Alhendín, Spain
Alhendín, Spain

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Abad P.,Dmc Research Center Slu | Arroyo-Manzanares N.,University of Granada | Gil L.,Dmc Research Center Slu | Garcia-Campana A.M.,University of Granada
Journal of Agricultural and Food Chemistry | Year: 2017

Onion extract is used as a feed supplement for the diet of dairy cows, acting as inhibitor of methane production; however, its properties could alter sensory attributes of milk. In this work, we propose a method to evaluate the influence of this extract on milk properties, using propyl propane thiosulfonate (PTSO) as a marker. PTSO is extracted using a quick, easy, cheap, effective, rugged, and safe procedure and monitored by high-performance liquid chromatography with ultraviolet detection. The method was applied to milk samples obtained from 100 dairy cows fed during 2 months with enriched feed. In addition, a milk tasting panel was established to evaluate the PTSO residue that should not be exceeded to guarantee milk sensory attributes. It was established that a value of PTSO lower than 2 mg kg-1 does not alter milk organoleptic properties. This fact makes onion extract an interesting alternative as a feed supplement to control the methane emissions without any influence on milk attributes. © 2016 American Chemical Society.

Abad P.,Dmc Research Center Slu | Arroyo-Manzanares N.,University of Granada | Garcia-Campana A.M.,University of Granada
Analytical Methods | Year: 2016

Allium derivative propyl propane thiosulfonate (PTSO) is a new additive for animal feed which improves animal health when used as an alternative to antibiotic growth promoters. Despite the effort of the European Union to ensure the control of animal feed alterations, information available on this new additive is sparse and analytical methods used for its monitoring have limited reach. Moreover, existing analytical methods exhibit shortcomings when applied to other matrices or when attempting to measure low concentration levels. This paper describes for the first time that PTSO reacts instantaneously with cysteine (CYS) and glutathione (GLU) generating s-propyl mercaptocysteine (CSSP) and s-propyl mercaptoglutathione (GSSP), thus explaining the limitations of previous methods when applied to feed with high concentration levels of CYS and GLU. Therefore, an ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) method combined with a sample treatment based on simple solid-liquid extraction with methanol is proposed for the monitoring of PTSO, CSSP and GSSP in a wide range of animal feed samples including those for pigs, piglets, broilers, hens, rabbits and partridges. This method provides a simple, robust and efficient alternative for the determination of this additive. Matrix-matched calibration curves were established for PTSO, CSSP and GSSP and limits of detection (LODs) and quantification (LOQs) were estimated, being lower than the ones previously reported for PTSO when using HPLC-UV. The relative standard deviation of the whole analytical method was lower than 10% in all cases, while recoveries ranged from 93% to 104%. © The Royal Society of Chemistry.

Abad P.,Dmc Research Center Slu | Lara F.J.,University of Granada | Arroyo-Manzanares N.,University of Granada | Banos A.,Dmc Research Center Slu | And 2 more authors.
Food Analytical Methods | Year: 2014

A new simple analytical method for monitoring propyl propane thiosulfonate (PTSO) in animal feed is presented. PTSO is an active ingredient from Allium spp. (like onion and shallot), proposed as a natural additive for feed being an efficient alternative to antibiotics used as growth promoter due to its efficiency improving animal health. Reversed-phase liquid chromatography with UV detection has been used and a previous sample treatment based on solid-liquid extraction has been developed and optimized in order to extract PTSO from a feed for laying hens using acetone as extraction solvent. The method has been characterized obtaining limits of detection and quantification of 11.2 and 37.3 mg kg-1, respectively, which are lower than the concentrations expected in samples containing this additive. The intra- and interday relative standard deviations (RSDs) were lower than 8.3 % in all the cases, and recoveries varied from 90.2 to 94.6 %. Finally, in order to check the unequivocal identification of PTSO, mass spectrometry detection was applied. The proposed method is a simple procedure for monitoring PTSO in commercial feed, being possible to implement it in routine laboratories for quantification purposes and stability studies of the distributed products. © 2014 Springer Science+Business Media New York.

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