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Antioxidant supplementation is ineffective to reduce the frequency of PSE-like zones in pork hams

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Antoine Vautier et al., 64th International Congress of Meat Science and Technology (ICOMST), 12-17 août 2018, Melbourne, Australie

The frequency of pork hams with PSE-like zones is a major issue for the processed meat sector in France, despite recent improvements in the slaughter techniques and systematic sorting on the ultimate pH value of hams. Halothane genotype, still widespread in its heterozygous form, may play a significant role in this issue [1]. On the other hand, a recent work described at a molecular level a possible link between oxidative stress and the specific development of PSE-like zone [2]. From this hypothesis, an experimental design was carried out at the IFIP Experimental Station to evaluate the effect of antioxidant supplementation in pig diet on the appearance of PSE-like zone and more generally on the overall ham quality before and after cooking process. 

PDF icon Antoine Vautier et al., 64th ICOMST, 12-17 août 2018, Melbourne, Australie
2018
Evolution du muscle post mortem et qualité d’une viande (mise à jour 2018 du Mémento viandes et charcuteries)

Evolution du muscle post mortem et qualité d’une viande (mise à jour 2018 du Mémento viandes et charcuteries)

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Après la mort de l’animal, les mécanismes de conservation de l’homéostasie continuent de fonctionner alors que le métabolisme musculaire est profondément remanié en raison de l’arrêt de la circulation sanguine. Ces modifications initient le processus de conversion du muscle en viande où le tissu musculaire sera le siège de nombreuses évolutions biologiques déterminantes pour l’obtention d’une viande de qualité, tant pour sa consommation en frais que pour sa transformation. Cette synthèse du Mémento Viandes et Charcuteries décrit comment la composition biochimique de la viande, ses attributs sensoriels et technologiques sont influencés par son évolution post mortem.

Synthèse illustrée de 11 pages tirée du Mémento viandes et charcuteries, disponible immédiatement en téléchargement.

35,00 €
2018

Observatoire des pH ultimes et du défaut «viande déstructurée» des jambons de porc abattus en France / Observatory on ultimate pH and the PSE-like ham defect in pigs slaughtered in France

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Les Cahiers de l'IFIP, 7(1), 25-33 - La revue R&D de la filière porcine française

L’IFIP - Institut du porc a réalisé près de 25 000 mesures de pH et 10 000 notations du défaut déstructuré dans 5 entreprises du secteur abattage découpe au cours des saisons été et hiver de 2019. Ces cinq entreprises représentent environ 30% des porcs abattus en 2019 (zone Uniporc). Le niveau de pH moyen obtenu est de 5,69, avec un écart de type 0,16. La proportion de viandes normales (pH entre 5,6 et 6,0) est de 63 %, 32 % des viandes avaient des pH inférieurs à 5,6, et 5 % des pH supérieurs à 6,0. Nos données montrent une grande variabilité entre abattoirs ou entre jours de mesure pour un abattoir, ce qui suppose des marges de progression pour la filière. Nos résultats mettent en évidence une différence significative des résultats de pH entre les deux saisons étudiées et moyennés sur les 5 entreprises. Nous avons confirmé une meilleure qualité des viandes en saison hiver. La proportion moyenne dans l’étude de viandes touchées par le défaut déstructuré est de 19,3 %. Parmi les lots de jambons évalués, les lots triés pour une borne de tri de pH de 5,5 ou 5,6 présentaient des taux de viandes déstructurées de l’ordre de 15 à 17 %. Ce tri est donc peu efficace au regard des taux de viandes déstructurées de la population globale. En revanche, malgré le petit nombre de lots évalués, nous constatons qu’il y a un vrai apport de la sélection avec une borne de pH de 5,7 (7 à 9 % de viandes déstructurées), et que la sélection à une borne de pH de 5,8 n’apporte pas plus pour la sélection des jambons non déstructurés.

IFIP–Pig and Pork Science performed almost 25,000 pH measurements and collated almost 10,000 PSE-like scores at 5 pig slaughterhouses over the course of winter and summer 2019. These 5 slaughterhouses together represent around 30% of pigs slaughtered in France in 2019 (Uniporc coverage zone). Mean ham pH level was 5.69 with 0.16 standard deviation. The proportion of normal-pH meat (i.e. in the range pH 5.6–pH 6.0), was 63%, while 32% were pH < 5.6 and 5% were pH > 6.0. Our data shows huge variation between slaughterhouses and day-to-day variation in a given slaughterhouse, which points to significant scope for improvement across this commodity chain. Our results find a significant between-season difference in pH-measurement results averaged across the 5 slaughtering companies studied. This study confirms that winter-season meat is better quality. Mean proportion of the PSE-like destructured meat defect found in hams sampled for this study was 19.3%. Among the full sample of batches of ham assessed, batches sorted at a pH cut-off of pH 5.5 or 5.6 had a 15%–17% case-rate of PSE-like defect, which we find to be ineffective given the destructuration case-rate in the global population here. However, despite a relatively small number of batches assessed, we find that selective grading at a pH cut-off of pH 5.7 brings a real performance benefit (7%–9% PSE-like case-rate) that is not further improved by selective grading at a pH cut-off of 5.8.

35,00 €
2021

Toward the prediction of PSE-like muscle defect in hams: Using chemometrics for the spectral fingerprinting of plasm

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Laetitia Théron (Inrae), Food Control, 2020, volume 109, mars

PSE-like muscle defect is of great importance in the cooked ham industry because of the economic losses it can cause. Although this muscle defect has been widely studied from a mechanistic angle, there is a lack of reliable and practical markers. This study proposes the use of chemometrics for the spectral fingerprinting of pig plasma to predict the PSE-like muscle defect in cooked hams. Both MALDI-TOF mass spectrometry and ATR-FTIR spectroscopy were used to obtain protein and chemical function fingerprints. Though the two approaches showed very good predictive capacity, MALDI-TOF mass spectrometry was found to be better suited to predicting normal hams, i.e. hams without the defect; while ATR-FTIR spectroscopy was found to be better suited to predicting the PSE-like muscle defect. These results demonstrated the feasibility of predicting the PSE-like defect using spectral fingerprinting and chemometrics approaches.

2020

Toward the prediction of the PSE-Like muscle mefect in cooked hams

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Laetitia Théron (Inrae), Meat and Muscle Biology, 2020, volume 4, n°2, juillet, 6 pages

Pale Soft Exudative (PSE)-like muscle defect is of great importance in the cooked ham industry because of the economic losses it can cause. The flagship product is the “Jambon supérieur,” a polyphosphate-free cooked ham, usually sold sliced and packaged. Slicing is an automatic process that reveals the defect as holes in the slice leading to slicing losses. Up to now, the PSE-like defect has only been detected on raw meat after deboning the pork leg because it affects the inner part of the semimembranosus muscles and also the adductor muscles. The objective of this study was to develop innovative approaches that combine mechanistic elucidation and the discovery of potential biomarkers (i) at the level of the muscle and (ii) at the level of the live animal by analyzing proteins from plasma. The use of chemometrics for the spectral fingerprinting of pig plasma was chosen to predict the PSE-like muscle defect in raw hams.

source : https://www.iastatedigitalpress.com/mmb/article/11156/galley/10837/download/

2020

Visible and near infrared spectroscopy for PSE-like zones classification at different post mortem times

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The ability of visible and near infrared spectroscopy (VIS-NIRS) to predict PSE-like zone classification was examined on 150 deboned hams at 5 post mortem times (12, 16, 20, 24 and 36 h pm). Four probes were used to investigate the accuracy. Two of our probes were prototypes. Partial Least Squares Discriminant Analysis (PLSDA) was used to determine the prediction models from spectrums recorded on semimembranosus muscle. Surface probes gave better results than inserted probes. The best probe showed moreover a good accuracy whatever the pm times was when measuring (78 to 86 % good prediction in external validation as the 24 h pm model was used). Its false negative/false positive ratios were favorable at the early pm times (12 to 20 h pm). So an early PSE-like zones prediction is possible using VIS-NIRS.

The prototype probe inserted showed good results (82,9% good prediction in external validation) and would deserve additional validation on bone-in hams, as industrials need.

PDF icon lhommeau_2015icomst.pdf
2015

Visible and near infrared spectroscopy for PSE-like zones classification at different post mortem times

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Poster.

The defect of PSE-like zones is a major cause of slicing losses in the French “jambon supérieur” cooked ham process. VIS-NIR spectroscopy is now known as a reference method for meat composition assessments and for predicting the meat quality parameters such as ultimate pH, color, texture, or drip loss. The aim of this study was to investigate the NIRS ability to predict PSE-like class of deboned hams at different post mortem times. The use of new probes was planned in order to improve the prediction models.

PDF icon lhommeau2015icomst-poster.pdf
2015