Table 1.

The comparison of iron oxide nanoparticles from various sources using various methodology reported in the literature with the present work.

Source	Type of nanoparticles	Process parameters	Enzyme immobilized	Application	References
Bauhinia tomentosa leaves	Iron oxide	0.01 M FeCl3 and Bauhinia tomentosa leaves extract in 1:1 ratio	Porcine pancreatic lipase	Synthesis of 1, 3 diolein	Present work
Polymers, inorganic materials	Silica, Zirconia, MNPs	Use of polymers, inorganic materials	Lipases, glucosidases, cellulase	Biomaterials and biocatalysts	Sigyn Bjork Sigurdardóttiretal (2018)55
Chemical synthesis using AgNO3	Magnetic gold mesoporous silica NPs	–	Cellulase	Biofuels	Elaheh Poorakbar et al. (2018)56
APTES/glutaraldehyde	MNPs	–	Beta-glucosidase	Recoverable biocatalysts	Hee Joon Park et al. (2018)57
Nyctanthes arbortristis flower extract	Iron oxide	1:1 ratio of 0.2–0.5 M FeSO4 and Nyctanthes arbortristis flower extract	–	Anti-microbial	Sharma et al.34
J. regia extract	Iron oxide	1:1 ratio of J. regia extract and FeCl2 + FeCl3 solution	–	Cytotoxicity studies using mouse embryonic cells and human adenocarcinoma cells	Izadiyan et al.12
Musa ornate sheath extract	Iron	FeSO4 solution with Musa ornate sheath extract	–	Anti-bacterial	Saranya et al. (2017)58
Langenariasicerarialeaf extract	Iron oxide	0.01 M FeCl3 and Langenariasiceraria leaf extract in 1:1 ratio	–	Anti-microbial activity	Kanagasubbulakshmi et al. (2017)59
APTES/glutaraldehyde	MNPs	–	Glucose oxidase	Study of the effect of size on activity and recovery	Hee Joon Park et al. (2011)60
Green tea leaf extract	Iron	0.1 M FeCl3 and green tea leaf extract in 2:1 ratio	–	Degradation of bromothymol blue dye	George (2009)61