Phytochemical Analysis and Characterization of Corn Silk (<i>Zea mays</i>, G5417)
2022
Jyoti Singh | Baskaran Stephen Inbaraj | Sawinder Kaur | Prasad Rasane | Vikas Nanda
Corn silk has long been thought of as a waste product; however, due to its numerous therapeutic attributes, it has remarkably gained popularity in Asian and African countries. Therefore, this study aimed to assess the bioactivity of dried corn silk powder (<i>Zea mays</i>, G5417) in terms of its physicochemical and bio-functional characteristics. The protein (15.29 ± 1.23) and ash (5.29 ± 0.29) contents in the corn silk powder were found to be high. The high phenolic content (94.10 ± 0.26 mg GAE/g) and flavonoid content (163.93 ± 0.83 mg QE/100 g) are responsible for its high antioxidant activity. The corn silk powder showed 45.40 ± 0.92% FRSA, 75.25 ± 0.59 TEAC mg/gdw of ABTS, and 86.77 ± 0.88% of FRAP. FT-IR spectroscopy revealed stretching, bending, and vibrations of abundantly present polysaccharides and protein functional groups. Moreover, the DSC thermograph revealed the exothermic reactions at on-set temperature (T<sub>onset</sub>) = 21.9 °C and end temperature (T<sub>endset</sub>) = 102.80 °C, and exothermic reactions at on-set temperature (T<sub>onset</sub>) = 252.02 °C, end temperature (T<sub>endset</sub>) = 296.80 °C, and denaturation peak temperature (T<sub>peak</sub>) = 277.48 °C, whereas XRD (2θ = 21.5°) confirmed the amorphous nature of the corn silk powder. Therefore, due to the potential bioactivity and thermal stability, dry corn silk powder can be scaled up at an industrial level.
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