Jacques Rosângela A, Arruda Eduardo J, de Oliveira Lincoln C S, de Oliveira Ana P, Dariva Cláudio, de Oliveira J Vladimir, Caramão Elina B
Universidade Federal do Pampa (UFPel/UNIPAMPA), RS, Brazil.
J Agric Food Chem. 2007 Sep 5;55(18):7510-6. doi: 10.1021/jf071545g. Epub 2007 Aug 15.
The influence of agronomic variables (light intensity, age of leaves, and fertilization type) on the content of macronutrients and micronutrients (potassium, calcium, sodium, magnesium, manganese, iron, zinc, and copper) of tea leaves was assessed by acid digestion, followed by flame atomic absorption spectrometry (FAAS). The thermal behavior of mate tea leaves (Ilex paraguariensis) was also studied in this work. Samples of mate (Ilex paraguariensis) were collected in an experiment conducted under agronomic control at Erva-Mate Barão Commerce and Industry LTD (Brazil). The results showed that the mineral content in mate is affected by the agronomic variables investigated. In general, the content of mineral compounds analyzed is higher for younger leaves and for plants cultivated in shadow. Thermal analysis of samples indicated a similar behavior, with three typical steps of decomposition: loss of water, degradation of low-molecular weight compounds, and degradation of residual materials.
通过酸消解，随后采用火焰原子吸收光谱法（FAAS），评估了农艺变量（光照强度、叶片年龄和施肥类型）对茶叶中大量营养素和微量营养素（钾、钙、钠、镁、锰、铁、锌和铜）含量的影响。在这项工作中还研究了马黛茶叶（巴拉圭冬青）的热行为。马黛茶（巴拉圭冬青）样本是在巴西埃尔瓦 - 马黛巴拉奥商业和工业有限公司进行的农艺控制实验中采集的。结果表明，马黛茶中的矿物质含量受所研究的农艺变量影响。一般来说，分析的矿物化合物含量在较年轻的叶片以及在阴凉处种植的植物中更高。样品的热分析表明有类似的行为，具有三个典型的分解步骤：水分损失、低分子量化合物降解和残余物质降解。
