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Effect of γ-irradiaton on the volatile compounds of licorice (Glycyrrhiza uralensis Fischer)

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Abstract

The volatile compounds of non-irradiated and 1, 3, 5, 10 and 20 kGy γ-irradiated roots of licorice (Glycyrrhiza uralensis Fischer) were isolated by simultaneous distillation–extraction (SDE) technique and analyzed by gas chromatography-mass spectrometry (GC-MS). A total of 61 volatile compounds belonging to the chemical classes of acid (2), alcohol (16), aldehyde (8), ester (6), furan (2), hydrocarbon (14), ketone (10) and N-containing compounds (3) were identified in non-irradiated licorice. The prime volatile compound of licorice was 2-ethoxy-1-propanol, which makes up to 22.82% of the total composition. Over a dose of 1 kGy, another compound, benzaldehyde appeared, whereas other compounds, 3,5-dimethyl octane and phenethyl alcohol, disappeared at the dose of 20 kGy. Though the content of several volatile compounds increased after γ-irradiation, the content of major volatile compounds such as 4-terpineol, myrtenal, tetramethylpyrazine, hexanoic acid, azulene and p-cymene decreased. In comparison to non-irradiated licorice, 10 kGy dose of irradiation induced the maximum level of total yield of volatile compounds by 12%, but slightly decreased at 20 kGy. Therefore, the application of γ-irradiation is feasible without major qualitative and quantitative loss of volatile compounds when exposed at 10 kGy.

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Acknowledgement

This research was performed for the Nuclear R&D Programs funded by the Ministry of Science & Technology (MOST) of Korea.

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Authors and Affiliations

  1. Department of Food and Nutrition, Chosun University, Dong-gu, Gwangju, 501-759, South Korea

    Hye-Young Seo, Sung-Lye Shim, Keun-Young Ryu, Won Kim & Kyong-Su Kim

  2. Department of Applied Science, Chosun University, Dong-gu, Gwangju, 501-759, South Korea

    Rajendra Gyawali

  3. Faculty of Marine Bioscience and Technology, Kangnung National University, Gangneung, Gangwon, 210-702, Korea

    Sang Guan You

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  1. Rajendra Gyawali
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  2. Hye-Young Seo
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Correspondence to Kyong-Su Kim.

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Gyawali, R., Seo, HY., Shim, SL. et al. Effect of γ-irradiaton on the volatile compounds of licorice (Glycyrrhiza uralensis Fischer). Eur Food Res Technol 226, 577–582 (2008). https://doi.org/10.1007/s00217-007-0591-2

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  • DOI: https://doi.org/10.1007/s00217-007-0591-2

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