Integration of statistics and food process engineering: Assessing the uncertainty of thermal processing and shelf-life estimations

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Stability of the Secondary Antioxidant Bis(2,4-di-tert-butylphenyl)pentaerythritol Diphosphite in Food Simulants

To establish the stability of Ultranox 626 (an antioxidant added to plastics) in food simulants under migration conditions, migrations tests have been performed. A method has been developed for the determination of Ultranox 626 in the aqueous food simulants distilled water, 3% (w/v) acetic acid, and 15% (v/v) ethanol and in the fatty food simulants 95% (v/v) ethanol and isooctane. The method uses reversed-phase high-performance liquid chromatography with ultraviolet detection at 230 nm, is fast, and can be run automatically. To determine the stability of Ultranox 626, it was heated in each of the listed food simulants under the conditions stipulated in EU regulations for testing for compliance with migration limits. These experiments showed that this additive had acceptable stability in water, 15% and 95% (v/v) ethanol, and isooctane but that it decomposed completely in 3% (w/v) acetic acid. Migration testing with 3% acetic acid is of no use, since by the end of the testing regime the additive will have undergone substantial or total decomposition, and the level detected will not reflect the true level of migration. The EU Commission should replace 3% acetic acid with 15% ethanol as an appropriate test simulant for the determination of Ultranox 626 in all types of acid- and alcohol-containing foodstuffs. A number of experiments were carried out to develop a suitable method for the determination of Ultranox in fat simulants such as olive oil and HB 307. It appeared not possible, within the scope of this project, to obtain a method suitable to establish the stability of Ultranox 626 in fat simulants. Best results were obtained by freezing out the fat at -80 °C, but recovery was limited to 50%, which was insufficient for the intended purpose. Further experiments are required to establish the stability of Ultranox 626 in fat simulants such as olive oil and HB 307

Effect of a prior 150-MPa treatment on the chemical changes of frozen hake stored at different temperatures

58th EHPRG Meeting on High Pressure Science and Technology, 6-11 September 2020, Tenerife, Spainreezing followed by frozen storage constitutes one of the best methods to retain sensory and nutritional properties of fish products [1]. Unfortunately, during the frozen storage, fish endogenous enzymes are still active and may lead to a wide range of damage pathways, so that the shelf-life time of frozen fish can be strongly limited [2]. Among such deteriorative enzymes, lipoxygenases, peroxidases, lipases, trimethylamine oxide demethylases and proteases can be mentioned [3]. High-pressure processing (HPP) has shown to retain foodssensory and nutritional properties, while inactivating microbial populations and deteriorative endogenous enzymes [4]; consequently, its employment is found highly promising as a previous treatment to chilling [5] and frozen [6] storage of marine specieThe work was supported by the Consejo Superior de Investigaciones Científicas(CSIC) (Spain) through the Research Project 2017-70E032, by Fundação para a Ciência e a Tecnologia (FCT Portugal), European Union, QRN, FEDER, COMPETE through founding of the Organic Chemistry Research Unit (QOPNA) (project PEst-C/QUI/UI0062/2013; FCOMP-01-0124-FEDER-037296), and by Formula Grants no. 2011-31200-06041 and 2012-31200-06041 from the USDA National Institute of Food and Agriculture.CITACA (Cluster from University of Vigo) funds to present this communication is also acknowledgedPeer reviewe

Acromegalia y apnea del sueño

Objetivo: La acromegalia se relaciona frecuentemente con el síndrome de apnea-hipopnea del sueño (SAHS). El propósito de este trabajo es conocer la prevalencia del SAHS en los pacientes con acromegalia y definir las características de esta población con y sin SAHS. Pacientes y métodos: Se estudió a 17 pacientes diagnosticados de acromegalia en la provincia de Ourense (11 mujeres y 6 varones). A todos ellos se les realizó polisomnografía nocturna diagnóstica en el laboratorio del sueño, además de una determinación de hormona de crecimiento y de factor 1 de crecimiento insulina-like, y a 16 se les efectuó un estudio cefalométrico. Resultados: La edad media de los pacientes era de 58 años (intervalo de confianza [IC] del 95%, 52-63). La media del índice de masa corporal era de 31 (IC del 95%, 29-34) y la del perímetro del cuello, de 41 (IC del 95%, 39-43). Diez pacientes (58,8%) tenían un índice de apnea-hipopnea (IAH) mayor de 10; 9 presentaban apnea obstructiva y 1, central. Del total de pacientes, 7 (5 con IAH > 10 y 2 con IAH 10 y Epworth > 10) 5 pacientes (29,4%). No se encontró relación entre un IAH mayor de 10 y actividad hormonal (p = 0,082). Los sujetos con IAH mayor de 10 presentaban un valor medio de hormona de crecimiento de 4,8 (IC del 95%, 0,5-9) y en aquellos con IAH menor de 10 dicho valor era de 12 (IC del 95%, 2-27). Estaban tratados con análogos de la somatostatina el 50% de los pacientes, de los cuales la mitad presentaba apnea (p = 0,302). El estudio completo de las cefalometrías no evidenció diferencia en relación con la presencia de apneas. Conclusiones: Encontramos una alta prevalencia de apnea del sueño (58,8%) y de síndrome de apnea del sueño (29,4%), y fue una rareza la presencia de apneas centrales. No encontramos relación entre actividad hormonal y la presencia de SAHS. Los pacientes tratados con análogos de la somatostatina presentaban la misma incidencia de SAHS que los no tratados. Ningún parámetro de cefalometría resultó discriminador