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Need some help extending the shelf life of a Natural Toothpaste
I am currently redesigning a toothpaste to extend shelf life and prevent separation. The toothpaste contains calcium carbonate, sodium bicarbonate, xylitol, minerals, flavoring oils, water and a colloidal silver suspension. The colloidal silver may be acting as a preservative/antimicrobial as testing of the product returned below 1000cfu/mL for bacteria and below 100 cfu/mL for yeast and mold.
As such I have three issues I need to address,
(1) stopping the separation of the product which occurs after a period of months. I have looked into binding/thickening agents and have arrived at the following: guar gum, xantham gum, gum arabica. Would these be suitable choices as a means to stop separation?
(2) Determining whether or not my toothpaste is sufficiently preserved?
(I understand that a preservative challenge test is likely the best option but want to avoid spending the money if possible.)(3) Determining a way to better preserve my toothpaste in a ‘natural’ manner if possible or at least a less contentious semi-natural way if required. I am looking into self-preservation quite extensively as an option whether that be reducing water activity, changing pH etc but I am not quite sure how to go about this especially considering the function and nature of toothpaste?
If anyone could offer advice on the above three questions that would be fantastic.
Thanks
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