The Influence of Type of Solvent and Extraction Temperature of Corn Silk Extracts

Abstract

Corn silk has not been well-utilized. Actually it has the capacity to develop into functional food because it contains bioactive compounds and high natural antioxidant such as flavonoids and phenolics and positive effects on human health. There are several factors that influence the quality of corn silks extracts, including ratio (raw:solvents) and extraction temperature. This research was couducted to determine the influence of ratio (raw:solvent) and extration temperature of corn silk extracts. The experimental design used Randomized Block Design (RBD) which consisted of two factors and 3 replications. The first factor was type of solvent. All treatment use (raw:solvents) ratio at (1:4). The first factor consists P1=raw:ethanol (1:4)(w/v), P2=raw:methanol (1:4)(w/v), P3=raw:ethyl acetate (1:4)(w/v), and P4=raw:acetone (1:4)(w/v). and the second factor was extraction temperature that consists S1=60°C, S2=70°C, and S3=80°C. Data were analyzed with analysis of variance, followed by Duncan Multiple Range Test (DMRT) test at 5% significant level. Parameters of chemical analysis were included (water, ash, protein, fat, and carbohyrate), and phytochemical analysis were included (total phenol, total flavonoid, activity antioxidant, beta carotene, and vitamin C). The results showed that the type of solvent and extraction temperature of corn silk extracts have significantly effect on water, ash, protein, fat, and, total phenol, total flavonoid, activity antioxidant, beta carotene, and vitamin C. Methanol solvent and extraction temperature at 60°C is the best treatment which have the highest protein and the lowest fat content at 18.22%±1.13 and 0.17%±0.02 respectively, and the highest total phenol, total flavonoid, activity antioxidant, beta carotene, and vitamin C at 8216.89±132.39 μgGAE/g; 234.29±3.98 μgGAE/g; 215.27ppm±3.87; 80.80%±1.84; and 8.84%±0.45 respectively.

Different Drying Duration of Corncobs Powders and Its Effects on Physical, Nutritional and Phytochemical

“…It means that the higher temperature in drying process will decrease the antioxidant activity [68]. The decreased activity antioxidant was also caused by different type solvent and extraction temperature [69]. Data followed by different letter in the same line showed statistically significant (p<0.05).…”

Black Mangrove Powder Extracts with Variation of Temperature and Length of Time using Ultrasound-Assisted Extraction (UAE)

“…This is because a temperature that is too high for a prolonged period causes more water content to evaporate, decreasing the yield, and vice versa, a temperature that is too low causes less water to evaporate, producing a high yield. [6], [34]- [36].…”

“…This is done following earlier studies by [32] and [33], which found that the yield was reduced at higher temperatures and over extended periods. This is because a temperature that is too high for a prolonged period causes more water content to evaporate, decreasing yield, and that a temperature that is too low causes less water to evaporate, increasing yield [6], [34]- [36].…”

Optimization of temperature and extraction time for the nutritional and phytochemical contents of corn bran with ultrasonic-method

“…The higher the temperature and the longer the time of extraction, the lower the yield obtained. This is due to too high temperatures with a long time cause more water content evaporated, resulting in yield decrease, and vice versa, the lower the temperature used, then the less water evaporated so it can obtain the high yield [28]- [31]. 2 shows that, the lowest average of water content obtained on the parameters of A4B4 (65 o C and the temperature-time 25 minutes) at 4.51%, while the highest average of water content is obtained in the A1B1 (50 o C and the temperature is 10 minutes) at 9.77%.…”