Comparative Study of Ascorbic Acid and Tocopherol Concentrations in Hydroponic- and Soil-Grown Lettuces
- 1 Agriculture, Nutrition and Veterinary Sciences Department, University of Nevada, Reno, USA.
- 2 Agriculture, Nutrition and Veterinary Sciences Department, University of Nevada, Reno, USA.
Abstract
Hydroponically-grown produce may be a way of helping to feed the world a variety of fruits and vegetables, regardless of soil quality, space availability or climate. The objective of this study was to determine whether hydroponicallygrown lettuce contains as much ascorbic acid and tocopherol as soil-grown lettuce. We analyzed four varieties of lettuce, including: Waldmann’s Dark Green, Red Lollo Antago, Red Romaine Annapolis, and Butterleaf. The tocopherol content of hydroponically-grown Waldmann’s Dark Green, Red Lollo Antago, and Red Romaine Annapolis was 229%, 497% and 492% higher, respectively, compared to their soil-grown counterpart. The ascorbic acid content of hydroponically-grown Waldmann’s Dark Green, Red Lollo Antago, and Red Romaine Annapolis was 93%, 171% and 216% higher, respectively, compared to their soil-grown counterparts. Hydroponically grown lettuce varieties are significantly higher in both ascorbic acid and tocopherol content than their soil-grown counterparts, and hydroponic gardening is a viable option for producing nutritious fruits and vegetables.
- P. M. Kris-Etherton, K. D. Hecker, A. Bonanome, S. M. Coval, A. E. Binkoski, K. F. Hilpert, et al., “Bioactive Compounds in Foods: Their Role in the Prevention of Cardiovascular Disease and Cancer,” American Journal of Medicine, Vol. 113, No. 9, 2002, pp. 71-88. http://dx.doi.org/10.1016/S0002-9343(01)00995-0
- R. Wheeler, “Plants for Human Life Support in Space: From Myers to Mars,” Gravitational and Space Biology, Vol. 23, No. 2, 2010, pp. 25-35.
- G. F. Combs, “The Vitamins: Fundamental Aspects in Nutrition and Health,” Elsevier, Burlington, 2008.
- I. D. Desai and L. J. Machlin, “Vitamin E. Methods in Vitamin Assay,” 4th Edition, John Wiley & Sons WileyInterscience, New York, 1985, pp. 255-283.
- S. T. Omaye, J. D. Turnbull and H. E. Sauberlich, “Selected Methods for the Determination of Ascorbic Acid in Animal Cells, Tissues, and Fluids,” Methods in Enzymology, Vol. 62, 1979, pp. 7-8. http://dx.doi.org/10.1016/0076-6879(79)62181-X
- C. Sgherri, S. Cecconami, C. Pinzino, F. Navari-Izzo and R. Izzo, “Levels of Antioxidants and Nutraceuticals in Basil Grown in Hydroponics and Soil,” Food Chemistry, Vol. 123, No. 2, 2010, pp. 416-422. http://dx.doi.org/10.1016/j.foodchem.2010.04.058
- S. Nicola, J. Hoeberechts and E. Fontana, “Comparison between Traditional and Soilless Culture Systems to Produce Rocket (Eruca sativa) with Low Nitrate Content,” Acta Horticulturae, Vol. 697, 2005, pp. 549-555.
- M. V. Selma, M. C. Luna, A. Martínez-Sánchez, J. A. Tudela, D. Beltrán, C. Baixauli and M. I. Gil, “Sensory Quality, Bioactive Constituents and Microbiological Quality of Green and Red Fresh-Cut Lettuces (Lactuca sativa L.) Are Influenced by Soil and Soilless Agricultural Production Systems,” Postharvest Biology and Technology, Vol. 63, No. 1, 2012, pp. 16-24. http://dx.doi.org/10.1016/j.postharvbio.2011.08.002
- R. Szymańska and J. Kruk, “Tocopherol Content and Isomers’ Composition in Selected Plant Species,” Plant Physiology and Biochemistry, Vol. 46, No. 1, 2008, pp. 29-33. http://dx.doi.org/10.1016/j.plaphy.2007.10.009
- O. Kenny and D. O’Beirne, “The Effects of Washing Treatment on Antioxidant Retention in Ready-To-Use Iceberg Lettuce,” International Journal of Food Science and Technology, Vol. 44, No. 6, 2009, pp. 1146-1156. http://dx.doi.org/10.1111/j.1365-2621.2009.01935.x
- S. K. Lee and A. A. Kader, “Preharvest and Postharvest Factors Influencing Vitamin C Content of Horticultural Crops,” Postharvest Biology and Technology, Vol. 20, No. 3, 2000, pp. 207-220. http://dx.doi.org/10.1016/S0925-5214(00)00133-2