BACKGROUND & AIMS:
:The elemental/centesimal composition of dried fruits and capsules containing Goji berries (Lycium barbarum L.) was evaluated by ICP OES after two digestion procedures. Furthermore, phenolic acid compounds and flavonoids were quantified by HPLC-UV-DAD. Precision, accuracy, LOD and LOQ were evaluated. The samples showed similar contents of proteins, lipids and carbohydrates. The metal contents in the samples were found at different levels (minimum-maximum, in mg kg-1), as follows: Ca (181.1-200.2); Cu (1.703-2.145); Fe (7.420-7.852); K (81.78-83.59); Mg (92.58-95.12); Mn (1.630-2.570); Na (587.9-590.7); P (3.124-3.360); Se (2.812-3.345); V (0.055-0.062) and Zn (2.325-2.610). Al, As, Ba Cd, Co, Ni, P, Pb, Sb, Sn and Sr showed values below the LOD. Accuracy was assessed by analysis of tomato leaves (NIST 1573a). Eight bioactive phenolic compounds (caffeic, chlorogenic, ellagic, ferulic, gallic, p-coumaric, syringic and vanillic acids) and two flavonoids [(+)-catequin and rutin] were determined, in levels of 55.5-83.700 and 172.3-2982.4 mg kg-1, respectively.
背景与目标:
: 经过两次消化程序,通过ICP OES评估了含有枸杞 (枸杞) 的干果和胶囊的元素/百分数组成。此外,酚酸化合物和类黄酮通过hplc-uv-dad进行定量。评估了精度、准确性、LOD和LOQ。样品显示出相似的蛋白质,脂质和碳水化合物含量。样品中的金属含量不同 (最小-最大,单位为mg kg-1),如下所示: Ca (181.1-200.2); Cu (1.703-2.145); Fe (7.420-7.852); K (81.78-83.59); mg (92.58-95.12); Mn (1.630-2.570); Na (587.9-590.7); P (3.124-3.360); Se (2.812-3.345); V (0.055-0.062) 和Zn (2.325-2.610)。Al,As,Ba Cd,Co,Ni,P,Pb,Sb,Sn和Sr的值低于LOD。通过番茄叶片分析 (NIST 1573a) 评估准确性。测定了八种生物活性酚类化合物 (咖啡酸,绿原酸,鞣花酸,阿魏酸,没食子酸,对香豆酸,丁香酸和香草酸) 和两种类黄酮 [()-儿茶素和芦丁],分别为55.5-83.700和172.3-2982.4 mg kg-1。