Antioxidant and selected chemical properties of the flowers of three different varieties of Butterfly Pea (<i>Clitoria ternatea</i> L.)

Abstract

Butterfly pea (Clitoria ternatea L.) is used for production of herbal teas, herbal juices and having a potential to use in culinary purposes. Even though, it is grown widely in Sri Lanka, comprehensive information and studies conducted on three popular varieties are still lacking. Hence, the aim of this study was to evaluate the elemental compositions, phytochemical properties of three C. ternatea L. flower varieties grown in Sri Lanka; white flower with normal keel petals (WSPF), blue flower with normal keel petals (BSPF), and blue flower with enlarged keel petals (BMPF). Total phenolic content (TPC), total flavonoid content (TFC), ferric reducing antioxidant power (FRAP) and DPPH radical scavenging activity in aqueous extracts of C. ternatea flowers were determined using spectrophotometric methods. Kjeldahl method was used to determine the nitrogen content and crude protein % was calculated by multiplying the nitrogen content by a standard factor. Phosphorus content (UV spectrophotometer) and calcium and potassium contents (flame photometer) of the flower samples were measured by using a general mineralization procedure.The maximum TPC and highest level of TFC were reported in BMPF (31.88 mg GAE eq./g dry weight and 15.96 mg quercetin eq./g dry weight of flower) whereas FRAP of WSPF was significantly lower (10.66 mg trol eq./g dry weight of flower). FRAP of BSPF (14.56 mg trol eq./g dry weight of flower) and BMPF (18.50 mg trol eq./g dry weight of flower) were not significantly statistically different. BSPF showed significantly highest level of DPPH radical scavenging activity that was 11.97 mg trol. eq./g dry weight of flower. Meanwhile, the DPPH radical scavenging activity of BMPF and WSPF were not significantly different to each other. Mean P content was highest in WSPF and was lowest in BMPF (4.65 and 4.19 mg/g respectively). The N content was significantly higher (p<0.05) in both BSPF and WSPF (43.12 mg/g and 42.35 mg/g respectively). Significantly higher (p<0.05) mean protein contents were detected for BSPF and it was 26.95%. This is the first such detailed report on chemical composition and antioxidant properties of three main C. ternatea flower varieties grown in Sri Lanka.

Butterfly Pea Flower as a Novel Ingredient to Produce Antioxidant-Enriched Yellow Pea-Based Breakfast Cereals

“…The TPC content of raw YP was 3.0 ± 0.1 mg GAE/g (db) which is in line with the previously reported range (2.2–9.1 mg GAE/g) for split and whole yellow peas of different particle sizes [ 33 ]. As expected, the raw BP contained a much higher amount of TPC than YP with a value of 49.2 ± 0.8 mg GAE/g (db), again in agreement with the TPC range reported for BP in the literature [ 34 , 35 ]. It has also been reported that the TPC content of the raw BP greatly depends on variety [ 35 ], extraction solvent used, e.g., water or methanol [ 36 ], and extraction method, e.g., ultrasound or water bath [ 34 ].…”

Studi Literatur Aktivitas Antioksidan Senyawa Antosianin dalam Ekstrak Bunga Telang (Clitoria ternatea L.) serta Aktivitas Farmakologinya terhadap Penyakit Diabetes Melitus

“…Faktor lain yang dapat mempengaruhi aktivitas antioksidan ekstrak bunga telang (Clitoria ternatea L.) adalah perbedaan varietas tanaman telang yang digunakan yang dapat menghasilkan aktivitas antioksidan yang juga berbeda. Dalam penelitian (11), dilakukan pengujian aktivitas antioksidan terhadap 3 varietas bunga telang (Clitoria ternatea L.) yaitu pada bunga putih kelopak normal, bunga biru kelopak normal, dan bunga biru kelopak yang membesar dengan nilai IC 50 berturut-turut sebesar 27,38 ppm; 51,92 ppm; dan 23,75 ppm. Berdasarkan hasil penelusuran pustaka, dapat diketahui aktivitas paling tinggi dihasilkan oleh bunga telang (Clitoria ternatea L.) berwarna biru dengan kelopak yang membesar yang ditunjukkan oleh nilai IC 50 sebesar 23,75 ppm.…”