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The reaction of the starch changing colour is the result of the formation of polyiodide chains from the reaction of starch and iodine. The amylose, or straight chain portion of starch, forms helices where iodine molecules assemble, forming a dark purple/black color.
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∙ 13y ago
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If iodine were not available how would you determine whether starch hydrolysis occurred?
A dye would be needed if iodine were not available. The ingredients can also be scientifically measured to tell whether or not hydrolysis had occurred.
How long did the starch react with achromatic point?
Achromatic means "without color." During a hydrolysis test, starch auger is used to grow bacteria. An iodine reagent is used to flood the plate. The starch is dyed a blue-brown color. Areas where the starch has been completely digested by the bacteria, are clear. That is known as the achromatic point, or the point at which all the starch has been consumed and the iodine does not dye the auger.
What is a Contrast medium made of?
It is usually a barium or iodine dye
What is a Contrast agent made of?
It is usually a barium or iodine dye
How long do you have to dry tie dye when removed from the dye bath?
just set it out until you detect it is dry!
What is used to dye animal cells?
Methylene Blue is the name of the dye Iodine is used for dyeing plant cells hope this helps :-)
What type of test can detect a silent leak in a toilet?
Dye testing
Does imitation crab meat have blood in it?
Yes, red dye.
What does the presence of blue color means in variegated leaf experiment of photosynthesis?
By blue color I assume you mean an added dye that shows how some parts of the leaf can photosynthesize and others not. The easiest of these experiments is to place the leaf in boiling ethanol (alcohol) and when drained of colour spread out on a flat surface. Soak the leaf in iodine and the green parts will turn blue/black and the non green parts will stay the yellowish brown colour of iodine. The green parts contain starch (a more compact form of glucose) which makes iodine turn blue/black. The blue/black is what will show starch is present.
How is iodine used as a mordant?
As per the exact chemistry, I am unsure, but basically the iodine acts to "set in" the stain by reacting the dye (crystal violet) from the previous step with the peptidoglycan layer, forming a layer which is now insoluble in the following step where the layer is washed with EtOH. If the cell is Gram (-), the iodine doesn't do much and the dye is washed away.
What is chemical indicator dye?
An indicator is use to detect the given object is acid or a base
Metal that is used as a dye cat scans?
The metal that is used as a dye in CT scans is water soluble iodine or barium. These are sometimes avoided by patients because of allergies to the metals.
