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Illustration of a biology experiment showing starch and maltose tests using test tubes in a warm water bath, pipettes, and well plates.

Illustration of a biology experiment showing starch and maltose tests using test tubes in a warm water bath, pipettes, and well plates.
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schématise ce protocole pour une illustration de tableau niveau 1ère spécialité SVT : Les tubes à essai A, B, C et D doivent rester dans le bain-marie réglé à 37°C durant toute la durée de l’expérience. Partie 1 : Mise en évidence de l’amidon 1) Déposer une goutte d’eau iodée dans 12 puits de la plaque de coloration. 2) Préparer les tubes A et B en suivant les indications ci-dessous : Tubes à préparer : ATTENTION : Bien lire le protocole jusqu’à l’étape 4) avant de préparer les tubes ! 3) Prélever immédiatement une goutte dans le tube A avec une pipette en plastique propre et la déposer dans un puit contenant une goutte d’eau iodée. Procéder de la même manière pour le tube B. Penser à organiser votre plaque de coloration en notant le nom du tube ainsi que le temps au bout duquel le contenu a été prélevé. 4) Réaliser un prélèvement dans chaque tube à essai toutes les 3 minutes pendant 15 minutes en prenant soin de noter les résultats obtenus au fur-et-à mesure. Partie 2 : Mise en évidence du maltose 1) Préparer les tubes C et D en suivant les indications ci-dessous : Tubes à préparer : ATTENTION : Bien lire le protocole jusqu’à l’étape 3) avant de préparer les tubes ! 2) Le plus rapidement possible après avoir préparé les tubes C et D, prendre un tube à essai propre et y verser quelques gouttes de liqueur de Fehling puis y ajouter l’équivalent d’une pipette du contenu prélevé dans le tube C. Réaliser la même manipulation dans un autre tube à essai propre pour le tube D. See more

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