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MICRO 4131 April 4 Prelab quiz
Terms in this set (23)
linear polysaccharide normally isolated from many strains of marine brown seaweed and algae
what two uronic acids make up sodium alginate?
D mannuronic acid (M) and L guluronic acid (G)
what properties does sodium alginate have since it is the skeletal component of algae?
strong yet flexible
is the alginate polymer anomic or catonic?
are responsible for the cross linking of both different polymer molecules and different parts of the same polymer chain
the exchange of calcium ions for sodium ions- carried out under mild conditions
what controls the pore size in gelation?
the starting material
2 Na(alginate) + Ca++ -->
Ca(alginate)2 + 2Na+
will heating liquify the gel?
no because it is thermostable
what is recommended by alignate vendors?
to include 3mM calcium ions in the substrate medium
what can be used to easily re dissolve the gel while avoid gel destabilization?
immersing in solution containing high concentration of sodium, potassium, or magnesium
how is alginate used in industrial setting?
in food, pharmaceuticals, textile, paper products
what are the properties of alginate utilized in the industrial setting?
thickening, stabilizing, gel forming, film forming
____ guluronic acid content results in stronger gel
since the mild conditions are needed for gelation, calcium alginate is also widely used for ____ ____
is typically done by incoculating the milk with different bacterial strains
what are some of the strains used for yogurt fermentation?
streptococcus thermophilus, lactobacillus casei, lactobacillus acidophilus
commercial yogurt products may also contain several different compounds like ____ or its alternatives to increase the firmness of the final product
what must be true of milk in order for it to be called yogurt?
must contain several thousands of viable bacterial cells
what are factors that yogurt fermentation depends on?
temperature, moisture, initial bacterial inoculum, and time
in todays lab what strain is going to be used to inoculate milk to prepare yogurt?
is alginic acid soluble or insoluble?
can be either depending on type of associated salt
why are you supposed to leave the sodium alginate solution undisturbed for 30 minutes after dissolved?
to eliminate air bubbles that can later be trapped and cause the beads to float
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