環(huán)保在線
詳細(xì)介紹
為了提高選擇性，XSelectCSH 氟苯基柱提供了的方法開發(fā)自由度，特別是在流動相低pH值下，不封端的吸附劑能加強(qiáng)酸性化合物的保留性。CSH氟苯基色譜柱對位置異構(gòu)體、鹵代化合物和極性化合物具有優(yōu)異選擇性。部分原因在于多種保留機(jī)理的綜合效果，包括偶極-偶極作用、氫鍵作用、芳香性(π-π)作用和疏水作用。但由于帶電表面顆粒[CSH]的化學(xué)特性，與傳統(tǒng)PFP鍵合固定相相比，CSH氟苯基色譜柱可增強(qiáng)對酸性化合物的保留。
Simultaneous determination of twelve sweeteners and nine preservatives in foods by solid-phase extraction and LC-MS/MS
A rapid and simple method for the simultaneous determination of twelve sweeteners and nine preservatives in various foods by liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed. The sweeteners and preservatives were extracted from solid samples with 80% and 50% methanol and from liquid samples with 80% methanol, followed by Oasis WAX cartridge cleanup. The LC separation was performed on a XSelect CSH Phenyl-Hexyl column (5 μm, 2.1 mm ×150 mm) with a phase of 10 mmol/L acetate buffer (pH 4.0)-acetonitrile and MS detection with negative ion electrospray ionization. The quantification limits of acesulfame K (AK), alitame (AL), aspartame (ASP), cyclamic acid (CYC), neotame (NEO), saccharin Na (SAC), p-hydroxybenzoic acid methyl (PHBA-Me), p-hydroxybenzoic acid ethyl (PHBA-Et), p-hydroxybenzoic acid isopropyl (PHBA-iPr), p-hydroxybenzoic acid propyl (PHBA-Pr), p-hydroxybenzoic acid isobutyl (PHBA-iBu) and p-hydroxybenzoic acid butyl (PHBA-Bu) were 0.001 g/kg, those of dulcin (DU), glycyrrhizic acid (GLY), neohesperidin dihydrochalcone (NHDC), rebaudioside A (REB), stevioside (STV), sucralose (SUC) and benzoic acid (BA) were 0.005 g/kg, and those of sorbic acid (SOA) and dehydroacetic acid (DHA) were 0.02 g/kg. The mean recoveries from ten kinds of foods fortified at the levels of 0.02 and 0.2 g/kg were 70.9-119.0%, and their relative standard deviations were 0.1-11.7%.
品名 | 編號 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 3 mm X 75 mm, 1/pkg | 186005649 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 2.1 mm X 30 mm, 1/pkg | 186005328 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 75 mm, 1/pkg | 186005646 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 150 mm, 1/pkg | 186005325 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 75 mm, 1/pkg | 186005323 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 1 mm X 50 mm, 1/pkg | 186005304 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 100 mm, 1/pkg | 186005324 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 1 mm X 100 mm, 1/pkg | 186005305 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 30 mm, 1/pkg | 186005321 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 50 mm, 1/pkg | 186005322 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 20 mm, 1/pkg | 186005308 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 4.6 mm X 20 mm, 1/pkg | 186005320 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 30 mm, 1/pkg | 186005309 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 150 mm, 1/pkg | 186005312 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 100 mm, 1/pkg | 186005311 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 2.1 mm X 50 mm, 1/pkg | 186005310 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 3 mm X 50 mm, 1/pkg | 186005316 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 3 mm X 100 mm, 1/pkg | 186005317 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 3 mm X 20 mm, 1/pkg | 186005314 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 2.1 mm X 100 mm, 1/pkg | 186005330 |
XSelect CSH Fluoro Phenyl Column, 130?, 3.5 µm, 3 mm X 150 mm, 1/pkg | 186005318 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 2.1 mm X 150 mm, 1/pkg | 186005331 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 3 mm X 150 mm, 1/pkg | 186005337 |
XSelect CSH Fluoro Phenyl Method Validation Kit, 130?, 2.5 µm, 2.1 mm X 150 mm, 3/pkg | 186006788 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 3 mm X 100 mm, 1/pkg | 186005336 |
XSelect CSH Fluoro Phenyl Column, 130?, 5 µm, 3 mm X 50 mm, 1/pkg | 186005335 |
XSelect CSH Fluoro Phenyl Method Validation Kit, 130?, 5 µm, 2.1 mm X 150 mm, 3/pkg | 186005554 |
XSelect CSH Fluoro Phenyl Method Validation Kit, 130?, 3.5 µm, 4.6 mm X 150 mm, 3/pkg | 186005553 |
XSelect CSH Fluoro Phenyl Method Validation Kit, 130?, 3.5 µm, 4.6 mm X 100 mm, 3/pkg | 186005552 |
環(huán)保在線