Impact of thermal processing and solvent extraction on antioxidants in Orobanche coerulescens

Authors

  • Yu-Chin TSAI 1) National Chung-Hsing University, Department of Life Sciences, Taichung, 40227; 2) Ministry of Agriculture, Taichung District Agriculture Research and Extension Station, Changhua, 515008 (TW)
  • Kuan-Hung LIN Chinese Culture University, Department of Horticulture and Biotechnology, Taipei, 11114 (TW)
  • Nguyen Minh Thu LE National Chung-Hsing University, Department of Life Sciences, Taichung, 40227 (TW)
  • Mei-Yun CHANG National Chung-Hsing University, Department of Life Sciences, Taichung, 40227 (TW)
  • Wang-Ping KO O’right International Corporation, Taoyuan, 32544 (TW)
  • Hsin-Yi LAI 1) National Chung-Hsing University, Department of Life Sciences, Taichung, 40227: 2) O’right International Corporation, Taoyuan, 32544 (TW)
  • Hoang Chinh NGUYEN Deakin University, Centre for Sustainable Bioproducts, Geelong, VIC 3216 (AU)
  • Zhao-Min HUANG Tungs' Taichung MetroHarbor Hospital, Stomatology Department, Taichung, 40227 (TW)
  • Jui-Jen CHANG 1) China Medical University, Graduate Institute of Integrated Medicine, Taichung, 40227; 2) China Medical University Hospital, Department of Medical Research, Taichung, 40227 (TW)
  • Meng-Yuan HUANG 1) National Chung-Hsing University, Department of Life Sciences, Taichung, 40227; 2) National Chung-Hsing University, Innovation and Development Center of Sustainable Agriculture, Taichung, 40227 (TW)

DOI:

https://doi.org/10.15835/nbha53414846

Keywords:

bioactive components, extraction concentration, flavonoids; parasitic plants, phenolic acid

Abstract

Orobanche coerulescens traditionally used in herbal medicine and as a nutraceutical, contains important antioxidant compounds. However, the antioxidant profile of O. coerulescens and the process conditions that maximize its antioxidant potential have never been systematically evaluated. This study provides the comprehensive assessment of how thermal processing combined with a range of organic solvent concentrations influences the antioxidant contents and activities of O. coerulescens. Initial screening showed that samples dried at 80 °C and extracted with 95% methanol exhibited the highest 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging ability and reducing power, as well as elevated total flavonoid (TF) and total phenol (TP) contents, compared with samples dried at 40 °C and 60 °C. This identified 80 °C as the optimal drying temperature for enhancing antioxidant properties. Further comparisons of extraction methods revealed that combining 80 °C drying with 40% methanol or ethanol significantly increased DPPH scavenging, while 60% methanol or ethanol under the same drying temperature enhanced reducing power relative to other solvent concentrations and aqueous water-bath treatments. These findings indicate that optimized thermal and solvent conditions improve the antioxidant profile of O. coerulescens for its potential as a valuable natural antioxidant source. Future work should investigate the protective, inhibitory, and functional effects of these optimized extracts in animal models to verify their in vivo bioactivities.

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Published

2025-12-23

How to Cite

TSAI, Y.-C., LIN, K.-H., LE, N. M. T., CHANG, M.-Y., KO, W.-P., LAI, H.-Y., NGUYEN, H. C., HUANG, Z.-M., CHANG, J.-J., & HUANG, M.-Y. (2025). Impact of thermal processing and solvent extraction on antioxidants in Orobanche coerulescens. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 53(4), 14846. https://doi.org/10.15835/nbha53414846

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Research Articles
CITATION
DOI: 10.15835/nbha53414846

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