Processing of vegetable oils using polymeric composite membranes

Subramanian, R.; Nakajima, Mitsutoshi; Kawakatsu, Takahiro

doi:10.1016/s0260-8774(98)00106-x

Cited by 57 publications

(68 citation statements)

References 11 publications

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“…As for the other refining process, in degumming and deacidification studies using crude vegetable oils and the hydrophobic nonporous denser membrane, it was reported that phospholipid contents were rejected by greater than 96% (Subramanian and Nakajima, 1997), while free fatty acids permeated preferentially compared to triglycerides (Subramanian et al, 1998). From these results, the membrane process would have an effect on degumming, but no effect on deacidification.…”

Section: Resultsmentioning

confidence: 96%

Reduction in Oxidation Index Value of Fish Oils Using Hydrophobic Nonporous Denser Membrane Process

Miyagi

Nabetani

Nakajima

2009

FSTR

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Attempts were made to remove the oxidation products from fish oil with membrane process as an improved refining method. A study was conducted with hexane-diluted fish oils of Engraulis japonicus and Maurolicus japonicus in a batch membrane cell using hydrophobic nonporous denser membrane. Peroxide, anisidine and TOTOX values were reduced by 58-72%, 45-75% and 53-73%, respectively. During the membrane process, fatty acids compositions of both fish oils were not changed. The membrane process has an effect in the removal of oxidation products such as toxicity, off-flavor, and color compounds maintaining the beneficial function arising from polyunsaturated fatty acids of fish oils. In the fish oilhexane systems, when the oil contents of feeds were 25-33%, the oil fluxes were obtained in the range of 1.0-2.0 kg/(m 2 h). In addition, preferential permeations of hexane over fish oils through the membrane were observed.

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Section: Resultsmentioning

confidence: 96%

Reduction in Oxidation Index Value of Fish Oils Using Hydrophobic Nonporous Denser Membrane Process

Miyagi

Nabetani

Nakajima

2009

FSTR

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“…The larger complex of phospholipids formed could be easily separated from triglycerides using the UF membranes with appropriate MWCO (20,000 Da). Many researchers have used the micelle-enhanced ultrafiltration for the degumming of hexane-oil miscella, as summarized in our earlier articles [3][4].…”

Section: Membrane Processing Of Vegetable Oilsmentioning

confidence: 99%

“…The relative permeation rates in the non-porous membranes are estimated to be in the order of tocopherols, free fatty acids (FFA), triglycerides, aldehydes, peroxides, carotenoids and phospholipids [3][4]. During the membrane process phospholipids, color compounds and oxidation products were rejected while tocopherols and FFA permeated preferentially compared to triglycerides.…”

Section: Membrane Processing Of Vegetable Oilsmentioning

confidence: 99%

“…In the last couple of years, we have extensively investigated degumming and decolorization of crude vegetable oils using non-porous hydrophobic polymeric membranes [1][2][3][4]. The significance of our studies is based on evaluating the membrane technology for edible oil processing without any pretreatment and addition of chemicals and solvents.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of phospholipid reverse micelles in relation to membrane processing of vegetable oils

Subramanian

Ichikawa

Nakajima

et al. 2001

Eur. J. Lipid Sci. Technol.

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Studies were conducted to determine the critical micelle concentration (CMC) of phospholipids in vegetable oils and the size of reverse micelles to understand their rejection phenomenon in the membrane process. The CMC values of phosphatidylcholine (PC) in triolein and phospholipids in crude soybean oil were determined to be 440 and 1020 mg/kg, respectively, by using TCNQ (7,7,8,8-tetracyano-quinodimethane) solubilization technique. The surface tension measurements of these samples gave similar values of CMC. From small-angle X-ray scattering (SAXS) analysis, the size of the PC micelles was determined to be in the range of 3.56 to 4.70 nm. The characterization of reverse micelles formed in the oil system was found useful in enhancing the understanding of the possible rejection phenomenon of phospholipids by non-porous polymeric composite membranes used in our earlier studies on vegetable oils and in suggesting suitable types of membranes for the same.

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“…The solvent fluxes as a function of operation time are shown in Figure 5 presented are an average of two data sets with the corresponding standard deviation of 14,9,12,9, and 14%.…”

Section: Solvent Permeationmentioning

confidence: 99%

Solvent and pH resistance of surface crosslinked chitosan/poly(acrylonitrile) composite nanofiltration membranes

Musale

Kumar

2000

J. Appl. Polym. Sci.

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The resistance of novel surface crosslinked Chitosan/poly(acrylonitrile) (PAN) composite nanofiltration (NF) membranes to pH and organic solvents was studied with respect to the effects of crosslinking parameters, namely, glutaraldehyde concentration and crosslinking time. The pH resistance was determined by permeation of aqueous acidic (pH 2.5) and basic (pH 11) solutions as well as swelling studies in the pH range of 2.5-11. The solvent resistance was determined by swelling, immersion, and permeation studies with several industrially important organic solvents, namely methanol, ethanol, iso-propanol, methyl ethyl ketone, ethyl acetate and hexane. It was observed that the crosslinked composite membranes maintain the permeate fluxes for test solvents for2hofcontinuous operation without any significant change in flux. SEM studies on membrane samples after immersion as well as permeation with the abovementioned solvents indicated that the membrane morphology was maintained. The results are explained in terms of solvent-membrane polar and hydrophobic interactions, using solubility parameters of membrane and solvents and dielectric constants of solvents. Pure water flux and polyethylene glycol transmission data indicated that at pH 2.5 and 11, the membrane stability increased with increasing glutaraldehyde concentration and was much better at pH 11 than at pH 2.5. All surface crosslinked membranes showed reduced swelling between pH 4 -10.

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Processing of vegetable oils using polymeric composite membranes

Cited by 57 publications

References 11 publications

Reduction in Oxidation Index Value of Fish Oils Using Hydrophobic Nonporous Denser Membrane Process

Reduction in Oxidation Index Value of Fish Oils Using Hydrophobic Nonporous Denser Membrane Process

Characterization of phospholipid reverse micelles in relation to membrane processing of vegetable oils

Solvent and pH resistance of surface crosslinked chitosan/poly(acrylonitrile) composite nanofiltration membranes

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