HPLC for Food Analysis phần 4 ppsx

... electrochemical detection The HPLC method presented here was used for the analysis of iodide in table salt. 17 34 HPLC method performance Limit of detection for ECD 40 µg/l Repeatability of RT ... ng . 100 120 140 160 180 Table salt 2 4 6 8 10 12 14 I - Time [min] Standard mV I - Figure 24 Analysis of iodide in table salt 17. A.G. Huesgen, R. Schuster, Analysis of sele...

Ngày tải lên: 06/08/2014, 13:22

... Application Note 59 64- 3559E, 1995.  0 24 6 810 12 14 mAU 2 4 6 8 10 12 46 5 nm/30 nm 600 nm /40 nm Patent blue Chinolin yellow Time [min] Woodruff lemonade Spectra of different colors 300 40 0 500 600 ... wavelength 44 5 nm 5. A.M. Di Pietra et al., HPLC analysis of aspartame and saccharin in pharmaceutical and dietary formulations”; Chromatographia, 1990, 30, 215–219. 4. Of...

Ngày tải lên: 06/08/2014, 13:22

... prima- rily in the analysis of carbohydrates and nonaromatic acids. 1 04 <- [M + NH 4 ] + Abundance 100000 80000 60000 20000 40 000 603 639 987 40 0 600 1000 800 m/z Figure 74 Mass spectrum of ... [cis]-9) molecular weight = 8 84. 781 molecular formula = C 57 H 1 04 O 6 8 APCI requires some compound volatility and is less suitable for highly thermally labile compounds. Figure 74...

Ngày tải lên: 06/08/2014, 13:22

... 76 Gradient formation at high pressure . . . . . . . . . . . . . . . 77 Gradient formation at low pressure . . . . . . . . . . . . . . . 77 VII Part Two The Equipment Basics HPLC for Food Analysis A ... ml per injection) makes HPLC a very sensitive analysis technique. HPLC and the nondestructive detection tech- niques also enable the collection of fractions for further analys...

Ngày tải lên: 06/08/2014, 13:22

... –820 20 200000 100000 0 200 300 40 0 500 600 700 FB1 3 34. 4 352 .4 370.5 392.5 41 1.6 722.5 723.5 0 200000 100000 m/z 200 300 40 0 500 600 700 m/z 200 300 40 0 500 600 700 m/z 163.1 170.1 220.1 336.2 3 54. 4 376.6 750.5 769.5 728.5 706.5 707.5 7 04. 7 250000 150000 50000 FB3 FB2 336 .4 3 54. 5 512.0 553.5 706.5 707.3 708.7 728.5 728.5 Figure ... 17 Extract from tuna 0.2 ppm, 1 µl injec...

Ngày tải lên: 06/08/2014, 13:22

... phenethylamine 14 3-methylbutylamine 15 amylamine 16 1 ,4- diaminobutane 17 1,5-diaminopentane 18 hexylamine 19 histamine 20 heptylamine (internal standard) 20 40 60 2.0e 4 6.0e 4 8.0e 4 4.0e 4 mAU Time ... have set maximum tolerance levels for these compounds in foodstuffs. HPLC is now preferred for the analysis of amines in food matrices because of its shorter analys...

Ngày tải lên: 06/08/2014, 13:22

... prerequisite for successful food analysis. The broad selection of cleanup and enrichment techniques takes into account the many matrices and compound classes under study. Sample preparation for HPLC ... 2–3 ml/min required for standard-bore columns. In addition, narrow-bore columns are 4 6 times more sensitive using the injection volume required for a standard-bore column (see f...

Ngày tải lên: 06/08/2014, 13:22

... degassing Agilent on-line degassing Fluorescence Signal heights for selected PNAs 12 10 8 6 4 2 10 11 12 13 14 Time [min] 1 2 3 4 5 6 Figure 54 The loss of response due to quenching can be recovered ... gradient formation), and that designed for flow rates between 0.05 and 5 ml/min (high-pressure gradient formation). In separating the multiple constituents of a typical food sampl...

Ngày tải lên: 06/08/2014, 13:22

... 1.1 Ethopabat *up 13 .40 A 23.8 74 23. 840 23. 848 911 996 2.3 Benzthiazuron 12.80 A 24. 047 24. 0 24 24. 029 998 1000 0.7 Nicarbazin *up 3.00 A 32.733 32.722 32.709 336 9 84 1.2 ======== 72 .41 Part 2: Quantitation, ... Matchfactor ________________________________________________________________________________ Sulfapyridine 10.31 A 12.183 12. 143 12.159 999 1000 0.9 Furazolidone 4. 5...

Ngày tải lên: 06/08/2014, 13:22

... 60 vitamins, V, 4, 35, 42 , 44 , 66 drink, 43 fat-soluble, 42 , 46 natural, III standard, 46 synthetic, III tablets, 42 , 43 water-soluble, 42 , 43 vodka, 2 W wavelength switching, 96 wine, 2, 7, 48 wool-fiber ... hydroxyanisole, 4 BHT butylated hydroxytoluene, 4 biogenic amines, 48 biotin, 43 biphenyl, 84 bisphenol A (BADGE), 24 Numerics 1 ,4- diaminobutan, 48 1...

Ngày tải lên: 06/08/2014, 13:22