Determination of paraquat in sunflower seeds by reversed—phase high—performance liquid chromatography

Recent applications of high pressure liquid chromatography* to food analysis

“…Neff et al, 1978;Gasparoli & Fedeli, 1979), and enzymatic oxidation (e.g. Pattee & Singleton, 1979;Hatanaka et al, 1979) have been published.…”

“…Many separations of vitamin E isomers (tocopherols) have recently been published, mainly employing adsorption chromatography, applied to milk (Pickston, 1978), vegetable oils (Podlaha, Eriksson & Toeregard, 1978) and miscellaneous foods, (Tangney et al, 1979). In his paper Podlaha also presents an interesting comparison with a polarographic method.…”

“…Even in those cases where GC is not ideal, for example with carbamates, HPLC still requires a fluorometric labelling stage to increase sensitivity to provide a viable alternative (Krause, 1978;Lawrence & Leduc, 1978a). In spite of these limitations a number of methods continue to be published for specific pesticides, including diflubenzuron (Di Prima et al, 1978), carbaryl in potato and corn (Lawrence & Leduc, 1978b), paraquat in sunflower (Paschal et al, 1979), pentachlorophenol residues (Faas & Moore, 1979), ethoxyquin in apples (Ernst & Verveld-Roeer, 1979), 2-imidazoline in fruit (Newsome & Panopio, 1978), and naphthaleneacetic acid, a plant growth regulator, in fruit (Moye & Wheaton, 1978;Cochrane & Lanouetre, 1979).…”

“…It is not possible to include all the recently developed methods but the following examples will illustrate the almost universal applicability of HPLC: the sterols testosterone in meat (Stan & Hohls, 1979) and coumestrol in soyabeans (Lookhart, Jones & Finney, 1978), Amadori compounds in model Maillard browning systems (Takeoka, 1979), amines in wines (Subden ef al., 1979), fish products (Schmidtlein, 1979) and chocolate (Ingles, Tindale & Gallimore, 1978), total and available lysine (Peterson & Warthesen, 1979), methionine in fortified foods (OKeefe & Warthesen, 1978) and cysteine in fruit (Saetre & Rabenstein, 1978), isothiocyanates in rapeseed (Maheshwari et al, 1979) and in vegetables (Mullin, 1978), glycoalkaloids in potatoes (Walter, Purcell & McCollum, 1979), esters of hydroxy cinnamic and tartaric acids in grapes (Ong & Nagel, 1978), amides and phenols in coffee beans (Hunziker & Miserez, 1979;Folstar et al, 1979) and organic acids in cranberries (Coppola, Conrad & Cotler, 1978), wines (Symonds, 1978) and apple juice (Jeuring et al, 1979).…”

A simplified purification method for the analysis of abscisic acid

“…The most recent is a method published by Hubick and Reid (5) for the purification of ABA which uses silica Sep-Pak cartridges produced by Waters Associates (Milford, MA, USA) . These small (10 x 15 mm) prepacked chromatographic columns provide the type of sample cleanup and enrichment that has proved useful in a number of other sample preparation techniques [1,2,3,6,7] . In common with these reports, the silica Sep-Pak method for ABA (5) greatly reduced the number of manipulations and the time required for the earlier methods .…”