Modified atmosphere packaging and post-packaging irradiation of Rumex induratus leaves: a comparative study of postharvest quality changes
The effects of conventional and inert-gas enriched atmospheres, as well as those caused by different γ-irradiation doses, on buckler sorrel (Rumex induratus) leaves quality were evaluated and compared after 12 days of storage at 4 °C. The green colour of the abaxial surface of the leaves was relatively stable, as well as the carbohydrates content and the calorific value. The storage time decreased the amounts of fructose, glucose, trehalose, α-tocopherol, and β-tocopherol and increased the levels of total organic acids and δ-tocopherol. The total tocopherols content was higher in air-packaged non-irradiated leaves, antioxidant compounds that may have contributed to the preservation of polyunsaturated fatty acids (PUFA). Some antioxidant properties were also favoured during storage. It was found that the overall postharvest quality of buckler sorrel leaves is better maintained with the argon-enriched atmospheres, while the 6 kGy dose was a suitable option to preserve PUF+A during cold storage. This study highlights the suitability of the applied postharvest treatments and the interest to include buckler sorrel leaves in contemporary diets.
KeywordsRumex induratus Buckler sorrel Modified atmosphere packaging Gamma irradiation Cold storage Postharvest quality
The authors are grateful to PRODER research project no. 53514, AROMAP, for financial support of the work and to the Foundation for Science and Technology (FCT, Portugal) for financial support to CIMO (PEst-OE/AGR/UI0690/2014), REQUIMTE (PEst-C/EQB/LA0006/2014), C2TN (RECI/AAG-TEC/0400/2012), and for the grants SFRH/BD/92994/2013, SFRH/BPD/72802/2010 and SFRH/BPD/107855/2015.
- AOAC (2005) Official methods of analysis of AOAC international, 18th edn. AOAC International, GaithersburgGoogle Scholar
- Carvalho AM (2010) Plantas y sabiduría popular del Parque Natural de Montesinho. Un estudio etnobotánico en Portugal. Biblioteca de Ciencias no. 35. Consejo Superior de Investigaciones Científicas, Madrid, EspañaGoogle Scholar
- Choi DS, Park SH, Choi SR, Kim JS, Chun HH (2014) The combined effects of ultraviolet-C irradiation and modified atmosphere packaging for inactivating Salmonella enterica serovar Typhimurium and extending the shelf life of cherry tomatoes during cold storage. Food Packag Shelf Life 3:19–30. doi: 10.1016/j.fpsl.2014.10.005 CrossRefGoogle Scholar
- Dey PM, Harborne JB (1997) Plant biochemistry. Academic Press, LondonGoogle Scholar
- Fernandes Â, Barreira JCM, Antonio AL, Oliveira MBPP, Martins A, Ferreira ICFR (2016) Extended use of gamma irradiation in wild mushrooms conservation: validation of 2 kGy dose to preserve their chemical characteristics. LWT Food Sci Technol 67:99–105. doi: 10.1016/j.lwt.2015.11.038 CrossRefGoogle Scholar
- Hallman GJ (2016) Process control in phytosanitary irradiation of fresh fruits and vegetables as a model for other phytosanitary treatment processes. Food Control. doi: 10.1016/j.foodcont.2016.02.010
- Hussain PR, Suradkar P, Javaid S, Akram H, Parvez S (2016) Influence of postharvest gamma irradiation treatment on the content of bioactive compounds and antioxidant activity of fenugreek (Trigonella foenum-graceum L.) and spinach (Spinacia oleracea L.) leaves. Innov Food Sci Emerg Technol 33:268–281. doi: 10.1016/j.ifset.2015.11.017 CrossRefGoogle Scholar
- ICGFI (1999) Facts about food irradiation: a series of fact sheets from the International Consultative Group on Food Irradiation. International Consultative Group on Food Irradiation, ViennaGoogle Scholar
- Ito VC, Alberti A, Avila S, Spoto M, Nogueira A, Wosiacki G (2016) Effects of gamma radiation on the phenolic compounds and in vitro antioxidant activity of apple pomace flour during storage using multivariate statistical techniques. Innov Food Sci Emerg Technol 33:251–259. doi: 10.1016/j.ifset.2015.12.015 CrossRefGoogle Scholar
- Pinela J, Antonio AL, Barros L, Barreira JCM, Carvalho AM, Oliveira MBPP, Santos-Buelga C, Ferreira ICFR (2015) Combined effects of gamma-irradiation and preparation method on antioxidant activity and phenolic composition of Tuberaria lignosa. RSC Adv 5:14756–14767. doi: 10.1039/C4RA14944K CrossRefGoogle Scholar
- Pinela J, Barreira JCM, Barros L, Antonio AL, Carvalho AM, Oliveira MBPP, Ferreira ICFR (2016) Postharvest quality changes in fresh-cut watercress stored under conventional and inert gas-enriched modified atmosphere packaging. Postharvest Biol Technol 112:55–63. doi: 10.1016/j.postharvbio.2015.10.004 CrossRefGoogle Scholar
- WHO (1999) High-dose irradiation: Wholesomeness of food irradiated with doses above 10 kGy. Report of a joint FAO/IAEA/WHO study group. World Health Organization, GenevaGoogle Scholar