vitamine C

Orange

les  jus d'orange...

Attention aux appelations : ne pas confondre : "pur jus de fruits" ou 100% pur jus ....et  "jus à base de concentré" 

  • Les « pur jus de fruits » ou « 100 % pur jus »  sont obtenus par simple pression des fruits, sans aucune adjonction de sucre ni colorant ni conservateur.
  • Les  jus à base de concentré  sont élaborés à partir de jus congelés dont le producteur (Espagnol par exemple) a éliminé la majeure partie de l’eau afin de réduire les frais de transport. Une fois arrivé dans le pays de destination, le jus est reconstitué en rajoutant de l’eau en quantité équivalente à celle extraite. 

 

L’ajout de sucre est-il autorisé dans les jus de fruits ?

  •  Contrairement aux idées reçues la réponse est NON pour les 100% pur jus  !
  • Pour les jus à base de concentré cela est possible (lire les étiquettes )

 

Orange contre citron : le gagnant est ?

réponse ici :

http://www.diet-sport-coach.com/pages/content/info-sante-dieteitqu/citron-contre-orange-vrai-ou-faux.html

 

Votre jus de citron ou d'orange frais a-t-il encore de la vitamine C ?

Ici ou là traîne l'idée reçue selon laquelle cette pauvre vitamine C partirait en fumée en 5 minutes après la mise en jus d'une orange ou d'un citron !!!!
Ce qui incite du coup certains à se dire que c'est mieux de s'enfiler des cachet de vitamine de synthèse

Certes la vitamine C est la plus fragile des vitamines avec la vitamine B1.
Certes on l'utilise comme indicateur de maintien de la qualité vitaminique des aliments , car si la vit C est préservée de fait les autres vitamines le seront aussi !
Certes La vitamine C est extrêmement sensible à l'oxygène de l'air à la lumière (d’où l'intérêt des bouteilles opaques pour conserver les jus de fruits).
Néanmoins il faut resté nuancé 
Plusieurs études ( cf ci-dessous ) arrivent au même constat : 
la perte la plus rapide s'observe sur un jus d'orange frais : on est à 2% par jour ....
La pomme de terre quant à elle , conservée à température ambiante perd 15% de sa teneur en vitamine C par mois

 

extrait du site de "Que Choisir"  :

Vitaminec

 

Destruction à la chaleur 

  •  À partir d’une température de 70 degrés, la vitamine C  est détruite. Plus exactement il s'agit d'une enzyme qui se retrouve détruite : il s'agit de l'oxydase de l'acide ascorbique.
  • Le simple fait de blanchir une minute  un légume entraîne déjà une perte de 35% de la vitamine C !
  • Pour conserver au maximum la vitamine C, l'idéal est la cuisson à la vapeur douce en les laissant "al dente" (croquants)

 

source :

  • Southgate D. & Johnson I. (1993),

"Food processing", édition :  "Human nutrition and dietetics 9th Edition" 

  • Gregory III J. (1996)

"Vitamins", édiiton  "Food Chemistry 3rd"

 

un site de référence sur la vitamine C :

http://www.vitaminec-news.be/fr/

 

autres sources bibliographiques 

>> Yeom HW, Streaker CB, Zhang QH, Min DB. (2000) 
"Effects of pulsed electric fields on the quality of orange juice and comparison with heat pasteurization."
édition : Joural Agric Food Chem.
Cette étude montre notamment que 20% des vitamines C disparaissent après pasteurisation

>> Gil-Izquierdo A, Gil MI, Ferreres F. (2002) 
"Effect of processing techniques at industrial scale on orange juice antioxidant and beneficial health compounds."
édition Journal Agricol Food Chem

>> Johnston CS, Bowling DL. (2002) 
"Stability of ascorbic acid in commercially available oranges juices."
édition : Journal Amical Diet Assoc.

>> Alwazeer D, Delbeau C, Divies C, Cachon R. (2003) 
Use o redox potential modification by gas improves microbial quality, color retention, and ascorbic acid stability of pasteurized orange juice."
édition : International Journal Food Microbiol

Ce post ne traite que de la fragilité de la Vitamine C en lien à l'oxydation de l'air , bien évidemment cette Vitamine présente d'autres fragilités : la chaleur en particulier ( destruction quasi totale après une cuisson prolongée)

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