Separation, identification and determination of lumichrome in swine feed and kidney

1991 ◽  
Vol 8 (6) ◽  
pp. 737-748
Author(s):  
D. G. Kindack ◽  
A. Macintosh ◽  
M. Lebelle ◽  
G. Carignan ◽  
S. Sved
Keyword(s):  
Swine Feed

Microbiological Determination of Neomycin in Feeds: Collaborative Study

1989 ◽  
Vol 72 (2) ◽  
pp. 237-241
Author(s):  
Gerald L Stahl ◽  
D Dal Kratzer ◽  
Charles W Kasson
Keyword(s):  
Statistical Analysis ◽  
Confidence Interval ◽  
Salt Concentration ◽  
Agar Medium ◽  
Collaborative Study ◽  
Tris Buffer ◽  
Official Method ◽  
The Mean ◽  
Swine Feed

Abstract A modification of the AOAC microbiological determination of neomycin in feeds was collaboratively studied by 12 laboratories. The official method was modified by substituting a constant salt concentration diluent for the feed extract diluent, preparing the agar medium in tris buffer, and performing the test with a monolayer plating system. Each laboratory performed single assays on 8 samples in a randomized sequence. The samples included duplicates of a cattle and swine feed at 2 different marketed concentrations. The mean recovery across all laboratories was 110.7% of theory with a range of means of 69.4-128.6 across the 12 laboratories. The results of one laboratory and 2 additional values from different laboratories were deemed outliers and excluded from statistical analysis. The statistical analysis gave a confidence interval of ± 26% for individual assays.

Liquid Chromatographic Determination of Carbadox Residues in Animal Feed

1985 ◽  
Vol 68 (4) ◽  
pp. 653-657
Author(s):  
Jose E Roybal ◽  
Robert K Munns ◽  
Wilbert Shimoda
Keyword(s):  
Animal Feed ◽  
Chromatographic Determination ◽  
Alumina Column ◽  
Acid Base ◽  
Reverse Phase ◽  
Liquid Chromatographic Determination ◽  
Swine Feed ◽  
Liquid Chromatographic ◽  
Base Liquid

Abstract A liquid chromatographic (LC) method for determining residues of carbadox in the 0.01-10 ppm range in swine feed is described. Carbadox is extracted from ground feed with 25% acidified methanol- CHCl3, removed from emulsion-forming coextractables via an alumina column, separated from highly colored pigments by acid-base liquid- , liquid partitioning, and finally isolated from interferences on a second | alumina column. Isocratic reverse phase LC at 305 nm is used for quantitation. The average overall recovery at the 0.1,0.5, and 1.0 ppm J spike levels was 83.0% with a standard deviation of 2.04% and a coefficient of variation of 2.46 %.

Determination of fluoroquinolone antibiotics via ionic-liquid-based, salt-induced, dual microextraction in swine feed

2016 ◽  
Vol 408 (22) ◽  
pp. 6105-6114 ◽  
Author(s):  
Huili Wang ◽  
Ming Gao ◽  
Jiajia Gao ◽  
Nana Yu ◽  
Hong Huang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fluoroquinolone Antibiotics ◽  
Swine Feed

scholarly journals Survey of quality of swine feed mixes

2002 ◽  
Vol 56 (1-2) ◽  
pp. 41-52 ◽  
Author(s):  
Zoran Masic ◽  
Dobrila Jakic-Dimic ◽  
Vidica Stanacev ◽  
Zlatan Sinovec
Keyword(s):  
Microbiological Analysis ◽  
Fusarium Spp ◽  
Copper Manganese ◽  
Bacillus Spp ◽  
Swine Feed ◽  
The Republic ◽  
Staphylococcus Spp ◽  
Penicillium Spp

The paper presents the results of analyses of the chemical composition of 455 samples, microbiological analysis of 412 samples, and mucotoxicological analyses of 212 samples of feed mixes for different categories of swine which arrived for control at authorized laboratories from the territory of the Republic of Serbia during the period from 2000 until 2001. The analyses of 455 swine feed mix samples showed that as many as 185 feed mixes do not meet the quality condition on protein content envisaged by legal regulations, and the highest discrepancy was determined in feed mixes for piglets. Analyses of Ca, P and NaCl contents showed that the mixes in a large number of cases contain insufficient quantities, and in a considerable number even quantities which are not permitted. Analyses of the contents of certain microelements showed that mixes contain insufficient quantities in a large number of cases, especially of copper, manganese and zinc. The number of saprophytic bacteria greatly varied depending on the type of feed mix but all examined samples contained a permitted number of saprophytic bacteria. These analyses most often isolated Bacillus spp., Staphylococcus spp., coliform bacteries, and Micrococcus spp.. Most examined samples contained a permitted number of clostridia, and a smaller number of samples mostly for piglets, showed an impermissible number of clostridia. The quantity of mold fungi in mixes was significantly higher in mixes for young animals, and the determination of fungi most frequently resulted in the isolation of Penicillium spp., Aspergillus spp., Fusarium spp., and Mucor spp.. The mucotoxin analysis of 212 feed mixes showed that only 30.2% were within permitted levels, and the differences between the mixes for young and adult animals were not significant. The mucotoxins most often present were zearalenon and ochratoxin, and all mixes in which aflatoxin and trychotecenes were identified contained these toxins in quantities above permitted levels.

scholarly journals Simultaneous Determination of Ergot Alkaloids in Swine and Dairy Feeds Using Ultra High-Performance Liquid Chromatography-Tandem Mass Spectrometry

Toxins ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 724
Author(s):  
Saranya Poapolathep ◽  
Narumol Klangkaew ◽  
Zhaowei Zhang ◽  
Mario Giorgi ◽  
Antonio Francesco Logrieco ◽  
...  
Keyword(s):  
High Performance ◽  
Ergot Alkaloids ◽  
The European Union ◽  
Chromatography Tandem Mass Spectrometry ◽  
Occurrence Data ◽  
Performance Recovery ◽  
Liquid Chromatography Tandem Mass ◽  
Swine Feed ◽  
Feed Samples

Ergot alkaloids (EAs) are mycotoxins mainly produced by the fungus Claviceps purpurea. EAs are known to affect the nervous system and to be vasoconstrictors in humans and animals. This work presents recent advances in swine and dairy feeds regarding 11 major EAs, namely ergometrine, ergosine, ergotamine, ergocornine, ergocryptine, ergocristine, ergosinine, ergotaminine, ergocorninine, ergocryptinine, and ergocristinine. A reliable, sensitive, and accurate multiple mycotoxin method, based on extraction with a Mycosep 150 multifunctional column prior to analysis using UHPLC-MS/MS, was validated using samples of swine feed (100) and dairy feed (100) for the 11 targeted EAs. Based on the obtained validation results, this method showed good performance recovery and inter-day and intra-day precision that are in accordance with standard criteria to ensure reliable occurrence data on EA contaminants. More than 49% of the swine feed samples were contaminated with EAs, especially ergocryptine(-ine) (40%) and ergosine (-ine) and ergotamine (-ine) (37%). However, many of the 11 EAs were not detectable in any swine feed samples. In addition, there were contaminated (positive) dairy feed samples, especially for ergocryptine (-ine) (50%), ergosine (-ine) (48%), ergotamine (-ine), and ergocristine (-ine) (49%). The mycotoxin levels in the feed samples in this study almost complied with the European Union regulations.

Application of dual-template molecularly imprinted polymer-based solid phase extraction for determination of phenothiazines and benzodiazepines in swine feed

2018 ◽  
Vol 10 (25) ◽  
pp. 3001-3010 ◽  
Author(s):  
Wan Qiu Xia ◽  
Peng Lei Cui ◽  
Geng Nan Wang ◽  
Jing Liu ◽  
Jian Ping Wang
Keyword(s):  
Solid Phase Extraction ◽  
Molecularly Imprinted Polymer ◽  
Solid Phase ◽  
Phase Extraction ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Swine Feed

Process of dual-template molecularly imprinted polymer-based solid phase extraction for phenothiazines and benzodiazepines.

Liquid Chromatographic Determination of Oxfendazole in Swine Feeds

1984 ◽  
Vol 67 (4) ◽  
pp. 707-709 ◽  
Author(s):  
Gaman Shah ◽  
Dorothy Bradley ◽  
Efraim Shek
Keyword(s):  
Mobile Phase ◽  
Glacial Acetic Acid ◽  
Complete Recovery ◽  
Chromatographic Determination ◽  
Solvent Mixture ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Swine Feed ◽  
Liquid Chromatographic

Abstract A relatively simple analytical method is presented for determination of oxfendazole (2-(methoxycarbonylamino)-5-phenylsulfinyl-benzimidazole) at levels as low as 0.012% in swine feeds, using cation exchange liquid chromatography (LC). The sample was extracted with a solvent mixture of methanol-glacial acetic acid (90 + 10) at 45°C, using a gyrorotory shaker. Plant pigments and other feed excipients were removed using zinc acetate treatment and pH-controlled extraction. Oxfendazole was further separated from the remaining interferences and quantitatively determined by LC on a Partisil SCX column with acetonitrile-1.01M phosphate buffer as mobile phase. The method is stability-specific, linear, precise, and accurate at 80-120% labeled strength (relative standard deviation 0.9-1.7 with mean recovery of 98-99%). Supporting data at a level of 0.0135% oxfendazole in swine feed indicated that this method is capable of complete recovery of oxfendazole from medicated swine feeds.

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