New University of Lisbon, Portugal
Title: Effects of cooking process on the chemical composition and functional properties of sweet potato
Elvira Gaspar has completed her PhD from New University of Lisbon in 1994. Elvira Gaspar currently working as a assistant professor in the New University of Lisbon is well known for her research in areas of Analytical and green chemistry. She completed her Doctoral research working at Faculty of Sciences and Technology in University of Lisbon. Since 1984, she has been Regent and Professor of different disciplines of Chemistry Department of Faculty of Science and Technology of New University of Lisbon including Organic Chemistry, Chemical Information and Documentation. She is also serving as a member of Scientific Board of Brazilian publication: Orbital - The Electronic Journal of Chemistry. Elvira has been active many of the well known chemical societies and associations. She has also worked for a start up, Airmarkers a new medical screening methodologies company, proof of concept.
Worldwide, sweet potato is considered the sixth most important food crop. Alongside with its nutritional value, it is also recognized as a healthy and functional food due to the bioactive compounds present in its chemical composition. Lira is a variety of sweet potato cultivated in south Portugal, Aljezur. It is considered a product of Protected Geographical Indication (PGI) due to its distinctive features, longstanding tradition of cultivation and the fact that it is grown in a specific region of production.
The consumption of sweet potato is essentially undertaken after being cooked. The characteristic aroma is chemically dominated by the presence of furan derived compounds produced by Maillard reaction. This work involved the qualitative and quantitative study of aroma composition in order to compare the effect of cooking processes – baking, boiling and microwaving – on chemical composition and some functional properties of sweet potato.
Using headspace (HS) and direct immersion (DI) solid phase micro-extraction gas chromatography coupled to mass spectrometry (SPME-GC-MS) analysis, 2-furaldeyde, 2-acetylfuran, benzaldehyde, 5-methylfurfural, phenylacetaldehyde and furfuryl alcohol were identified in the aromas of cooked Lira sweet potato. Differences of composition and content were shown to be dependent on the cooking process.
The study illustrates how food processing may change chemical composition of food. Because humans are what they eat, the study contributes to verify how cooking choices may influence human health and well-being.