Soilless (hydroponic) vegetables and fruits grown in greenhouses are gaining popularity and potentially represent a compliment toward sustainable food sources. Only a few studies have looked at the nutrient quality of strawberries ( Fragaria × ananassa ) and raspberries ( Rubus idaeus ) grown in soilless systems. Dry weights, content of ascorbic acid, tocopherol, total polyphenolic compounds, glucose, fructose, and soluble solids (BRIX) of strawberries and raspberries grown in soilless systems were compared to their counterpart grown in soil. There was no change in dry weights but BRIX values (28% - 31%), glucose (158% - 175%), and fructose (75% - 102%) content for strawberries and raspberries respectively were significantly higher for the soil grown berries compared to soilless grown berries. Contents of ascorbic acid, tocopherol and total polyphenolic compounds were significantly higher in soilless grown strawberries compared to soil grown strawberries by 74%, 53%, and 22% respectively, and contents of ascorbic acid and total polyphenolic compounds were significantly higher in soil grown raspberries by 83% and 67% respectively compared to soilless grown raspberries. Soilless grown produce warrants future research to strive toward the potential to provide nutrient dense crops and opportunities toward optimized sustainable production.
Steinmetz, K.A. and Potter, J.D. (1996) Vegetables, Fruit, and Cancer Prevention: A Review. Journal of the American Dietetic Association, 96, 1027-1039. http://dx.doi.org/10.1016/S0002-8223(96)00273-8
Blasa, M., Gennari, L., Angelino, D. and Ninfali, P. (2010) Fruit and Vegetable Antioxidants in Health. In: Bioactive Foods in Promoting Health: Fruits and Vegetables, Academic Press, San Diego, 37-58. http://dx.doi.org/10.1016/b978-0-12-374628-3.00003-7
Resh, H.M. and Howard, M. (2002) Hydroponic Food Production: A Definitive Guidebook for the Advanced Home Gardener and the Commercial Hydroponic Grower. EUA, St. Bárbara.
Glanz, K., Basil, M., Maibach, E., Goldberg, J. and Snyder, D. (1998) Why Americans Eat What They Do: Taste, Nutrition, Cost, Convenience, and Weight Control Concerns as Influences on Food Consumption. Journal of the American Dietetic Association, 98, 1118-1126. http://dx.doi.org/10.1016/S0002-8223(98)00260-0
Buchanan, D.N. and Omaye, S.T. (2013) Comparative Study of Ascorbic Acid and Tocopherol Concentrations in Hydroponic- and Soil-Grown Lettuces. Food and Nutrition Sciences, 4, 1047-1053. http://dx.doi.org/10.4236/fns.2013.410136
Palermo, M., Paradiso, R., De Pascale, S. and Fogliano, V. (2012) Hydroponic Cultivation Improves the Nutritional Quality of Soybean and Its Products. Journal of Agricultural and Food Chemistry, 60, 250-255. http://dx.doi.org/10.1021/jf203275m
Premuzic, Z., Bargiela, M., Garcia, A., Rendina, A. and Iorio, A. (1998) Calcium, Iron, Potassium, Phosphorus, and Vitamin C Content of Organic and Hydroponic Tomatoes. HortScience, 33, 255-257.
Kiferle, C., Lucchesini, M., Mensuali-Sodi, A., Maggini, R., Raffaelli, A. and Pardossi1, A. (2011) Rosmarinic Acid Content in Basil Plants Grown in Vitro and in Hydroponics. Central European Journal of Biology, 6, 946-957. http://dx.doi.org/10.2478/s11535-011-0057-1
Kimura, M. and Rodriguez-Amaya, D.B. (2003) Carotenoid Composition of Hydroponic Leafy Vegetables. Journal of Agricultural and Food Chemistry, 51, 2603-2607. http://dx.doi.org/10.1021/jf020539b
Selma, M.V., Luna, M.C., Martínez-Sánchez, A., Tudela, J.A., Beltrán, D., Baixauli, C. and Gil, M.I. (2012) 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, 63, 16-24. http://dx.doi.org/10.1016/j.postharvbio.2011.08.002
Gruda, N. (2005) Impact of Environmental Factors on Product Quality of Greenhouse Vegetables for Fresh Consumption. Critical Reviews in Plant Sciences, 24, 227-247.
Brestic, M. and Zivcak, M. (2013) PSII Fluorescence Techniques for Measurement of Drought and High Temperature Stress Signal in Crop Plants: Protocols and Applications. In: Rout, G.R. and Das Bandhu, A., Eds., Molecular Stress Physiology of Plants, Springer India, New Delhi, 87-131. http://dx.doi.org/10.1007/978-81-322-0807-5
Gruda, N. (2009) Do Soilless Culture Systems Have an Influence on Product Quality of Vegetables ? Journal of Applied Botany and Food Quality, 82, 141-147.
Meyers, K.J., Watkins, C.B., Pritts, M.P. and Liu, R.H. (2003) Antioxidant and Antiproliferative Activities of Strawberries. Journal of Agricultural and Food Chemistry, 51, 6887-6892. http://dx.doi.org/10.1021/jf034506n
Hannum, S.M. (2004) Potential Impact of Strawberries on Human Health: A Review of the Science. Critical Reviews in Food Science and Nutrition, 44, 1-17. http://dx.doi.org/10.1080/10408690490263756
Liu, M., Li, X.Q., Weber, C., Lee, C.Y., Brown, J. and Liu, R.H. (2002) Antioxidant and Antiproliferative Activities of Raspberries. Journal of Agricultural and Food Chemistry, 50, 2926-2930. http://dx.doi.org/10.1021/jf0111209
Combs, G.F. (2008) The Vitamins: Fundamental Aspects in Nutrition and Health. Elsevier B.V., Burlington.
Zhang, Y., Seeram, N.P., Lee, R., Feng, L. and Heber, D. (2008) Isolation and Identification of Strawberry Phenolics with Antioxidant and Human Cancer Cell Antiproliferative Properties. Journal of Agricultural and Food Chemistry, 56, 670-675. http://dx.doi.org/10.1021/jf071989c
US Department of Agriculture, Agricultural Research Service (2011) USDA National Nutrient Database for Standard Reference, Release 24.
Crisosto, C.H., Crisosto, G. and Neri, F. (2006) Understanding Tree Fruit Quality Based on Consumer Acceptance. Acta Horticulturae, 712, 183-189.
Zude, M., Herold, B., Roger, J.M., Bellon-Maurel, V. and Landahl, S. (2006) Non-Destructive Tests on the Prediction of Apple Fruit Flesh Firmness and Soluble Solids Content on Tree and in Shelf Life. Journal of Food Engineering, 77, 254-260. http://dx.doi.org/10.1016/j.jfoodeng.2005.06.027
USDA (2013) Technical Procedures Manual.
AOAC (1998) Official Methods of Analysis of AOAC International. Association of Official Analytical Chemists International, CD-ROM.
Omaye, S.T., Turnbull, J.D. and Sauberlich, H.E. (1979) Selected Methods for the Determination of Ascorbic Acid in Animal Cells, Tissues, and Fluids. Methods in Enzymology, 62, 3-11. http://dx.doi.org/10.1016/0076-6879(79)62181-x
Duygu Ozsoy, H. and Van Leeuwen, J. (2010) Removal of Color from Fruit Candy Waste by Activated Carbon Adsorption. Journal of Food Engineering, 101, 106-112. http://dx.doi.org/10.1016/j.jfoodeng.2010.06.018
Kahn, M.M., Rahman, M.M., Islam, S. and Begum, S. (2006) A Simple UV-Spectrophotometric Method for the Determination of Vitamin C Content in Various Fruits and Vegetables at Sylhet Area in Bangladesh. Journal of Biological Sciences, 6, 388-392. http://dx.doi.org/10.3923/jbs.2006.388.392
Fabianek, J., Apak, E., Gunaydi, E. and Sogen, K. (1968) Micromethod for Tocopherol Determination in Blood Serum. Clinical Chemistry, 14, 456-462.
Heinonen, I., Lehtonen, P. and Hopia, A. (1998) Antioxidant Activity of Berry and Fruit Wines and Liquors. Journal of Agricultural and Food Chemistry, 46, 25-31. http://dx.doi.org/10.1021/jf970489o
Marinova, D., Ribarova, F. and Atanassova, M. (2005) Total Phenolics and Total Flavonoids in Bulgarian Fruits and Vegetables. Journal of Chemical Technology and Metallurgy, 40, 255-260.
Taylor, K.A.C.C. (1995) A Colorimetric Fructose Assay. Applied Biochemistry and Biotechnology, 53, 215-227. http://dx.doi.org/10.1007/BF02783497
Miller, G.L. (1959) Use of Dinitrosalicyclic Reagent for Determination of Reducing Sugar. Analytical Chemistry, 31, 426-428. http://dx.doi.org/10.1021/ac60147a030
Sgherri, C., Cecconami, S., Pinzino, C., Navari-Izzo, F. and Izzo, R. (2010) Levels of Antioxidants and Nutraceuticals in Basil Grown in Hydroponics and Soil. Food Chemistry, 123, 416-422. http://dx.doi.org/10.1016/j.foodchem.2010.04.058
Premuzic, Z., Bargiela, M., Garcia, A., Rendina, A. and Iorio, A. (1998) Calcium, Iron, Potassium, Phosphorus, and Vitamin C Content of Organic and Hydroponic Tomatoes. HortScience, 33, 255-257.
Elia, A., Santamaria, P. and Serio, F. (1998) Nitrogen Nutrition, Yield and Quality of Spinach. Journal of the Science of Food and Agriculture, 76, 341-346.
Konstantopoulou, E., Kapotis, G., Salachas, G., Petropoulos, S.A., Karapanos, I.C. and Passam, H.C. (2010) Nutritional Quality of Greenhouse Lettuce at Harvest and after Storage in Relation to N Application and Cultivation Season. Scientia Horticulturae, 125, 93.e1-93.e5. http://dx.doi.org/10.1016/j.scienta.2010.03.003
Zhang, Y. (2005) Effects of Nitrogen Supply on Nutritional Quality and Antioxidative Enzyme Activities of Spinach. Chinese Journal of Applied Ecology, 16, 519-523.
Randle, W.M. (2000) Increasing Nitrogen Concentration in Hydroponic Solutions Affects Onion Flavor and Bulb Quality. Journal of the American Society for Horticultural Science, 125, 254-259.
Sun, Y.D., Luo, W.R. and Liu, H.C. (2014) Effects of Different Nitrogen Forms on the Nutritional Quality and Physiological Characteristics of Chinese Chive Seedlings. Plant, Soil and Environment, 60, 216-220.
Gichuhi, P.N., Mortley, D., Bromfield, E. and Bovell-Benjamin, A.C. (2009) Nutritional, Physical, and Sensory Evaluation of Hydroponic Carrots (Daucus carota L.) from Different Nutrient Delivery Systems. Journal of Food Science, 74, S403-S412. http://dx.doi.org/10.1111/j.1750-3841.2009.01338.x