Characterization of phospholipid reverse micelles in nonaqueous systems in relation to their rejection during membrane processing

Manjula, S.; Kobayashi, Isao; Subramanian, R.

doi:10.1016/j.foodres.2011.01.059

Cited by 22 publications

(9 citation statements)

References 16 publications

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“…In the control oil containing only the NBD-PE, the emission fluorescent intensity was relatively low. It has been reported that the exposure of the NBD group to the polar environment caused the fluorescence intensity to decrease [31,32]. The NBD-PE, same as other phospholipids, preferentially resides at the oil-water interface and orients the hydrophilic head group toward the water core.…”

Section: Resultsmentioning

confidence: 99%

Association Colloids Formed by Multiple Surface Active Minor Components and Their Effect on Lipid Oxidation in Bulk Oil

Kittipongpittaya

Panya

Cui

et al. 2014

J Americ Oil Chem Soc

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Association colloids formed by surface active minor components play an important role in the oxidative stability of bulk oils. To imitate the formation of nanostructures in refined oils, multiple surface active minor components including phospholipids, free fatty acids, diacylglycerols and sterols were added to stripped corn oil. The critical micelle concentration (CMC) of the mixed components was determined. The impact of mixed minor components at below and above their CMC on oxidative stability of bulk oil and on antioxidant activity of α‐tocopherol and Trolox was investigated. The CMC of the mixed surface active components in bulk oil was 20 µmol/kg oil in the presence of 383 ± 2 ppm of water. 1,2‐Dioleoyl‐sn‐glycero‐3‐phosphocholine (DOPC) played an important role on the formation of association colloids since it was the most important component in forming the association colloids as confirmed by CMC and fluorescence probe studies. The association colloids formed by the mixed components showed prooxidative activity in bulk oil as determined by monitoring the formation of lipid hydroperoxide and hexanal. The activity of α‐tocopherol or Trolox was not changed by mixed components association colloids. These results suggest that association colloids both physically and chemically impacted the oxidative stability and activity of antioxidants in bulk oil.

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Section: Resultsmentioning

confidence: 99%

Association Colloids Formed by Multiple Surface Active Minor Components and Their Effect on Lipid Oxidation in Bulk Oil

Kittipongpittaya

Panya

Cui

et al. 2014

J Americ Oil Chem Soc

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“…Sen Gupta reported that the molecular size and molar mass of reverse micelles are 18–200 nm and < 20 kDa, respectively. These reverse micelles are larger in dimensions than triglyceride molecules; thus they can be removed effectively by ultrafiltration (UF) or nanofiltration (NF) membranes with an appropriate molecular weight cut off (MWCA) (20 kDa) …”

Section: Degumming Processmentioning

confidence: 96%

“…Inorganic membranes are reported to be expensive and brittle in nature, so composite membranes have recently been used as a promising solution to the above problem. Manjulata investigated the nonporous polymeric composite hydrophobic membrane polydimethylsiloxane as an active layer and polyimide as a support layer for phosphorus rejection in hexane‐diluted systems (82–99%). Subramanian et al .…”

Section: Degumming Processmentioning

confidence: 99%

Latest advances in degumming feedstock oils for large‐scale biodiesel production

Sharma

Yadav

Upadhyay

2018

Biofuels Bioprod Bioref

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The removal of gummy or mucilaginous substances from vegetable oils, commonly known as degumming, is required for the use of crude vegetable oils as the feedstock for biodiesel production. These gums reduce the rate of transesterification reactions by deactivation of the catalyst and they hinder the separation of the glycerol phase from the biodiesel. They also cause the deposition of carbon particles within engine machinery and affect performance. To take care of these issues, gums should be separated from the oils to make the oils suitable for use as fuel. Chemical treatment, membrane separation, and biological separation processes have been reported in the literature for this purpose. In the chemical treatment process aqueous solutions of chemicals like acids, bases, ethylenediaminetetraacetic acid (EDTA), and water are used for separating gums. The membrane separation process is based on size exclusion, and polymeric, ceramic, and inorganic membranes are used to separate gums from oil. In biological degumming, phospholipase groups of enzymes are used. These enzymes hydrolyze gums into fatty acids and lipophilic substances. Enzyme degumming also enhances oil‐phase yield. This paper reviews the chemical nature of gums and presents a comprehensive critical summary of different degumming technologies, their specific features, effecting parameters, advantages and disadvantages, and industrial uses. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…; Manjula et al . ). In an experiment simulating the refining of crude soybean and rapeseed oils, nonporous composite NTGS‐1100 (silicone‐polysulfone) or NTGS‐2100 (silicone‐polyamide) membrane‐based filtration processes managed to remove phospholipids, pigments and oxidation products in a single step (Subramanian et al .…”

Section: Introductionmentioning

confidence: 97%

“…Various attempts have been made in terms of refining edible oils using membrane technology with and without using solvents. Membrane processing has been applied to separate phospholipids as well as color, FFAs and wax components from crude oil or oil-hexane miscellas (Subramanian et al 1998b(Subramanian et al , 2004de Moura et al 2005;de Morais Coutinho et al 2009;Manjula et al 2011). In an experiment simulating the refining of crude soybean and rapeseed oils, nonporous composite NTGS-1100 (silicone-polysulfone) or NTGS-2100 (silicone-polyamide) membrane-based filtration processes managed to remove phospholipids, pigments and oxidation products in a single step (Subramanian et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of Plasma‐Modified Polyvinylidenefluoride and Polyethersulfone Ultrafiltration (UF) Membrane Treatments on Quality of Soybean Oil

Onal‐Ulusoy

2015

Journal of Food Quality

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The effects of unmodified and surface-modified polyvinylidenefluoride (PVDF) and polyethersulfone (PES) ultrafiltration membranes on quality of crude soybean oil and crude oil miscellas were studied. Membranes were modified with hexamethyldisiloxane in radiofrequency plasma polymerization (PlzP) at 60 W (PVDF) or 75 W (PES) glow discharge power for 5 min. Contact angle results indicated an interfacial free energy increase between water and solid surface by 2.1-and 12.7-fold for PVDF and PES, respectively, after PlzP, i.e., both membranes became more hydrophobic. Modified PVDF removed 10% more free fatty acids, 8-11% peroxides, and maintained 2-5% more tocopherols compared to those of unmodified PVDF and modified PES. Oxidation products and color compound removal of modified PVDF from crude oil and miscellas were similar to the commercial bleaching step and better than degumming-neutralization step. Total tocopherol loss during modified PVDF treatment was 5.3% and 5.0-6.8% for crude oil and miscellas, respectively, and these values were far below than any processing steps in commercial refining (10.4-28.4% loss). PRACTICAL APPLICATIONSPlzP coating of monomers on a polymeric-based membrane changes the membrane's chemical and physical properties due to series of sequential reactions such as oxidation, degradation and cross-linking. The predominant reactions were determined mainly with plasma power and plasma treatment time. Thus, if one can adjust the plasma parameters properly, one can create a tailor-made surface in terms of angstroms at the molecular/atomic level. The minimal refining method with plasma-modified PVDF and PES membranes described in the present study was a new practical approach to remove undesirable components from crude soybean oil as well as crude oil-hexane miscellas for meeting commercial refining standards. It simultaneously preserves the more healthy minor components found in oil.

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Characterization of phospholipid reverse micelles in nonaqueous systems in relation to their rejection during membrane processing

Cited by 22 publications

References 16 publications

Association Colloids Formed by Multiple Surface Active Minor Components and Their Effect on Lipid Oxidation in Bulk Oil

Association Colloids Formed by Multiple Surface Active Minor Components and Their Effect on Lipid Oxidation in Bulk Oil

Latest advances in degumming feedstock oils for large‐scale biodiesel production

Effects of Plasma‐Modified Polyvinylidenefluoride and Polyethersulfone Ultrafiltration (UF) Membrane Treatments on Quality of Soybean Oil

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