Rodríguez Galdón Beatriz, Tascón Rodríguez Catalina, Rodríguez Rodríguez Elena, Díaz Romero Carlos
Department of Analytical Chemistry, Food Science and Nutrition, University of La Laguna, Avda. Astrofísico Francisco Sánchez s/n, 38201, La Laguna, Santa Cruz de Tenerife, Spain.
J Agric Food Chem. 2008 Aug 13;56(15):6512-9. doi: 10.1021/jf800282h. Epub 2008 Jul 11.
The following organic acids (glutamic, oxalic, pyruvic, malic, tartaric, citric, and fumaric), pungency, Brix degree, acidity, and pH were determined in onion cultivars (Texas, Guayonje, San Juan de la Rambla, Carrizal Alto, Carrizal Bajo, and Masca) harvested in the same agroclimatic conditions. Glutamic acid was the most abundant organic acid (325 +/- 133 mg/100 g) followed by citric acid (48.5 +/- 24.1 mg/100 g) and malic acid (43.6 +/- 10.4 mg/100 g). There were significant differences between the onion cultivars in the mean concentrations of all of the analyzed parameters. The San Juan de la Rambla and Masca cultivars presented, in general, higher concentrations of the organic acids than the other cultivars. Significant differences in most of the analyzed parameters were observed between the two seed origins for the Masca and San Juan de la Rambla cultivars. The onion samples tended to be classified according to the cultivar and, in the case of San Juan de la Rambla cultivar, according to the precedence of the seeds after applying discriminant analysis.
在相同农业气候条件下收获的洋葱品种（得克萨斯、瓜约涅、圣胡安德拉兰布拉、卡里萨尔阿尔托、卡里萨尔巴霍和马斯卡）中，测定了以下有机酸（谷氨酸、草酸、丙酮酸、苹果酸、酒石酸、柠檬酸和富马酸）、辛辣度、糖度、酸度和pH值。谷氨酸是含量最丰富的有机酸（325±133毫克/100克），其次是柠檬酸（48.5±24.1毫克/100克）和苹果酸（43.6±10.4毫克/100克）。所有分析参数的平均浓度在洋葱品种之间存在显著差异。圣胡安德拉兰布拉和马斯卡品种的有机酸浓度总体上高于其他品种。对于马斯卡和圣胡安德拉兰布拉品种，两个种子来源在大多数分析参数上存在显著差异。在应用判别分析后，洋葱样本倾向于根据品种进行分类，对于圣胡安德拉兰布拉品种，则根据种子来源进行分类。
