I have made methanolic extract of a specific flower to use as antioxidant in frying, but the moment I added it to the hot oil, it burned, while many papers have used the extract in temperature of 180 C for many hours, why this happened for me? I know it might be because of sugar content, but I am sure the extract which they have used in other papers have sugar too, but non of them had reported this. I appreciate if you share your experience.
hi pery perv....the boiling point of methanol is 64.7C..if u added hotter oil , the vapor of methanol may get flam
try to evaporate methanol using a rotavap, then dissolve the residue directly in oil. If your extract contains a lot of sugars it will burn. In this case, use a fewer amount until you get a good result.
i prefer use ethanol to extraction, not methanol to use antioxidant in food product (oil)
ethanol 70%, then condensed by rotary evaporator
ethanol is edible solvent
Thank you very much for your guidance. I have already evaporated the methanol, but no matter how much I add the dried extract it still changes to black, yes it has 50 percent of sugar but I have seen many papers adding the fruit extract to the frying oil under the same procedure, so I am wondering why they have successfully managed the test and only this burns
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