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363

Comparison of Chemical Compositions, Nutritional Values, Antioxidant and
Tyrosinase Inhibition Activities in Corn Silk of Three Different Corn Varieties
,‡
Noppadol Hongsuwan* , Khaetthareeya Sutthanut †
*School of Thai Traditional Medicine, Faculty of Natural Resources, Rajamangala University of Technology
Isan Sakon Nakhon Campus, Sakon Nakhon 47160, Thailand
† Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Khon Kaen University, Khon Kaen 40002,
Thailand
‡
Corresponding author: noptmc0550@gmail.com

Abstract

There is a lot of corn silk as waste from the corn-related industry. This study was conducted to
compare the properties of corn silk derived from three different corn varieties: bicolor sweet corn (Zea mays
L. var. saccharata), sweet corn (Zea mays saccharata), and waxy corn (Zea mays ceratina) - chemical
compositions, nutritional values, antioxidant and tyrosinase inhibition activities. Crude corn silk extracts of
three varieties were tested for chemical elements using thin layer chromatography assay. The results showed
that 50% ethanolic extract of corn silk contained phenolic compounds and flavonoids. Nutritional proximate
analyses revealed highest moisture content of 10.26 ± 0.66% in sweet corn, highest ash content of 6.43 ± 1.77%
in waxy corn silk, highest fat content of 0.29 ± 0.17% in sweet corn silk, highest fiber content of 14.13 ±

0.44% in waxy corn silk, highest protein content of 21.19 ± 0.61% in sweet corn silk, and highest carbohy-
drate content of 61.59 ± 1.06% in bicolor sweet corn silk. As for antioxidant activity comparison using the
DPPH radical scavenging method, the extract from sweet corn silk had the best IC value at 5991.98 ± 60.61
50
μg/ml. Regarding tyrosinase inhibition comparison, the extract from waxy corn silk showed the best IC
50
value at 3082.28 ± 347.98 μg/ml. This study has shown the results of nutritional value analyses as well as
biological activities of corn silk, which can be used as a basis for developing health-care and cosmetic (skin-
whitening) products.

Key words: corn silk, nutritional value, antioxidant, antityrosinase

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