Comparison of Ozone and UV-C Treatments on the Postharvest Stilbenoid Monomer, Dimer, and Trimer Induction in Var. 'Superior' White Table Grapes
详细信息 查看全文
- 作者：Rocí ; o Gonzá ; lez-Barrio ; David Beltrá ; n ; Emma Cantos ; Marí ; a I. Gil ; Juan Carlos Espí ; n ; and Francisco A. Tomá ; s-Barberá ; n
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2006
- 出版时间：June 14, 2006
- 年：2006
- 卷：54
- 期：12
- 页码：4222 - 4228
- 全文大小：568K
- 年卷期：v.54,no.12(June 14, 2006)
- ISSN：1520-5118
文摘
Postharvest treatment of seedless white table grapes (var. 'Superior') with different gas ozoneconcentrations (3.88 and 1.67 g/h) for 1, 3, and 5 h induced an increase in stilbenoid biosynthesis[trans-resveratrol, piceatannol, and viniferinas (resveratrol dehydrodimers and dehydrotrimers)] duringstorage at 22 
C and 95% relative humidity. The maximal resveratrol concentration was reachedafter 2 days of storage, and this amount was similar to that induced by optimized UV-C treatments(1 min, 510 W, 40 cm). Although similar resveratrol concentrations accumulated in grapes after bothUV-C and O3 treatments (maximum ozone production and time), the ozone treatment was moreefficient in inducing viniferins accumulation in grape berries. A sequence in the biosynthesis ofstilbenoids was observed, starting with the resveratrol monomer, continuing with the resveratroldehydrodimers 
-viniferin and 
-viniferin, and ending with four different resveratrol dehydrotrimers.These trimers were different from 
-viniferin, a trimer previously reported to be induced in grapesafter biotic and abiotic stresses. Two -viniferin isomers were also detected in the ozone-treatedgrapes, although at very low concentrations that prevented their quantification.Keywords: Table grapes; postharvest; ozone; resveratrol; stilbenoids; viniferins; dehydrodimers;dehydrotrimers; UV-C
C and 95% relative humidity. The maximal resveratrol concentration was reachedafter 2 days of storage, and this amount was similar to that induced by optimized UV-C treatments(1 min, 510 W, 40 cm). Although similar resveratrol concentrations accumulated in grapes after bothUV-C and O3 treatments (maximum ozone production and time), the ozone treatment was moreefficient in inducing viniferins accumulation in grape berries. A sequence in the biosynthesis ofstilbenoids was observed, starting with the resveratrol monomer, continuing with the resveratroldehydrodimers -viniferin and -viniferin, and ending with four different resveratrol dehydrotrimers.These trimers were different from -viniferin, a trimer previously reported to be induced in grapesafter biotic and abiotic stresses. Two -viniferin isomers were also detected in the ozone-treatedgrapes, although at very low concentrations that prevented their quantification.Keywords: Table grapes; postharvest; ozone; resveratrol; stilbenoids; viniferins; dehydrodimers;dehydrotrimers; UV-C