Abstract
Jute leaves (Corchorus spp.) have been used as a medicinal plant for the treatment of various diseases. The study was investigated on the antioxidant activities and HPLC profiling of polyphenolic compounds in ethanol extract of Corchorus olitorius (C. olitorius) and Corchorus capsularis (C. capsularis) leaves. The total antioxidant capacity was evaluated by phosphomolybdenum method and Identification and quantification of polyphenolic compounds were performed using HPLC-DAD system. The results indicated that eight polyphenolic compounds were found in the C. capsularis leaves but C. olitorius leaves contain six polyphenolic compounds. In fact, major identified polyphenolic compounds of C. capsularis leaves were caffeic acid (CA), 55.93±0.13; trans-ferulic acid (FA), 58.02±0.18; rutin hydrate (RH), 32.16±0.08; ellagic acid (EA), 53.65±0.11 and quercetin hydrate (QU), 46.17±0.09 mg/100 g of dry extract respectively. Whereas in C. olitorius leaves which were rutin hydrate (RH), 152.17±0.51; ellagic acid (EA), 143.27±0.58 and quercetin hydrate (QU), 292.83±0.73 mg/100 g of dry extract respectively. The results showed that C. capsularis leaves contained high level of total antioxidant capacity (214.32±1.95 mg of ascorbic acid/g of dry extract) than that of C. olitorius (165.66±1.30 mg of ascorbic acid/g of dry extract) leaves. The overall data suggested that C. olitorius and C. capsularis leaves contain a significant amount of several polyphenolic compounds that could be used as a natural antioxidant for functional foods.
Highlights
Jute (Corchorus spp.) is a cash crop in Bangladesh being cultivated in 10% of agricultural land area (Islam, 2019)
The total antioxidant capacity of the C. olitorius and C. capsularis leaves sample extract were evaluated by the phosphomolybdenum assay method (Prieto et al, 1999) which is based on the reduction of Mo (VI) to Mo (V) and the subsequent formation of a green phosphateMo (V) complex in acidic condition. 0.3 mL of each extract (1 mg mL-1) was allowed to mix with 3.0 mL of the reagent solution (0.6 M H2SO4, 28 mM Na3PO4, 4 mM ammonium molybdate)
Results showed that C. capsularis leaves contained high total antioxident capacity (214.32±1.95 mg of ascorbic acid/g of dry extract) C. olitorius (165.66±1.30 mg of ascorbic acid/g of dry extract)
Summary
Jute (Corchorus spp.) is a cash crop in Bangladesh being cultivated in 10% of agricultural land area (Islam, 2019). It is cultivated in many other countries like as India, Myanmar, Nepal, China, Taiwan, Thailand, Vietnam, Cambodia, Brazil, etc. Demand for medicinal plants is increasing in both developed and developing countries due to the growing recognition of natural products being effective, safe, non-narcotic, affordable and has no side effects. One such medicinal plant part is jute leaves (Islam, 2013). In this study, we attempted to investigate the total antioxidant capacity and HPLC profiling of bioactive polyphenolic compounds in 80% ethanol extract of two varieties of jute leaves growing in Bangladesh
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