Modeling the effects of microfluidization conditions on properties of corn bran |
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Affiliation: | 1. VTT, Tietotie 2, 02044 VTT, Finland;2. Department of Soil, Plant and Food Sciences, University of Bari, 70126 Bari, Italy;3. Department of Clinical Nutrition, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, FIN-70211 Kuopio, Finland |
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Abstract: | Corn bran was microfluidized through a 200-μm channel in the pressure range of 124.1–158.7 MPa for 1–5 passes following the central composite experimental design. Physicochemical properties and antioxidant properties of microfluidized bran samples were measured and fitted to the second order polynomial model. The response surface equations obtained showed that all the properties examined had a positive linear relationship with pressure and a negative quadratic relationship with number of passes except for ABTS radical scavenging activity which was quadratically related to both processing parameters. The number of passes generally had a more pronounced effect on the examined properties compared with pressure. Within the experimental range, the maximum values of swelling capacity, water-holding capacity, and oil-holding capacity were respectively 10.62 ml/g d.w. (at 158.7 MPa), 5.49 g water/g d.w. (at 158.7 MPa), and 4.61 g oil/g d.w. (at 124.1 MPa); the maximum values of surface reactive phenolic content, DPPH and ABTS radical scavenging activities were 148.80 mg/FAE g d.w. (at 158.7 MPa), 50.02 μmol TE/g d.w. (at 158.7 MPa), and 47.90 μmol TE/g d.w. (at 145.9 MPa), respectively. All maximum values of the properties occurred at 5 passes. |
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Keywords: | Microfluidization Corn bran Pressure Number of passes ABTS" },{" #name" :" keyword" ," $" :{" id" :" kwrd0035" }," $$" :[{" #name" :" text" ," _" :" 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) AP" },{" #name" :" keyword" ," $" :{" id" :" kwrd0045" }," $$" :[{" #name" :" text" ," _" :" adequate precision CS" },{" #name" :" keyword" ," $" :{" id" :" kwrd0055" }," $$" :[{" #name" :" text" ," _" :" calculated specific surface area CV" },{" #name" :" keyword" ," $" :{" id" :" kwrd0065" }," $$" :[{" #name" :" text" ," _" :" coefficient of variation DPPH" },{" #name" :" keyword" ," $" :{" id" :" kwrd0075" }," $$" :[{" #name" :" text" ," _" :" 1,1-diphenyl-2-picrylhydrazyl radical FAE" },{" #name" :" keyword" ," $" :{" id" :" kwrd0085" }," $$" :[{" #name" :" text" ," _" :" ferulic acid equivalents MV" },{" #name" :" keyword" ," $" :{" id" :" kwrd0095" }," $$" :[{" #name" :" text" ," _" :" mean volume diameter OHC" },{" #name" :" keyword" ," $" :{" id" :" kwrd0105" }," $$" :[{" #name" :" text" ," _" :" oil-holding capacity PSD" },{" #name" :" keyword" ," $" :{" id" :" kwrd0115" }," $$" :[{" #name" :" text" ," _" :" particle size distribution SC" },{" #name" :" keyword" ," $" :{" id" :" kwrd0125" }," $$" :[{" #name" :" text" ," _" :" swelling capacity SRPC" },{" #name" :" keyword" ," $" :{" id" :" kwrd0135" }," $$" :[{" #name" :" text" ," _" :" surface reactive phenolic contents SS" },{" #name" :" keyword" ," $" :{" id" :" kwrd0145" }," $$" :[{" #name" :" text" ," _" :" sum of squares TE" },{" #name" :" keyword" ," $" :{" id" :" kwrd0155" }," $$" :[{" #name" :" text" ," _" :" Trolox equivalents TEAC" },{" #name" :" keyword" ," $" :{" id" :" kwrd0165" }," $$" :[{" #name" :" text" ," _" :" Trolox equivalent antioxidant capacity TROLEX" },{" #name" :" keyword" ," $" :{" id" :" kwrd0175" }," $$" :[{" #name" :" text" ," _" :" 6-hydroxy-2,5,7,8-tetramehylchroman-2-carboxylic acid WHC" },{" #name" :" keyword" ," $" :{" id" :" kwrd0185" }," $$" :[{" #name" :" text" ," _" :" water-holding capacity |
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