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Beijing, China

Li Y.,University of South China | Xiong M.,University of South China | Yin C.,Metrohm China Ltd. | Wu F.,University of South China | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to improve the physiological functions of dietary fiber from sweet potato residue, insoluble dietary fiber (IDF) was prepared from sweet potato residue for physical and chemical properties ultra-high pressure modification with uniform test method. And insoluble dietary fiber was characterised by the methods of SEM, HPCE, FT-IR, XRD, BET and particle size. The conclusion shows that the pressure (X 1), processing time (X 2) and temperature (X 3) had the significant influences on glucose regulation, blood fat regulation and the ability of removing exogenous harmful substances in modified IDF. The optimum processing conditions were that the glucose regulation and blood fat regulation capacity were pressure of 600 MPa, processing time of 15 min and temperature of 60°C; The ability of removing exogenous harmful substances were pressure of 100 MPa, processing time of 10 min and temperature of 42°C. The physicochemical property shows that the microstructure of sweet potato residue IDF modified by the ultra-high pressure was loose, smooth, porous with honeycomb-shaped and massive structure. Either modification didn't affect the monosaccharide compositions, but the contents of monosaccharide changed a little. Meanwhile, crystal and particle size of modified IDF reduced, the specific surface area increased. The characteristic absorption peaks enhanced and a red shift or blue shift appeared, and a number of new absorption peaks occured. The research can provide a reference for functional modifications and utilization of dietary fiber from sweet potato residue.

Wang Z.-H.,Qingdao University | Xia J.-F.,Qingdao University | Zhao F.-Y.,Qingdao University | Zhao F.-Y.,Metrohm China Ltd. | And 4 more authors.
Chinese Chemical Letters | Year: 2013

A simple, fast, precise and eco-friendly method, based on ion chromatography (IC) with a suppressed conductivity detector, was proposed for the determination of benzoic acid (BA) in milk in this paper. The chromatographic separation was accomplished by using an anion exchange column eluted with 3.2 mmol/L aqueous Na2CO3 and 1.0 mmol/L aqueous NaHCO3 at a flow-rate of 0.7 mL/min. The method validation experiment provided excellent results with respect to linearity (correlation coefficient up to 0.9997), limit of detection (0.1 μg/L), recovery values (ranging from 88.0% to 93.0%) and relative standard deviation (RSD) (below 2.2%, n = 7). © 2013 Zong-Hua Wang.

Tao L.,Metrohm China Ltd. | Sun H.,Metrohm China Ltd. | Gong Y.,Metrohm China Ltd. | Li T.,Metrohm China Ltd.
Yejin Fenxi/Metallurgical Analysis | Year: 2012

The aluminum profile surface was usually treated by some chemical methods such as acid treatment to improve the protective property and functionality, enlarge the application range and prolong the use life. The wastewater generated in aluminum profile surface treatment contained high-concentration H + and Al 3+. Therefore, the effective monitoring of their content had important significance whether in process control or environmental protection. In this study, the content of H + and Al 3+ in wastewater was quantitatively determined by thermometric titration in first time. This method was applied to the determination of actual wastewater from aluminum factory. The results showed that the found results of this method were consistent with the theoretical values or those obtained by conventional manual titration. The recoveries of method were 99.8% and 104.1% for H + and Al 3+, respectively. The relative standard deviations (RSD, n=7) in precision test were both less than 2% for H + and Al 3+.

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