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Our results

Contents
  1. Introduction
  2. Human milk digestion in the preterm infant: impact of technological treatments
  3. Research & Innovation 2017 - For Food and Biobased Products
  4. The way in which proteins aggregate when heated may change their sensitising potency
  5. Enhancing the viability of spray-dried probiotic bacteria by stimulating their stress tolerance
  6. To stick or not to stick? Pulling pili sheds new light on biofilm formation
  7. When biopolymers selfassemble: a balance between energy and entropy.
  8. Mimicking the gastrointestinal digestion in a lab-on-a-chip:the microdigester
  9. How a milk droplet becomes a powder grain
  10. Research & Innovation 2016 - For Food and Bioproducts
  11. A new process for the biorefining of plants
  12. Under the UV light : the bacterial membrane
  13. Reverse engineering or how to rebuild ... bread!
  14. Green Chemistry: a step towards lipid production in yeast
  15. Individually designed neo-enzymes for antibacterial vaccines
  16. Multi-scale mechanical modelling: from the nanometric scale to the macroscopic properties of bread crumb
  17. Minimill: 500 g to assess the milling value of soft wheats
  18. Microbial production of lipids for energy or chemical purposes
  19. The discrete role of ferulic acid in the assembly of lignified cell wall
  20. Eco-design of composites made from wood co-products
  21. Analysis of volatile compounds enables the authentication of a poultry production system
  22. Nanoparticles as capping agents for biopolymers microscopy
  23. Pasteurisation, UHT, microfiltration...All the processes don't affect the nutritional quality of milk in the same way
  24. Integration of expert knowledge applied to cheese ripening
  25. Controlling cheese mass loss during ripening
  26. The shape memory of starch
  27. Research & Innovation 2015 - For Food & Biobased Products
  28. Behaviour of casein micelles during milk filtering operations
  29. Overaccumulation of lipids by the yeast S. cerevisiae for the production of biokerosine
  30. Sequential ventilation in cheese ripening rooms: 50% electrical energy savings
  31. An innovative process to extract bioactive compounds from wheat
  32. Diffusion weighted MRI: a generic tool for the microimaging of lipids in food matrices
  33. Characterization of a major gene of anthocyanin biosynthesis in grape berry
  34. New enzyme activity detectors made from semi-reflective biopolymer nanolayers
  35. Improving our knowledge about the structure of the casein micelle
  36. Heating milk seems to favour the development of allergy in infants
  37. Fun with Shape
  38. Using volatile metabolites in meat products to detect livestock contamination by environmental micropollutants
  39. SensinMouth, when taste makes sense
  40. A decision support system for the fresh fruit and vegetable chain based on a knowledge engineering approach
  41. SOLEIL casts light on the 3D structure of proteins responsible for the stabilisation of storage lipids in oilseed plants
  42. A close-up view of the multi-scale protein assembly process
  43. Controlling the drying of infant dairy products by taking water-constituent interactions into account
  44. Polysccharide nanocrystals to stabilise pickering emulsions
  45. Discovery of new degradative enzymes of plant polysaccharides in the human intestinal microbiome
  46. A durum wheat flour adapted for the production of traditional baguettes
  47. Virtual modelling to guide the construction of « tailored-made » enzymes
  48. How far can we reduce the salt content of cooked meat products?
  49. Diffusion of organic substances in polymer materials: beyond existing scaling laws
  50. Smart Foams : various ways to destroy foams on demand !
  51. Dates, rich in tannins and yet neither bitter nor astringent
  52. Sodium content reduction in food
  53. Research & Innovation 2014

Human milk digestion in the preterm infant: impact of technological treatments

When mother’s milk is not available, human milk from a milk bank can be administered after pasteurisation (62.5°C, 30 min) to very low birth weight infants. This treatment, which ensures sanitary quality, denatures bioactive proteins such as endogenous lipases, which, in their native states, contribute to lipid digestion in infants. Infants fed pasteurised milk showed reduced fat absorption and growth compared to those fed raw milk. In contrast, homogenisation could improve lipolysis by increasing the speci c surface of the fat droplets. Our objective was to evaluate the impact of technological treatments on the digestive behaviour of human milk.

Updated on 08/11/2017
Published on 08/11/2017
Keywords:

Our objective was to evaluate the impact of technological treatments on the digestive behaviour of human milk in structural and biochemical terms, using either in vitro (dynamic digestion system of INRA, DIDGI®) or in vivo (20 preterm infants, ethically approved clinical trial, NCT02112331) approaches. While the in vitro approach allowed access to gastric and intestinal phases, only the gastric digestion step could be monitored in the preterm infants through their feeding tube.

Our work shows that technological treatments impact the microstructure of human milk, and this is maintained during digestion. Pasteurisation does not impact gastric lipolysis but tends to reduce it in the intestinal phase. On the contrary, homogenisation doubles the degree of lipolysis of the pasteurised milk. Regarding proteins, only pasteurisation enhances gastric proteolysis of lactoferrin. The gastric emptying rate is similar between raw and pasteurised milks but reduced for homogenised milk (half-emptying time: 30 vs. 38 min, respectively). Postprandial gastric pH evolves similarly for all milks, with a mean pH of 4.6 at 90 min of digestion. Enzymatic activity of lipases in gastric e uents tends to be higher after ingestion of raw milk compared to pasteurised and homogenised milks. The present data are crucial for a better understanding of the digestive conditions in infants, making it possible to improve the corresponding in vitro models. Our results provide essential knowledge for supporting the challenging decisions in clinical practices and nutritional interventions for preterm infants. Homogenisation could be a strategy for improving growth in preterm infants, but it needs to be evaluated in a larger clinical trial.

1. digesteur dynamique DIDGI ® ; 2, 3, 4 : images obtenues en microscopie confocale de lait maternel cru (2), pasteurisé (3), pasteurisé et homogénéisé (4) colorés par des sondes fluorescentes spécifiques. En vert apparaissent les lipides apolaires, en rouge les molécules amphiphiles, en bleu les protéines.. © INRA, Bourlieu-Lacanal et al.
1. digesteur dynamique DIDGI ® ; 2, 3, 4 : images obtenues en microscopie confocale de lait maternel cru (2), pasteurisé (3), pasteurisé et homogénéisé (4) colorés par des sondes fluorescentes spécifiques. En vert apparaissent les lipides apolaires, en rouge les molécules amphiphiles, en bleu les protéines. © INRA, Bourlieu-Lacanal et al.
Dynamic digestor DIDGI ® ; 2, 3, 4 : microscopy confocal of lait maternel  (2), pasteurised (3), pasteurised and homogenised (4) stained with specific fluorescents . in green: apolar lipids, in red: amphiphilic compounds and in blue: proteins

Partners :

CHU Rennes, Hôpital Sud, Pôle Femme Enfant

UMR Enzymologie Interfaciale & Physiologie de la Lipolyse, Marseille

Institut de Physique de Rennes

Grants :

Grant from CoRECT, CHU Rennes

PhD grant from CNpQ Brazil

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Publications

Bourlieu, C., G. Paboeuf, S. Chever, S. Pezennec, J. F. Cavalier, F. Guyomarc'h, A. Deglaire, S. Bouhallab, D. Dupont, F. Carriere and V. Vie (2016). Adsorption of gastric lipase onto multicomponent model lipid monolayers with phase separation. Colloids and Surfaces B : Biointerfaces 143: 97-106.

De Oliveira, S. (2016) Impact de la pasteurisation et de l’homogénéisation sur la digestion du lait maternel chez le nouveau-né: Etudes in vitro et in vivo. Thèse en sciences de l’aliment, Rennes : Agrocampus Ouest. 228 pp.

De Oliveira, S., Deglaire, A., Ménard, O., Bellanger, A., Rousseau, F., Henry, G., Dirson, E., Carrière, F., Dupont, D., Bourlieu-Lacanal, C. (2016). Holder pasteurization impacts the proteolysis, lipolysis and disintegration of human milk under in vitro dynamic term newborn digestion. Food Research International. DOI : 10.1016/j.foodres.2015.11.022