Hi,
I've read articles about preparation of film derived from food waste itself, such as potato skin, oil industry residues(seeds) and found that many researchers added NaOH into the film forming dispersion in order to increase pH.
Is it a step to dissolve cellulose or protein in the food waste by making alkaline condition?
I know this is quite a stupid question but I'm very confused if it for dissolution of cellulose or protein....plz help!
in case of shellac (hydrophobic biopolymer), adding NaOH to shellac will stabilize the system against cross linking (aging or esterification) and also to increase solubility at pH 7.
As cellulose is hydrophylic, and protein is hydrophobic, in my opinion adding NaOH is for dissolution of protein.
NaOH and alkaline condition increase solubility (OH groups --> O-Na+) in the case of polysacharides and e.g. adding of NaOH decrease gelatinization temperature of starch. The another reason is disrupt a crystailine/semicrystaline structure and form to an amorphous material. High pH for proteins causes unfolding/straightening of protein chains in aqueous solutions.
Protein is hydrophic, the simplest answer is, increasing ph maintains protein structure in an aqueous solution and in crease solubility
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