Isolation and composition of chromoplasts from tomatoes.
The fruit of the tomato plant is composed of elongated tomato cells filled with organelles called chromoplasts (plastids). These plastids scattered throughout the cell are rich in nutrients, particularly protein (33%) and lipids (20%). They can be released from the cells by rupture of their cell membranes and then isolated. Plastids and their cell contents can be utilized by the food-processing industry for the preparation of special food products. This study was designed to examine the macronutrient content of isolated tomato plastids and, therefore, determine its potential nutritional value. Use of tomato plastids in pasta sauces and rice dishes, salsa, and extrusion products would increase the nutritional value of the product. Because glucose has been removed in the process of plastid isolation, tomato plastids are useful in the diets of diabetics and cardiovascular patients, as well as for patients in need of weight reduction. Composition comparison of tomato plastid is made with tomato paste, from which glucose has not been removed. Many people require low-sugar products for medical reasons (diabetics and those with cardiovascular disease) and others for weight loss. Therefore, tomato chromoplasts having high protein and lipid contents and low sugar content may be useful in meeting these particular human needs.
Hansen
Linn U
LU
Western Regional Research Center, U.S. Department of Agriculture, 800 Buchanan Street, Berkeley, California 94710-1105, USA. luh@pw.usda.gov
Chiu
Mei-Chen M
MC
D000596:Amino Acids / Q000032:analysis; D002458:Cell Fractionation / Q000379:methods; D004043:Dietary Fiber / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D005638:Fruit / Q000648:ultrastructure*; D018551:Solanum lycopersicum / Q000648:ultrastructure*; D010940:Plant Proteins / Q000032:analysis; D018087:Plastids / Q000737:chemistry* / Q000648:ultrastructure*
D000596:Amino Acids; D004043:Dietary Fiber; D005227:Fatty Acids; D010940:Plant Proteins