Bioactive Compounds of Grapefruit (Citrus paradisi Cv. Rio Red) Respond Differently to Postharvest Irradiation, Storage, and Freeze Drying

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• 作者：Jairam Vanamala ; Greg Cobb ; Nancy D. Turner ; Joanne R. Lupton ; Kil Sun Yoo ; Leonard M. Pike ; and Bhimanagouda S. Patil
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2005
• 出版时间：May 18, 2005
• 年：2005
• 卷：53
• 期：10
• 页码：3980 - 3985
• 全文大小：136K
• 年卷期：v.53,no.10(May 18, 2005)
• ISSN：1520-5118

文摘

In the present study, the effect of irradiation, storage, and freeze drying on grapefruit bioactivecompounds was investigated. Grapefruits were exposed to one of two irradiation doses: 0 (control)or 300 Gy (¹³⁷Cs, a proposed treatment against fruit flies) and then stored for up to 6 days. At thelast storage time point (6 days after harvest), grapefruit pulp from control and irradiated fruits wasfreeze-dried. Bioactive compounds were extracted from Rio Red grapefruit pulp and analyzed withreverse phase liquid chromatography while volatile compounds were analyzed using gas chromatography. Freeze-dried pulp from irradiated fruits had a higher (P 0.05) flavonoid content (naringinand narirutin) as compared to the freeze-dried pulp from the control fruits. Freeze-drying treatmentreduced (P 0.05) the lycopene content, but the reduction (P 0.05) in -carotene content occurredonly in the control fruit. Reduction in d-limonene and myrcene was observed in the irradiated fruitsat 6 days after harvest and in the freeze-dried samples. These results warrant testing of the effect ofpostharvest treatments and processing on bioactive compounds in functional systems as they havevaried effects on different bioactive compounds of grapefruit.Keywords: Citrus paradisi; Rutaceae; grapefruit; irradiation; freeze drying; carotenoids; flavonoids;terpenoids