TOTAL PHENOLIC, TOTAL FLAVONOID CONTENTS AND RADICAL SCAVENGING ACTIVITIES OF 10 ARABIAN HERBS AND SPICES

The current study attempted to investigate the antioxidant activities of 10 Arabian herbs and spices namely, A. obesum flower, T.
foenum-graecum leaves, S. officinalis leaves, Z. piperitum seeds, A.vera gel, I. verum seeds, A. corrorima fruits, N. sativa seeds,
L.sativum seeds, and Z. spina-christi leaves by determining their total phenolic, total flavonoid and Trolox equivalent antioxidant
capacity. The mean values of the total phenolic content were 1889.66, 789.63, 235.33, 1264.85, 5477.53, 693, 62.37, 166.05, 602.25,
and 938.27 (mg GAE/100g) in A. obesum , T. foenum-graecum, S. officinalis, Z. piperitum , A. vera , I. verum , A. corrorima, N.
sativa, L. sativum, and Z. spinachristi respectively, whereas the mean values of the total flavonoid content were 553.52 , 598.82,
178.67, 434.4, 1958.27, 112.13, 4.33, 36.87, 61.85, and 249.56 ( mg QEA / 100g ) respectively. The mean values of Trolox equivalent
antioxidant capacity (TEAC) were 6328.51, 1273.2, 579.07, 4357.45, 11642.56, 1842.38 , 158.77, 511.15 , 910.22 , 3293.33 (µmole
/100 g) in A. obesum, T. foenum-graecum, S. officinalis, Z. piperitum , A. vera, I. verum , A. corrorima, N. sativa , L. sativum, and Z.
spina-christi, respectively. Our findings showed that A. vera gel and A. obesum have a high total phenolic content, also the two plants
possess a considerable content of total flavonoid and they also have a high levels of TEAC radical-scavenging activity compared with
the current studied plants. It will be useful to further analyze A. vera gel and A. obesum flower in order to separate and identify their
possible protective roles against diabetes mellitus and hyperlipidemia.