High Pressure Liquid Chromatographic Determination of Methomyl and Oxamyl on Vegetable Crops

1978 ◽  
Vol 61 (1) ◽  
pp. 15-17
Author(s):  
James E Thean ◽  
W George Fong ◽  
David R Lorenz ◽  
Thomas L Stephens
Keyword(s):  
High Pressure ◽  
Chromatographic Determination ◽  
Vegetable Crops ◽  
High Pressure Liquid Chromatographic ◽  
Vegetable Extract ◽  
Liquid Chromatographic Method ◽  
Cleanup Procedure ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A reverse phase high pressure liquid chromatographic method is presented for the separation and determination of residues of the carbamates oxamyl and methomyl on vegetables. A liquid-liquid extraction and cleanup procedure is applied to the vegetable extract. Samples are eluted from μBondapak C18 column and quantitated by ultraviolet absorbance at 240 nm. Recovery data for vegetable samples spiked at 2 ppm are presented.

Ion Pairing High Pressure Liquid Chromatographic Determination of Amaranth in Licorice Products

1981 ◽  
Vol 64 (6) ◽  
pp. 1411-1413
Author(s):  
William J Hurst ◽  
James M Mckim ◽  
Robert A Martin
Keyword(s):  
High Pressure ◽  
Ion Pairing ◽  
Chromatographic Determination ◽  
Buffer Solution ◽  
High Pressure Liquid Chromatographic ◽  
Coefficients Of Variation ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A high pressure liquid chromatographic method is described for the determination of amaranth (FD&C Red No. 2; Red No. 2) in licorice products. The Red No. 2 is extracted with a basic buffer solution, cleaned up on a Sep-Pak column, chromatographed on a reverse phase column in the ion pairing mode, and detected at 254 nm. The procedure is time-conservative with accurate and precise results. Recovery data ranged from 93 to 104%, and coefficients of variation were less than 4% for standards and samples.

High Pressure Liquid Chromatographic Determination of Oxazepam Dosage Forms: Collaborative Study

1983 ◽  
Vol 66 (4) ◽  
pp. 864-866
Author(s):  
Eileen S Bargo ◽  
◽  
E Aranda ◽  
C Bonnin ◽  
S Hauser ◽  
...  
Keyword(s):  
High Pressure ◽  
Collaborative Study ◽  
Chromatographic Determination ◽  
Reverse Phase ◽  
High Pressure Liquid Chromatographic ◽  
Coefficients Of Variation ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A reverse phase high pressure liquid chromatographic method for the determination of oxazepam in tablets and capsules was collaboratively studied by 9 laboratories. Collaborators were supplied with 6 samples that included synthetic and commercial formulations. Tablet and capsule composites are diluted with methanol and filtered. Oxazepam is determined at 254 nm by using a C18 column. Mean recoveries of oxazepam from synthetic tablet and capsule formulations were 97.2 and 99.0%, respectively. Mean coefficients of variation for tablets and capsules ranged from 1.85 to 2.86%. The method has been adopted official first action.

High-Pressure Liquid Chromatographic Determination of Uncombined Intermediates and Subsidiary Colors in FD&C Blue No. 2

1975 ◽  
Vol 58 (1) ◽  
pp. 48-49 ◽  
Author(s):  
Manjeet Singh
Keyword(s):  
High Pressure ◽  
Sulfonic Acid ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A high-pressure liquid chromatographic method is presented for the isolation and determination of uncombined intermediates and subsidiary colors in FD&C Blue No. 2 (indigotine, C.I. No. 73015). Samples of FD&C Blue No. 2 containing 0.1–0.3% isatin, 0.1–0.3% isatin 5-sulfonic acid, 0.1–5.0% monosulfonated indigo, and 1.0–18.0% 5,7’-disulfonated indigo were prepared and analyzed by using this method. Recoveries ranged between 92 and 102%.

High Pressure Liquid Chromatographic Determination of Major Organic Acids in Cranberry Juice

1978 ◽  
Vol 61 (6) ◽  
pp. 1490-1492 ◽  
Author(s):  
Elia D Coppola ◽  
Edward C Conrad ◽  
Richard Cotter
Keyword(s):  
High Pressure ◽  
Organic Acids ◽  
Chromatographic Determination ◽  
Cranberry Juice ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
The Mean ◽  
Liquid Chromatographic

Abstract A reverse phase high pressure liquid chromatographic method is presented for the simultaneous separation and determination of quinic, malic, and citric acids in single strength, undiluted cranberry juice. After a 1:10 dilution and cleanup through a disposable column, major organic acids in cranberry juice are separated on a Bondapak/C18 column and quantitated by using a differential refractometer. Twenty-seven samples of different single strength cranberry juice were analyzed using this method; the mean content of quinic, malic, and citric acids were 1.32 (std dev. 0.150), 0.92 (std dev. 0.079), and 1.08% (std dev. 0.111), respectively. Mean percent recoveries of each acid were quinic 95.4 (std dev. 6.8), malic 96.6 (std dev. 5.8), and citric 94.0% (std dev. 4.8).

High Pressure Liquid Chromatographic Determination of Allantoin in Cosmetic Creams and Lotions

1982 ◽  
Vol 65 (6) ◽  
pp. 1362-1365
Author(s):  
Kazuo Nakao ◽  
Keiichi Honda ◽  
Tohru Yoneya
Keyword(s):  
High Pressure ◽  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Reverse Phase ◽  
High Pressure Liquid Chromatographic ◽  
Silica Column ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A sensitive high pressure liquid chromatographic method was developed for the determination of allantoin in cosmetic preparations. The procedure consists of simple cleanup of samples, derivatization with p-nitrobenzaldehyde in N,N-dimethylformamide to an ultraviolet labeled derivative, and reverse phase chromatography on an octadecylsilylated silica column. Ultraviolet absorbance was measured at 270 nm. Recovery was greater than 97% for cosmetic samples, and the minimum limit of detection was 10 ng.

High Pressure Liquid Chromatographic Determination of Sodium Fluoroacetate (Compound 1080) in Canine Gastric Content

1981 ◽  
Vol 64 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Allen G Ray ◽  
Lynn O Post ◽  
John C Reagor
Keyword(s):  
High Pressure ◽  
Gastric Content ◽  
Chromatographic Determination ◽  
Acetate Solution ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Bonded Phase ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A sensitive high pressure liquid chromatographic method was developed for the determination of sodium fluoroacetate (compound 1080) in canine gastric content. The procedure involves extraction of 1080 with water, methyl ethyl ketone, and dilute base, followed by sample cleanup using octadecylsilane bonded phase cartridges and derivatization in ethyl acetate solution with O-p-nitrobenzyl-N-N’-diisopropylisourea (PNBDI). The compound was chromatographed on a 10 μm silica column, and ultraviolet absorbance at 254 and 280 nm was measured. Recovery was greater than 95% for standard 1080 and in the 70-90% range for spiked samples (1-50 ppm).

High Pressure Liquid Chromatographic Determination of β-Sitosterol and β-Sitosterol-D-Glucoside in Whisky

1981 ◽  
Vol 64 (1) ◽  
pp. 181-185
Author(s):  
Kevin J Byrne ◽  
George H Reazin ◽  
Arthur A Andreasen
Keyword(s):  
High Pressure ◽  
Extraction Procedure ◽  
Detection Limits ◽  
Chromatographic Determination ◽  
High Pressure Liquid Chromatographic ◽  
Ultraviolet Wavelength ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A high pressure liquid chromatographic method is presented for determining the oak wood steroids, β-sitosterol and β-sitosterol-D-glucoside, which contribute to floe formation in whisky. The steroids are extracted from whisky by using an adsorbent resin, Amberlite XAD-2, and are detected at 210 nm, orarederivatized to 2,5-dinitrobenzoate esters which are detectable over a wide ultraviolet wavelength range. Detection limits were less than 0.1 ppm for β-sitosterol and less than 0.2 ppm for β-sitosterol-D-glucoside in most whiskies, using the extraction procedure described. When the steroids were derivatized, the detection limits were decreased by about a factor of 10.

High Pressure Liquid Chromatographic Determination of Capsaicin in Oleoresin and Personal Protection Aerosols

1983 ◽  
Vol 66 (5) ◽  
pp. 1304-1306
Author(s):  
Mark W Law
Keyword(s):  
High Pressure ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Personal Protection ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Hot Peppers ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A simple and accurate high pressure liquid chromatographic method has been developed for determination of capsaicin in oleoresin capsicum and mineral oil-based aerosol formulations intended for personal protection. Capsaicin, the main ingredient responsible for the spicy pungency of various hot peppers and paprika, is extracted with acetonitrile and aliquots are analyzed on a 10 μm C18 column at 280 nm with acetonitrile-water (45 + 55) mobile phase. Dihydrocapsaicin is also extracted and is simultaneously quantitated with propiophenone as an internal standard.

High Pressure Liquid Chromatographic Determination of Furazolidone in Turkey Tissue

1979 ◽  
Vol 62 (2) ◽  
pp. 257-261
Author(s):  
Betty-Ann Hoener ◽  
Gloria Lee ◽  
William Lundergan
Keyword(s):  
High Pressure ◽  
Coefficient Of Variation ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Reverse Phase ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A high pressure liquid chromatographic method for determining furazolidone in turkey tissue has been developed. Tissues are ground with methanol and centrifuged. For lower levels of furazolidone, 2—40 ppb, the supernate is evaporated to dryness and redissolved before it is injected onto the liquid chromatographic column. Using a reverse phase column and an ultraviolet absorption detector set at 365 nm, the assay is linear over the concentration range 2—400 ppb with a coefficient of variation of <4%. Average recovery from fortified tissues was 96% with a coefficient of variation of 6% at the 50-400 ppb level, and 105% with a coefficient of variation of 11% at the 2—40 ppb level.

High-Pressure Liquid Chromatographic Determination of Uncombined Intermediates in FD&C Red No. 40

1974 ◽  
Vol 57 (1) ◽  
pp. 219-220
Author(s):  
Manjeet Singh
Keyword(s):  
High Pressure ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
High Pressure Liquid Chromatographic ◽  
Allura Red ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Good Agreement

Abstract A high-pressure liquid chromatographic method was developed for the isolation and determination of uncombined intermediates in FD&C Red No. 40 (Allura Red AC, food color). Samples of FD&C Red No. 40 containing 0.1–0.4% cresidine sulfonic acid, 0.1–0.4% Schaeffer's salt, and 0.3–1.0% 6,6'-oxybis(2-naphthalenesulfonic acid) were prepared and analyzed using this method. Recoveries ranged between 92 and 101%. When 32 samples of FD&C Red No. 40 were analyzed by the conventional column chromatographic method as well as by the high-pressure liquid chromatographic method, good agreement was obtained between the 2 methods.

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