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- 저자 : Zeinab Mousavi (검색결과 2 건)
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Seyyed Abbas Mousavi,Foad Jahangiri,Fathollah Farhadi,Vahid Vatanpour,Behnam Sabzi,Zeinab Chenari 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
CO2-laser irradiation was used to modify the surface properties of thin-film composite (TFC) polyamide reverse osmosis (RO) membranes. These membranes were first synthesized via interfacial polymerization of m-phenylenediamine (MPD) monomers and trimesoyl chloride (TMC) over porous polysulfone ultrafiltration support, followed by a CO2-irradiation. AFM, ATR-FTIR, SEM and contact angle measurements were used to characterize the surface properties of these membranes. The ATR-FTIR results indicated that CO2-laser irradiation did not induce any functional groups on the membrane surface. However, it was found that the laser irradiation enhanced the NaCl salt rejection and slightly reduced the permeate flux. Moreover, the maintenance of the flux in modified membranes was much higher than untreated ones. Specially, after 180 min of filtration, the reduction in initial flux for the unmodified membranes was 22%. However, the reduction in initial flux for the modified membranes was less than 5%. Bovine serum albumin (BSA) filtration revealed an improvement in the antifouling properties of the modified membranes. The changes in the membrane surface morphology showed that the roughness of membrane surface is reduced significantly.
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Pectin extraction from citron peel: optimization by Box–Behnken response surface design
Bahare Pasandide,Faramarz Khodaiyan,Zeinab Mousavi,Seyed Saeid Hosseini 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.4
In this study, the effect of acidic extraction conditions (time of 30–90 min, temperature of 75–95 C and pH of 1.5–3) on the yield and degree of esterification (DE) of citron peel pectin was investigated applying Box– Behnken design. The highest production yield of pectin (28.31 ± 0.11%) was achieved at extraction time of 90 min, temperature of 95 C and pH of 1.5, as optimal extraction conditions, which was close to the predicted value (29.87%). Under optimum extraction conditions, the DE and the emulsifying activity were 51.33 and 46.2%, respectively. In addition, the emulsions were 93.9 and 93.5 stable at 4 C, 93.7 and 93.1 at 23 C after 1 and 30 days, respectively. The determination of flow behavior showed that the pectin solutions had a Newtonian behavior at low concentrations (\1.0% w/v), while this behavior was changed to pseudoplastic with increasing concentration.
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