Effect of Particle Size on Physico-Chemical Properties and Antioxidant Activity of Corn Silk Powder

Abstract

The study was carried out to analyze the relationship between analysis of antioxidant activity and the level of functional components according to particle size of corn silk. Particle size was classified into 5 groups. By particle size distribution and color difference, the total phenol content and DPPH radical scavenging activity were observed. The particle sizes of corn silk were 199.17 ㎛, 178.27 ㎛, 85.48 ㎛, 27.4 ㎛ and 20.97 ㎛, respectively. The lightness of colored pigments was increased when the particle size was decreased. The contents of free sugar (fructose, glucose, galactose, sucrose, and maltose) of corn silk were analyzed using a HPLC. The total phenol contents by the particle sizes of corn silk were 2.01 mg/g, 2.02 mg/g, 2.06 mg/g, 2.26 mg/g and 2.26 mg/g, respectively. DPPH radical scavenging activities of samples were 21.00%, 21.75%, 22.90%, 24.35% and 23.67%, respectively. Antioxidative activities of Trolox and Fe(II) in corn silk were measured by ferric reducing antioxidant power (FRAP) assay and Trolox equivalent antioxidant capacity (TEAC) assay. TEAC values of samples were 2.36 μmol TE / g dw, 2.81 μmol TE / g dw, 3.20 μmol TE / g dw, 3.36 μmol TE / g dw, and 3.44 μmol TE / g dw, respectively. FRAP values of samples were 11.67 μmol Fe(II) / g dw, 12.80 μmol Fe(II) / g dw, 13.43 μmol Fe(II) / g dw, 13.85 μmol Fe(II) / g dw and 15.95 μ mol Fe(II) / g dw, respectively. Total phenolic content and antioxidantive activities based on FRAP assay and TEAC assay were increased with decreasing particle size. In addition, DPPH radical scavenging activity was also increased. A significant correlation was also noted between DPPH radical scavenging activities and the content of phenolic compounds.

Effect of Roasting Time and Cryogenic Milling on the Physicochemical Characteristics of Dried Ginseng Powder

“…These results were also in agreement with the findings of a previous study that showed that TPCs displayed an increasing pattern as the particle size decreased in five treatments with various particle sizes (M1, 199.17 μm; M2, 178.27 μm; M3, 85.48 μm; M4. 27.04 μm; and M5 20.97 μm) [42]. This phenomenon was explained by the particle size-extraction relationship, indicating that phenolic compounds were easily released due to an increase in the specific surface area as the particle size decreased [37].…”

Effect of Roasting Time and Cryogenic Milling on the Physicochemical Characteristics of Dried Ginseng Powder

“…These results were also in agreement with the findings of a previous study, in which TPCs displayed an increasing pattern as the particle size decreased in five treatments with various particle sizes (M1, 199.17 µm; M2, 178.27 µm; M3, 85.48 µm; M4. 27.04 µm; and M5 20.97 µm) [41]. This phenomenon was explained by the particle size-extraction relationship, indicating that phenolic compounds were easily released due to an increase in the specific surface area as the particle size decreased [36].…”

Exploring the Effect of Nanotechnology Process on Physical and Chemical Properties of Herbs: A Short Review.

“…Increases in the lightness intensity due to the particle size reduction were observed in corn silk and wheat bran (Cha et al, 2012;Majzoobi et al, 2014). While in another study by Tsai et al (2011) they reported that more vivid redness intensities (a* value) of betanin and total betacyanin were observed in the nanoparticle C. formosanum as compared to the coarse particle.…”