Conventional and non-conventional phytochemical extraction of Bambara groundnut: A review
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Abstract
Bambara groundnut (BGN) is a grain legume known for its nutritional value. However, its nutritional and nutraceutical potential associated with its phytochemical content is not fully tapped. This is probably due to the paucity of information on the various non-conventional extraction techniques used to extract the phytochemicals present in the different parts of the BGN. This review collated information on the conventional and non-conventional techniques applied in the extraction of phytochemicals from BGN. Among the techniques are ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE), supercritical carbon dioxide extraction (SC-CO2), enzyme-assisted extraction (EAE), pulse electric field (PEF), subcritical water extraction (SWE), molecularly imprinted polymers (MIPs) and magnetic molecularly imprinted polymers (MMIP). Interestingly, researchers have regularly applied only UAE to extract phytochemicals from BGN. This could be the reason for the limited identification of some important low-molecular-weight phytochemicals that are in low concentration in BGN. A greater application of these techniques individually or in combination is necessary to promote the extraction of phytochemicals and reveal the potential of BGN.
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