Effect of roasting on tocopherols of gourd seeds (Cucurbita pepo)


  • Gemrot François Cirad-Amis, UR N°24 Food quality, TA 40/16, 34398 Montpellier Cedex 5
  • Barouh Nathalie Cirad-Amis, UR N°24 Food quality, TA 40/16, 34398 Montpellier Cedex 5
  • Vieu Jean-Pierre Exploitation agricole Les fleurs de Jaussely
  • Pioch Daniel Cirad-Amis, UR N°24 Food quality, TA 40/16, 34398 Montpellier Cedex 5
  • Montet Didier Cirad-Amis, UR N°24 Food quality, TA 40/16, 34398 Montpellier Cedex 5




Cucurbita pepo, Gourd, Roasting, Tocopherol, Vitamin E


The effect of roasting at high temperatures on the Vitamin E in hulled gourd seeds of Cucurbita pepo was studied. Roasting at 140°C for 5 min induced a swelling of the seed with an increase in volume of 43 %, and a weight loss of 6.5 %.The seed acquired the desired puffed-up appearance. The water activity of raw seeds was 0.544 and decreased during roasting to 0.105. Cucurbita pepo seeds contained 51.0 % fat. Tocopherol content of roasted seeds was 68mg/100g oil and of non roasted seeds was 107mg/100g oil. γ-tocopherol represented 96% of the total tocopherols. Total tocopherol loss during roasting was 36%. β-tocopherol loss was the highest at 50%; for α-tocopherol it was 41% and for γ-tocopherol it was 36%.


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Armougom PR. 1998. Etude de la fraction lipidique des graines de Cucurbitacées tropicales des genres Lagenaria, Luffa, Momordica. Thèse de docteur es Sciences, Université de la Réunion.

Barrera-Arellano D, Ruiz-Mendez V, Velasco J, Marquez- Ruiz G, Dobarganes C. 2002. Loss of tocopherols and formation of degradation compounds at frying temperatures in oils differing in degree of unsaturation and natural antioxidant content. J. Sci. Food Agric. 82, 1696-1702. doi:10.1002/jsfa.1245

Campbell S, Stone W, Whaley S, Krishnan K. 2003. Development of gamma-tocopherol as a colorectal cancer chemopreventive agent. Crit. Rev. Oncol. Hematol. 47 (3) 249-259. doi:10.1016/S1040-8428(03)00042-8

Cheng SC, Burton GW, Ingold KU, Foster DO. 1987. Chiral discrimination in the exchange of alphatocopherol stereoisomers between plasma and red blood cells. Lipids 22, 469-473. doi:10.1007/BF02540361

Chunhieng T. 2003. Développement de nouveaux neutraceutiques à partir de graines et fruits d’origine tropicale : Application à la Noix du Brésil Bertholletia excelsa et au fruit de Cambodge Morinda Citrifollia. Thèse de Docteur es Sciences, Université de Nancy.

De Leenheer AP, Nelis HJ, Lambert WE, Bauwens RM. 1988. Chromatography of fat-soluble vitamins in clinical chemistry. J. Chromatogr. 429, 3-58. doi:10.1016/S0378-4347(00)83866-9

Dziezak JD. 1986. Preservatives, antioxidants. The ultimate answer to oxidation. Food Technol. 9, 94-102.

Gonzales MJ. 1990. Serum concentrations and cellular uptake of vitamin E. Med. Hypotheses 32, 107-110. doi:10.1016/0306-9877(90)90032-A

Gottstein T, Grosch W. 1990. Model study of different antioxidant properties of alpha- and gammatocopherols in fats. Fett. Wiss. Technol. 92, 139-144. doi:10.1002/lipi.19900920404

Guiraud J. 1998. In “Microbiologie alimentaire – Rappels de microbiologie générale” Ed. Dunod, France. Horwitt MK. 1986. The promotion of vitamin E. J. Nutr. 116, 1371-1377.

Huang HY, Appel LJ. 2003. Supplementation of diets with alpha-tocopherol reduces serum concentrations of gamma- and delta-tocopherol in humans. J. Nutr. 133, 3137-3140.

Ingold KU, Burton GW, Foster DO. 1987. Biokinetics of and discrimination between dietary RRR- and SRRalpha- tocopherols in the male rat. Lipids 22, 163-172. doi:10.1007/BF02537297

Jiang Q, Christen S, Shigenaga MK, Ames BN. 2001. Gamma tocopherol, the major food in the US diet, deserves more attention. Am. J. Clin. Nutr. 74, 714-722.

Kamal-Eldin A, Andersson R. 1997. A multivariate study of the correlation between tocopherol content and fatty acid composition in vegetable oils. J. Am. Oil Chem. Soc. 74, 375-376. doi:10.1007/s11746-997-0093-1

Kamal-Eldin A, Appelquist LA. 1996. The chemistry and antioxidant properties of tocopherols and tocotrienols. Lipids 31, 671-701. doi:10.1007/BF02522884

Kraft I, Stibilj V, Trkov Z. 2002. Iodine and selenium contents in pumpkin (Cucurbita pepo L.) oil and oilcake. Eur. Food Res. Technol. 215, 279-281. doi:10.1007/s00217-002-0563-5

Macklin LJ. 1984. “Vitamin E” En L.J. Machlin (Ed.) Handbook of vitamins: nutritional biochemical and clinical aspects. Marcel Dekker Inc, New York.

Meydani M, Macauley JB, Blumbergn JB. 1986. Influence of dietary vitamin E, selenium age on regional distribution of alpha-tocopherol in the rat brain. Lipids 21, 786-791. doi:10.1007/BF02535413

Murkovic M, Pfannhauser W. 2000. Stability of pumpkin seed oil. Eur. J. Lipid Sci. Technol. 102 (10) 607-611. doi:10.1002/1438-9312(200010)102:10<607::AID-EJLT607>3.0.CO;2-E

Neff WE, Warner K, Ellern F. 2003. Effect of gammatocopherol on formation of non volatile lipid degradation products during frying of potato chips in triolein. JAOCS. 80 (8) 801-806. doi:10.1007/s11746-003-0775-0

Schmidt K, Nikoleit DA. 1993. Vitamine E naturelle, vitamine E synthétique : en quoi diffèrent-elles ? STP Pharma pratiques 3 (4) 259-273.

Shimada Y, Nakai S, Suenaga M, Sugihara A, Kitano M, Tominaga Y. 2000. Facile purification of tocopherols from soybean oil deodorizer distillate in high yield using lipase. JAOCS. 77, 1009-1013. doi:10.1007/s11746-000-0160-z

Tomassi G, Silano V. 1986. An assessment of the safety of tocopherols as food additives. Food Chem. Toxicol. 24, 1051-1061. doi:10.1016/0278-6915(86)90288-7

Ucciani E. 1995. In “Nouveau dictionnaire des huiles végétales”. Tec et Doc Lavoisier, Paris, France. Veris, Anonymous. 1993. “Vitamin E Research Summary”. Veris Inc., June.

Yoshida H, Hirooka N, Kajimoto G. 1991. Microwave heating effects on relative stabilities of tocopherols in oils. JAOCS. 68, 1042-1046.

Yoshida H, Tatsumi M, Kajimoto G. 1992. Influence of fatty acids on tocopherol stability in vegetable oils during microwave heating. JAOCS. 69, 119-125. doi:10.1007/BF02540560

Yoshida H, Takagi S, Mitsuhashi S. 1999. Tocopherol distribution and oxidative stability of oils prepared from the hypocotyl of soybeans roasted in a microwave oven. JAOCS. 76, 915-920. doi:10.1007/s11746-999-0106-3

Younis Y, Ghirmay S, Al-Shihry S. 2000. African Cucurbita pepo; properties of seed and variability in fatty acid composition of seed oil. Phytochemistry 54, 71-75. doi:10.1016/S0031-9422(99)00610-X




How to Cite

François G, Nathalie B, Jean-Pierre V, Daniel P, Didier M. Effect of roasting on tocopherols of gourd seeds (Cucurbita pepo). Grasas aceites [Internet]. 2006Dec.31 [cited 2024Feb.28];57(4):409-14. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/67