Gamma irradiation protects oleic acid from oxidation: an experiment in Lactarius deliciosus wild mushroom

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fij

SOCIEDADE PORTUGUESA

DE

QUfMICA

9-

11th

May

Faculdade de CiE?ncias

Universidade do Porta

Ano lnternacional da QUfMICA 2011

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3PVCheM

3rd

Portuguese

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2012

Book of Abstracts of the 3rd Portuguese Young Chemists Meeting Editors Juliana Oliveira

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Cover Joao Martins

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ISBN 978-989-97667-2-3

This book is a compilation of the abstracts submitted by the authors for

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P12 Pressure waves generated by light-absorbing thin films

A. P. Marques. G. F. F. Sa, C. Serpa and L. G. Arnaut

Universidade de Coimbra, Portugal

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P13 Thermodynamic study of phase transitions in methyl esters of ortho-, meta- 72 and para-aminobenzoic acids

Ana R. R. P. Almeida and M. J. S. Monte

Faculdade de Ciencias, Universidade do Porta, Portugal

P14 Monovacant polyoxometalates @ Mll-101: synthesis and heterogeneous 73

catalytic studies

Andre D. S. Barbosa. Filipe A. Almeida Paz, Baltazar de Castro, Salete S. Balula and Lufs Cunha-Silva

Faculdade de Ciencias, Universidade do Porta, Portugal

P15 Isolation and quantification of labdanolic acid from Cistus ladaniferus

Andre N. C. Martins. L. M. T. Frija, S. Simeonov and C. A. M. Afonso

Faculdade de Farmcicia, Universidade de Lisboa I lnstituto Superior Tecnico, Portugal

P16 Application of geochemistry software to corrosion studies

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Universidode de Aveiro, Portugal

P17 Micro-electrochemical techniques to study localised corrosion

A. B. Oliveira, A. C. Bastos, 0. V. Karavai, M. L. Zheludkevich and M. G. S. Ferreira

Universidade de Aveiro, Portugal

74

75

76

P18 Approach to the synthesis of nucleoside inhibitors of butyrylcholinesterase 77

Andreia Almeida, Vasco Cachatra and Amelia P. Rauter

Facu/dade de Ciencias, Universidade de Lisboa, Portugal

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Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Portugal

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79

P21 Topical drug delivery of lidocaine and diclofenac gels: Viscoelastic properties 80 and in vitro skin distribution studies

Angela Correia. Gon~alo F. F. Sa, Carlos Serpa and Luls G. Arnaut

P22 Computational studies of Binol based phosphites and respective metal 81

complexes at PM6 and DFT levels. Application in asymmetric hydrogenation of olefins.

Angela C. B. Neves, Rui M. B. Carrilho, Andreia F. Peixoto, Ana R. Almeida, Paulo E. Abreu, M. Calvete and Mariette M. Pereira

P23 Gamma irradiation protects oleic acid from oxidation: an experiment in 82

Lactarius de/iciosus wild mushroom

Angela Fernandes, M. Beatriz P. P. Oliveira, Amilcar L. Antonio, Anabela Martins and lsabel

c.

F. R. Ferreira

lnstituto Politfknico de Bragan~a I Faculdade de Farmacia, Universidade do Porta, Portugal

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Posters

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Gamma irradiation protects oleic acid from oxidation: an

experiment

in

Lactarius deliciosus wild

mushroom

Angela Fernandes1•2, M. Beatriz P. P. Oliveira2, Amilcar L. Antonio1•3•4, Anabela Martins1

and Isabel C. F. R. Ferreira1·* -·

1

CIMO/ESA, Instituto Politecnico de Braganya, Portugal

2_{REQUIMTE/Dt. Ciencias Quimicas}_,_{Faculdade de Farmacia, Universidade do Porto, Portugal}

3_{GTRPP/Unidade}_{de Fisica e}_{Aceleradores,}_{Instituto Tecnologico e Nuclear,}_Portugal

4

Departamento de Fisica Fundamental, Universidade de Salamanca, Spain

*iferreira@ipb.pt

The short shelf-life of mushrooms is an obstacle to the distribution and marketing of the fresh product. Thus, prolonging postharvest storage, while preserving their quality, would benefit the mushroom industry as well as consumers (1]. There has been extensive research on finding the most appropriate technology for mushrooms preservation and a particular interest arises for wild species. Treatment by irradiation emerges as a possible conservation technique that has been tested successfully in several food products and is regulated in the European Union by the Directive

1999/2/EC.

In the present work, the influence of gamma irradiation dose (0.5 and 1 kGy) over the fatty acids profile of Lactarius deliciosus L. wild mushroom, collected in the Northeast of Portugal (November 2011), was evaluated by gas-chromatography coupled to flame ionization detection (GC-FID). The analyses were performed after 0, 4 and 8 days of storage at 4

oc

in irradiated and non-irradiated samples (control). The control and the irradiated samples revealed an identical profile, with C18:0 (stearic acid), Cl8:2n6c (linoleic acid), Cl8:ln9c (oleic acid) and Cl6:0 (palmitic acid) as main fatty acids. These results are in agreement to the reported by our research group in a previous study with nutritional characterization of this species [2]. Nevertheless, some differences were found in the percentage of some fatty acids in the different samples, mainly in oleic acid. Control sample (non-irradiated) after 8 days of storage, showed a lower C18:1n9c percentage (decreased from 8 to 4.4%) contributing to a decrease in monounsaturated fatty acids (MUF A) levels. Otherwise, in the sample irradiated with 0.5 kGy the percentage of the mentioned fatty acid did not changed until day 8.

Overall, irradiation could be an alternative to ensure the quality and extend the life of mushrooms, protecting their fatty acids from oxidation, as is was demonstrated herein for oleic acid. In fact, food irradiation is now being commonly used in many countries, as people are becoming more aware of the role of food irradiation in regards to food safety and product shelf-life extension.

Acknowledgements: The authors are grateful to the Foundation for Science and Technology (FCT, Portugal)

for financial support to the research center CIMO (PEst-OE/AGRIUI0690/2011) and REQUIMTE (PEst-C/EQB/LA0006/2011). A. Femandes thanks to FCT, POPH-QREN and FSE for her grant (SFRH/BD/76019/2011).

[1] Akram, K.; Kwon, J. H., J. Korean Soc. Appl. Bioi. Chem. 2010, 53,257-265.

[2] Barros, L.; Baptista, P.; Correia, D. M.; Morais, J. S.; Ferreira, I. C. F. R., J. Agric. Food Chem.

2007, 55, 4781-4788.

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3rd Portuguese Young Chemists Meeting

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Departamento de Quimica e Bioqufmica

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This book is a compilation of the highlights submitted by the authors for presentation at the meeting. There were

introduced only minor editing alterations that do not change the scientific content. The scientific content is sole the responsibility of the authors.

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Gamma irradiation protects oleic acid from oxidation: an experiment in Lactarius de/iciosus wild mushroom

Angela Fernandes, M. Beatriz P. P. Oliveira, Amilcar L. Antonio, Anabela Martins and Isabel C. F. R. Ferreira·

lnstituto Politecnico de Braganr;al Faculdade de Farmcicia da Universidade do Por/o, Portugal.

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Control and irradiated L. deliciosus samples revealed identical fatty acid profiles.

Control sample showed a lower C18:ln9c content after 8 days of storage .

Sample irradiated with 0.5 kGy maintained Cl8:1n9c content until day 8 .

Irradiation protected fatty acids from oxidation .

Irradiation could be an alternative to extend the life of mushrooms .

1,3-Dipolar Cycloaddition of (2R,4aR,8aS)-2-phenyl-4,4a-dihyd ropyrano [3,2-d] [ 1,3 ]dioxin-6(8aH)-one

with Aromatic Diazomethyl Compounds

Ant6nio Ribeiro. Cristina E. A. Sousa, M. Jose Alves and A. Gil Fortes

Universidade do Minho, Portugal •antonio.manuel.p.ribeiro@gmail.com

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