Isolation and characterization of ellagitannins as the major polyphenolic components of Longan (Dimocarpus longan Lour) seeds

Antioxidant activities of fractions from longan pericarps

“…Gongming Zheng et al (2009) isolated and further characterized eight polyphenols from longan seeds and determined the eight polyphenols exhibited scavenging activity towards DPPH radicals with SC 50 values of 0.80-5.91 μg/mL and towards superoxide radicals with SC 50 values of 1.04-7.03 μg/L. Yuttana Sudjaroen et al (2012) also pointed out that purified antioxidants from this source may prove useful not only for increasing the shelf life of foods by preventing lipid peroxidation but also for protecting against oxidative damage in living systems by scavenging reactive oxygen radicals. Therefore, longan pericarp can be good candidate sources for natural antioxidant.…”

“…The EC 50 values of LPEF and LPDF were 0.253 and 0.260 mg/mL, while LPBF and LPCE were 0.407 and 0.498 mg/mL (Table 1). Yingming Pan et al (2008) revealed the reducing power of Soxhlet extract of longan peel was lower (the absorbance at 700 nm was 1.439 at 1.0 mg/mL) (Sudjaroen et al, 2012).…”

Determination of Major Polyphenolic Components in Euphoria longana Lam. by Validated High Performance Thin-Layer Chromatography Method and Direct Analysis in Real Time Mass Spectrometry

“…Also, previous reports have confirmed the presence of epicatechin ( Figure 1) in E. longana seeds as other major phenolic compound [3,4]. As E. longana seeds contain significant amounts of polyphenolic compounds, seed extract exhibits excellent antioxidant [1,[4][5][6][7], anti-tyrosinase [1], antifungal [8], anti-inflammatory [9], antigelatinase, anti-angiogenesis, and anticancer [2,10,11] activities. Also, E. longana seed extract has been investigated concerning its beneficial effects on learning and memory impairment in mice [12].…”

“…Also, E. longana seed extract has been investigated concerning its beneficial effects on learning and memory impairment in mice [12]. As a matter of fact, these polyphenolic compounds are usually considered as the markers for quality control of E. longana [3,4,13]. Therefore, for the purpose, a suitable and preferred method for analysis of these polyphenolic compounds is necessary.…”

“…So far, a few methods such as high performance liquid chromatography (HPLC) [1,3,4,6] have been developed for the determination of polyphenolic compounds in E. longana. These liquid chromatography methods reported for quantification of only either two or three major polyphenolic compounds.…”