Hello,
I tried to heat a water solution of rice starch, but it turned into somethig like gelatin. What is the best way to sterilize this material without changing its viscosity?
Do you want to sterilize the starch in solution? or can you sterilize the starch powder?
With the presence of heat and water at 121 deg. celcius starch is potential to gelatinize, which means the starch granules break out and the composition of amylose and amylopectin disperse. Thus, the gelatin-like solution is obtained. In another word, starch gum. In lab, starch tends to gelatinise at the temperature of 90 deg. celcius. I would suggest that you autoclave rice starch (in solid form) and distilled water separately. Together to be autoclave is the beakers etc. in case you want to prepare it in sterile condition. Then please proceed the heating in laminar flow. Good luck!
I think there is little chance of obtaining the starch in its normally state after sterilization. So, if you are sure that the starch powder is sterile especially during its drying, you better use sterile water or autoclave both separately as suggested.
You can try any of the nonthermal technologies like cold plasma, pulsed light, UV or gamma irradiation. Any of these can make your starch sterile with minimum or non damage to physicochemical properties of the starch at various treatment condition. I will advise you to use the dry form of your rice starch. You may search for relevant literature for guide on the treatment condition. Article Functional and rheological properties of cold plasma treated...
onlinelibrary.wiley.com/doi/10.1002/star.201700009/full
Article Effect of gamma irradiation on the physicochemical propertie...
ifrj.upm.edu.my/.../41%20IFRJ%2020%20(03)%202013%20Thawean%20(052).pdf
Article Structural properties and digestibility of pulsed electric f...
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