Comparison of physiological activities and of useful compounds between new and waste bulbs of different lily (Lilium davidii) varieties

Tae Gyu Yi1   Yeri Park1   Su Jin Yang2   Jung Dae Lim2   Sang Un Park3   Kyong Cheul Park4,*   Nam Il Park1,*   

1Department of Plant Science, Gangneung-Wonju National University,
2Department of Herbal Medicine Resource, Kangwon National University
3Department of Crop Science, Chungnam National University
4Department of Agriculture and Life Industry, Kangwon National University

Abstract

Lily (Lilium davidii) is a high-yielding flowering plant. Besides roses and chrysanthemums, lily bulbs have long been used as food and in oriental medicine. However, the usage and value of cut lily bulbs has not been recognized. A bulb whose yield has been decreased is called a waste bulb, and a large amount of such bulbs is discarded every year. In this study, the functionality of waste bulbs from cut lilies was investigated to explore their potential use as a value-added product. We divided lily bulbs into two groups, one group with six varieties of new bulbs (Medusa, Siberia, Woori Tower, Yelloween, Le Reve, and Morning Star) used for cultivation and the other group with six varieties of waste bulbs (Medusa, Siberia, Woori Tower, Yelloween, Sorbonne, and Sheila). Physiological activities (α,α-diphenyl-β-picrylhydrazyl: DPPH) and 3-ethlbenzthiazolne-6-sulfonic acid (ABTS) radical scavenging capability and tyrosinase inhibiting activity), the amount of total as well as eight individual phenolic compounds (chlorogenic acid, epicatechin, rutin hydrate, p-coumaric acid, kaempferol 3-O-β-rutinoside, phloridzin dihydrate, myricetin, and quercetin), and total flavonoid content were measured in the bulbs by high performance liquid chromatography. We detected high amounts of total phenol and total flavonoid as well as high DPPH and ABTS radical scavenging ability. More tyrosinase inhibiting activity was detected in the new bulbs than in the waste bulbs. However, both the new and waste bulbs showed a higher inhibitory activity than the standard (100 ppm ascorbic acid). Although the content of phenolic compounds differed among varieties, under the conditions of the experiment, the most abundant phenolics were epicatechins, followed by chlorogenic acid, and rutins. Overall, the waste bulbs had a higher content of these compounds than the new bulbs. Based on these results, we concluded that bulbs from cut lilies could be used as functional foods in the future and farmers could expect economic gain from the hitherto neglected waste bulbs.

Acknowledgements

이 연구는 2015년 사단법인 한국백합생산자중앙연합회에서 지원된 연구비에 의해 진행되었음.

Figures & Tables

Total phenolic contents in new and waste bulbs from six lily varieties. The data represent the average values of three replicates in independent experiments, and the error bars reflect mean ± SD (standard deviation) values.