Soy seed or soybean (Glycine max L.) is the most promising source of edible oil (18%-22%) and high quality of protein (on average 40% proteins with a high ratio of essential amino acids) (Pavlićević et al., 2013). After the separation of oil from soy seeds, soymeal or soybean meal is the solid residue generated as a by-product of soybean processing. More than 67 million metric tons (MMT) of soymeal was produced in China in 2018-2019 followed by the United States (44.279 MMT), Brazil (33.35 MMT), Argentina (31.2 MMT), and India (7.68 MMT) (USDA, 2019).Soymeal has found its application in various industries such as textile sizing, paper coating, production of biodegradable plastics, and as animal feed (Oduntan & Arueya, 2019;Zhao et al., ,2015Zhao et al., , , 2016. Owing to high protein content, soymeal is utilized for the extraction of proteins by various conventional techniques such as aqueous, alkaline, and salt (especially calcium chloride)-based extractions (Kasai & Ikehara, 2005;Maltais et al., 2005). However, these conventional techniques have some serious shortcomings. A large amount of acerbic or alkaline wastewater is formed, which can cause severe environmental pollution along with the possibility of protein denaturation at high pH.Moreover, the extraction of proteins from soy meal in high yields is difficult; hence various enzymatic, ultrasound-assisted, chemical, or solvent methods are also applied in order to increase the protein ex-