I want to separate starch and cellulose from each other in grounded potato peel waste. I need both parts, but separately.
Do you have any idea how I can do it?
Hi
Scoop the grated potatoes into a pot, then cover them with warm water. How much water you end up using will vary, but about 3 to 4 cups (700 to 950 milliliters) should be enough. If you used a food processor, you may notice some white stuff in the bowl. This is some of your starch.
you can go through this link for more information
Good luck
https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.901.3525&rep=rep1&type=pdf
Thank you, Jalal
the potato peels were dried and grinded, I cooked them but the flesh didn't separate from cellulose skin. I completely mix them by blender, for 10 minutes, but both cellulose and starch pulverized. now, I cannot separate starch from potato, both of which are incorporated together.
Cellulose fibres are likely to be larger than potato starch granules. The latter have maximum size 100 micrometer. First, try to estimate the size of cellulose fibres by microscopy. Separation can be attempted by making a dilute suspension, sieve it over e.g. 200 micrometer and wash the sieve residue with water. Effect of separation can be tested by micoscopy and/or iodine test. If separation is insufficient you can try a homogenization treatment prior to sieving. Starch granules will survive such treatment.
In addition to Dr. Steeneken's reply, you could use a dialysis membrane to separate starch and cellulose given the large difference between the degree of polymerization (DP) for these polymers (DP starch ≈ 35 ; DP cellulose >> 300). You may need to disperse your blend of cellulose-starch in a mild alkaline solution before dialysis. I recommend using an aqueous solution of about 5% NaOH.
Furthermore, the solvent N-methyl Morpholine N-Oxide (NMMO) could be used to selectively dissolve starch on cellulose fibres. It has been observed that starch fully dissolves in solutions of 70% w/w NMMO; whereas, cellulose dissolves in solutions of 86% w/w NMMO and above. Therefore, there is a good range of concentrations of NMMO to separate starch and cellulose. Be aware of the effect of temperature for the dissolution of starch and cellulose
Finally, you could always use deep eutectic solvents and ionic liquids to separate starch and cellulose. (Please see the article below).
I hope it helps.
References:
Article Solvent Effects on Starch Dissolution and Gelatinization
https://www.mdpi.com/2073-4360/14/2/220/pdf
https://www.sciencedirect.com/science/article/abs/pii/S0144861715008541#:~:text=Some%20traditionally%2D%20and%20broadly%2Dused,e.g.%2C%20KOH%20and%20NaOH).
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