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Purity Testing
We are looking to set up 2 new suppliers, Vitamin C and Aloe. I’m just wanting to double check purity, or see if there is a way to double check given these are new manufacturers. I’ve found a couple labs that will do it, but I think I’m not asking the right questions.
Does anyone have suggestions? We basically want to see that the product is what they say it is, and I have COAs for both. Just not terribly sure how to go about this.
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4 Replies
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Well, on the COAs there should be some values for tests to run. Just send out to another lab to run the tests. On the other hand, you can also get someone to run an IR or Mass Spec on the samples and see if they match up with the right raw material. Vitamin C will make sense but Aloe might be a bit harder as it is more than one material.
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I think natural/plant extract are hard to find purity. by IR can we know purity? Or only identification. what is your opinion on HPTLC analysis?
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IR spectroscopy methods can be used to determine purity if you have a standard and do a calibration curve. Depending on what you want to test and where you set your limits for ‘pure’, IR may not suffice.HPTLC is a lot nicer (not just from a visual point of view 🙂 ) when it comes to plant extracts. In case of Aloe, it may however prove difficult. The Aloe extract used for cosmetics is mostly a carbohydrate polymer… one solution can be to determine/visualise other secondary metabolites to determine quality/purity (pure with regard to pure Aloe or laced material) and another a sugar TLC of acid hydrolysed product. -
I received aloe extract having assay limit of Mucilage 40% to 50%. (supplier’s COA)
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