Effect of gamma radiation processing on turmeric: Antioxidant activity and curcumin content

The aim of this study was to evaluate the effectiveness of gamma radiation from 60Co at doses 0, 5, 10, 15 and 20 kGy on turmeric (Curcuma longa Linn.). The quantification of phenolic compounds was performed by Folin-Ciocalteu method and assessing the potential of antioxidant activity by the free ra...

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Bibliographic Details
Published inRadiation physics and chemistry (Oxford, England : 1993) Vol. 152; pp. 12 - 16
Main Authors Almeida, Mariana Corrêa, Sampaio, Geni Rodrigues, Bastos, Deborah Helena Marcowicz, Villavicencio, Anna Lucia C.H.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.11.2018
Elsevier BV
Subjects
Antioxidant activity
Antioxidants
Bioactive compounds
Chromatography
Chronic illnesses
Contamination
Curcumin
Food radiation
Free radicals
Gamma rays
High performance liquid chromatography
Irradiation
Phenols
Radiation
Scavenging
Turmeric
Turmeric
Curcumin
Food radiation
Bioactive compounds
Antioxidant activity
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Summary:The aim of this study was to evaluate the effectiveness of gamma radiation from 60Co at doses 0, 5, 10, 15 and 20 kGy on turmeric (Curcuma longa Linn.). The quantification of phenolic compounds was performed by Folin-Ciocalteu method and assessing the potential of antioxidant activity by the free radical [2,2 difenil-1-pricril-hidrazil (DPPH•)] scavenging and by Rancimat® method. The curcumin quantification was performed by High Performance Liquid Chromatography. Compared to control, there were significant losses (p < 0,05) of total phenolic compounds in the samples irradiated with 15 kGy (p = 0001) and 20 kGy (p = 0001). Regardless the irradiation, there was no decrease in the ability to scavenge free radicals. The Antioxidant Activity Index (Rancimat® method) was significantly lower (p < 0,05) in 5 kGy (p < 0001) and 15 kGy (p = 0003) irradiated extracts and the curcumin quantification was significantly lower (p < 0,05) in 15 kGy irradiated extract (p < 0001). It is concluded that gamma radiation processing technology on turmeric can be viable. To maintain safety of antioxidant activity it should be applied doses up 10 kGy. •We evaluated the effects of gamma radiation on turmeric in doses up to 20 kGy.•15 and 20 kGy decreased total phenolic compounds.•5 and 15 kGy decreased AAI, but not the ability to scavenge free radicals.•Curcumin quantification was lower in samples irradiated by 15 kGy.•Doses up to 10 kGy should be applied.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2018.07.008