Physical and chemical characteristics of golden-yellow and purple-red varieties of tamarillo fruit (Solanum betaceum Cav.).
Golden-yellow and purple-red tamarillos (Solanum betaceum Cav.) cultivated in Ecuador were studied for their physical properties, proximate composition, pH, degrees Brix, acidity, sugars, organic acids, minerals, vitamin C and beta-carotene content in the edible part. Results were compared with those for Spanish fruits. The golden-yellow and purple-red Ecuadorian fruits were larger (107 and 188 g) than the respective Spanish fruits (43 and 63 g), softer but generally similar in chemical composition except for fat (0.72 and 0.6%) and malic acid (0.32 and 0.53%) contents in the golden-yellow and purple-red Ecuadorian fruits. Tamarillo fruits are a good source of potassium (approximately 400 mg/100 g fresh weight). Total phenolics in the golden-yellow and purple-red varieties were 125 and 187 mg gallic acid equivalents/100 g fresh weight, respectively. The golden-yellow variety had weaker anti-DPPH radical activity than the purple-red variety. Flavonols were only found in the peel of both varieties, while hydroxycinnamic acid derivatives were found in peel and pulp.
Vasco
Catalina
C
Department of Food Science, Swedish University of Agricultural Sciences, Uppsala, Sweden. Catalina.Vasco@lmv.slu.se
Avila
Jenny
J
Ruales
Jenny
J
Svanberg
Ulf
U
Kamal-Eldin
Afaf
A
D001205:Ascorbic Acid / Q000032:analysis; D002136:Calcium, Dietary / Q000032:analysis; D002264:Carboxylic Acids / Q000032:analysis; D055598:Chemical Phenomena; D003373:Coumaric Acids / Q000032:analysis; D004040:Dietary Carbohydrates / Q000032:analysis; D004484:Ecuador; D044948:Flavonols / Q000032:analysis; D016166:Free Radical Scavengers / Q000032:analysis; D005638:Fruit / Q000737:chemistry* / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D009929:Organ Size; D009928:Organ Specificity; D010636:Phenols / Q000032:analysis; D010858:Pigmentation; D017419:Potassium, Dietary / Q000032:analysis; D032322:Solanum / Q000737:chemistry*; D013045:Species Specificity; D014131:Trace Elements / Q000032:analysis; D019207:beta Carotene / Q000032:analysis
D002136:Calcium, Dietary; D002264:Carboxylic Acids; D003373:Coumaric Acids; D004040:Dietary Carbohydrates; D044948:Flavonols; D016166:Free Radical Scavengers; D010636:Phenols; D017419:Potassium, Dietary; D014131:Trace Elements; D019207:beta Carotene; D001205:Ascorbic Acid