Indian Journal of Agricultural Research

  • Chief EditorV. Geethalakshmi

  • Print ISSN 0367-8245

  • Online ISSN 0976-058X

  • NAAS Rating 5.60

  • SJR 0.293

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Indian Journal of Agricultural Research, volume 54 issue 5 (october 2020) : 563-570

Study of the Procedure for Bath Ultrasound-Assisted Extraction of Total Flavonoid from Lotus Seeds and Testing Some Biological Activities

D.T. Long, H.T. Kim Hong, L.L. Thuy Tram, N.T. Quynh Trang, N.P. Thuy Tien, N.T. Ngoc Hanh
1Hue University of Sciences, Hue University, Vietnam.
Cite article:- Long D.T., Hong Kim H.T., Tram Thuy L.L., Trang Quynh N.T., Tien Thuy N.P., Hanh Ngoc N.T. (2020). Study of the Procedure for Bath Ultrasound-Assisted Extraction of Total Flavonoid from Lotus Seeds and Testing Some Biological Activities. Indian Journal of Agricultural Research. 54(5): 563-570. doi: 10.18805/IJARe.A-525.
In this study, we investigated impact of single factor: solvent concentration ethanol, solvent pH, ultrasound time, solvent ratio: raw material and ultrasound temperature on the total flavonoid extraction from lotus seeds. Based on survey on factors affecting extraction conditions by the ultrasound bath method, all five surveyed factors were found to have strong influences on total flavonoid extraction process. From factorial design of experimental planning using surface response methodology (RSM), optimal conditions for extraction of total flavonoid from lotus seeds were found in extraction time (98.005 min); solvent concentration ethanol (86.160 %), pH solvent ethanol (4.546), bath ultrasound temperature (22.210°C) and solvent/material ratio (8.376 (v/w)). Under above optimum conditions, total extracted flavonoids was 0.812 (mg Catechin/g extract). Experimental results showed a high compatibility with estimated RSM model. Total flavonoid content obtained in the original liquid extract was 0.797 ± 0.011 (mg Catechin/g extract). The highest antioxidant activity was found to be from ethanol extract with IC50 value (0.058 ± 0.004 (µg/mL), in comparison with IC50 of ascorbic acid, 0.002 ± 0.001 (µg/mL). Moreover, 50 % of DPPH scavenging ability of liquid and condensed extract differed from each other.
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