title: The adsorption of lead(II) ions by dynamic high pressure micro-fluidization treated insoluble soybean dietary fiber.
abstract: Insoluble dietary fiber from soybean residue (SIDF) was treated with dynamic high-pressure microfluidization (DHPM) and used as adsorbent for Pb(II) ion. The effects of pressure on the Pb(II) adsorption capacity, primary cilia structure and surface topography of SIDF were determined using a gastrointestinal simulated model in vitro. SIDF (at pH 7.0) showed maximum binding capacity (261.42 ± 2.77 μmol/g), which was about 1.13 times higher than that of untreated sample (233.47 ± 1.84 μmol/g), when pressure reached 80 MPa. However, the net adsorption value of SIDF in a simulated small intestine (~ 9 μmol/g) was significantly lower than that in the stomach (~ 48 μmol/g), because of the competitive adsorption of Pb(2+) by pancreatin, cholate and several enzymes in the small intestine. In addition, the adsorption capacity of SIDF exhibited good linear relationship with the physicochemical properties of total negative charges, and the adsorption behavior presumably occurred on the surface area of granules fiber.
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047 China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047 China.
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047 China ; Jiangxi Normal University, Nanchang, Jiangxi 330022 China.
authors.forename: Zong-Cai
authors.initials: ZC
authors.lastname: Tu
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047 China.
authors.forename: Chuan-Ying
authors.initials: CY
authors.lastname: Ruan
authors.affiliation: College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014 People's Republic of China.
authors.forename: Derong
authors.initials: D
authors.lastname: Lin
keywords: Dynamic high pressure microfluidization; Insoluble dietary fiber; Pb; Soybean residue