是怎樣收集信號的?

  　

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• 2011-05-30 01:45發(fā)布了問答

  氣相色譜檢測器有哪些？

  　

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• 2010-12-24 19:10發(fā)布了問答

  中鈔特種防偽科技有限公司待遇怎么樣呀，碩士進去年薪多少？自動化碩士

  　

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• 2010-10-06 14:22發(fā)布了問答

  GX液相色譜法與氣相色譜法的有哪些異同點

  GX液相色譜法與氣相色譜法的有哪些異同點... GX液相色譜法與氣相色譜法的有哪些異同點 展開

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