Antioxidant Properties of Various Extracts from Laoying Tea (Litsea coreana L.)

Abstract:

Laoying Tea, leaves of Litsea coreana L., is conventionally consumed as healthy tea beverage in southern China for hundreds of years. The ethanolic, cold water and hot water extracts were prepared and their antioxidant properties studied. At 160 µg/mL, the cold water extract showed a high reducing power of 1.056. With regard to the scavenging ability on 1,1-diphenyl-2-picrylhydrazyl radicals, extracts were effective in the order: ethanolic > cold water > hot water extracts. EC₅₀ values for chelating ability on ferrous ions for ethanolic, cold water and hot water extracts were 10.23, 0.85 and 1.12 mg/mL, respectively. Total phenols were the major naturally occurring antioxidant components found and were in the order: cold water > hot water > ethanolic extracts. Based on EC₅₀ values, the various extracts from laoying tea were effective antioxidants.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 45-49
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.45
• Online since: January 2011
• Authors: Hong Fang Ji, Ling Wen Zhang, Hai Yan Zhang, Ming Duo Yang, Jian Li
• Keywords: Antioxidant Activity, Antioxidant Components, Laoying Tea, Litsea coreana L.

References

[1] R. B. Singh and D. Downing: Journal of Nutritional and Environmental Medicine Vol. 5(1995), pp.219-224.

[2] A. A. M. Botterweck, H. Verhagen and R. A. Goldbohm et al.: Food and Chemical Toxicology Vol. 38(2000), pp.599-605.

[3] J.P. u and L.Q. Gu: Journal of Plant Resources and Environment Vol. 10 (2001), pp.61-62.

[4] J.Q. Wang, J. Li and Y.H. Zou et al.: Journal of Ethnopharmacology. Vol. 121(2009), pp.54-60.

[5] J.H. Liu: Chinese Journal of the Practical Chinese Modem Medicine Vol. 3(2003), p. (2057).

[6] M. Oyaizu: Japanese Journal of Nutrition Vol. 44 (1986), pp.307-315.

[7] T. Sun and C. Ho: Food Chemistry Vol. 90 (2005), pp.743-749.

[8] T.C.P. Dinis, V.M.C. Madeira and L.M. Almeida: Archives of Biochemistry and Biophysics Vol. 315(1994), pp.161-169.

[9] B.P. Klein and A. K. Perry: Journal of Food Science Vol. 47 (1982), pp.941-945, 948.

[10] Z. Fang, Y. Zhang and Y. Lü et al.: Food Chemistry Vol. 113(2009), pp.884-888.

[11] M.I. Moreno, M.I. Isla and A.R. Sampietro et al.: Journal of Ethnopharmacology Vol. 71(2000), pp.109-114.

[12] H. J. D. Dorman, A. Peltoketo and R. Hiltunen et al.: Food Chemistry Vol. 83(2003), pp.255-262.

[13] A. Yildirim, A. Mavi and A.A. Kara: Journal of Agricultural and Food Chemistry Vol. 49 (2001), pp.4083-4089.

[14] G. C. Yen and D.Y. Chung: Journal of Agricultural and Food Chemistry Vol. 47(1999), pp.1326-1332.

[15] Y.L. Lee, M.T. Yen and J.L. Mau: Food Chemistry Vol. 104(2007), pp.1-9.

[16] S. Abidi and A. Ali: Cancer Letters Vol. 142(1999), pp.1-9.

[17] D. A. Gray, M. J. Clarke and C. Baux et al.: Journal of Cereal Science Vol. 36(2002), pp.209-218.

[18] W. C. Hou, R. D. Lin and T. H. Lee et al.: Journal of the Science of Food and Agriculture Vol. 85(2005), pp.615-621.

[19] N. Cotelle, J. L. Bemier and J.P. Catteau et al.: Free Radical Biology and Medicine Vol. 20(1996), pp.35-43.

[20] M. Wettasinghe and F. Shahidi: Food Research International Vol. 35 (2002), pp.65-71.