title: Optimisation of pressurised liquid extraction of antioxidants from black bamboo leaves.
abstract: To develop an efficient green extraction approach for recovering bioactive compounds from natural plants, the potential of using pressurised liquid extraction (PLE) was examined on black bamboo (Phyllostachys nigra) leaves, with ethanol/water as solvents. The superheated PLE process showed a higher recovery of most constituents and antioxidative activity, compared to reflux extraction, with a significantly improved recovery of the total phenolic (TP) and flavonoid (TF) content and DPPH radical scavenging ability. For a broad range of ethanol aqueous solutions and temperatures, 50% EtOH and 200°C (static time: 25min) gave the best performance, in terms of the TP and TF (75% EtOH) content yield and DPPH scavenging ability (25% EtOH). Under the optimised extraction conditions, eight main antioxidative compounds were isolated and identified with HPLC-ABTS(+) assay guidance and assessed for radical scavenging activity. The superheated extraction process for black bamboo leaves enhanced the antioxidant properties by increasing the extraction of the phenolic components.
authors: Functional Food Center, KIST Gangneung Institute, Gangwon 210-340, Republic of Korea; Major of Biological Chemistry, University of Science and Technology, Daejeon 305-350, Republic of Korea. Electronic address: yafangshang@yahoo.com.
authors: Ya Fang
authors: YF
authors: Shang
authors: Functional Food Center, KIST Gangneung Institute, Gangwon 210-340, Republic of Korea. Electronic address: bluewd2@hanmail.net.
authors: Sang Min
authors: SM
authors: Kim
authors: Functional Food Center, KIST Gangneung Institute, Gangwon 210-340, Republic of Korea. Electronic address: albertum@kist.re.kr.
authors: Byung-Hun
authors: BH
authors: Um
mesh_terms: D000975:Antioxidants / Q000032:analysis / Q000302:isolation & purification*; D005591:Chemical Fractionation / Q000295:instrumentation / Q000379:methods*; D010936:Plant Extracts / Q000032:analysis / Q000302:isolation & purification*; D006109:Poaceae / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts
keywords: Antioxidants; Phyllostachys nigra; Superheated process; Total flavonoid; Total phenolic