Melting properties of some structured lipids native to high stearic acid soybean oil

Summary A food grade lipase from Rhizopus oryzae immobilized on a hybrid polysiloxane-polyvinyl alcohol matrix (SiO2-PVA) was used as the biocatalyst to mediate the interesterification reactions of a blend containing 65% milkfat and 35% soybean oil. All the reactions occurred in an inert nitrogen atmosphere in cylindrical glass reactors (80 mL) with 40 g of the milkfat-soybean oil blend. The influence of the following variables was evaluated: biocatalyst loading (250-1500 activity units per gram of blend), biocatalyst moisture content (5-20%), temperature (45-60 °C) and incubation time (2-48 h). The reactions were monitored by determining the free fatty acid content, triacylglycerol (TAGs) composition in carbon species, and the consistency of the interesterified (IE) products. The reaction conditions were set based on the parameters that provided a high interesterification yield and good consistency of the final product within the ideal range (200 to 800 gf cm-2). Hence the best results were obtained using a biocatalyst loading of 500 U g-1 of blend with 10% moisture content at 45 °C for 4 h. Under these conditions the consistency of the interesterified product was 539.7 ± 38 gf cm-2. The results demonstrated the potential of the immobilized lipase to alter the TAGs profile of the milkfat-soybean oil blend, allowing for the production of structured lipids.

Download Full-text

Genetic control of high stearic acid content in the seed oil of the sunflower mutant CAS-3

Theoretical and Applied Genetics ◽

10.1007/s001220051282 ◽

1999 ◽

Vol 99 (3-4) ◽

pp. 663-669 ◽

Cited By ~ 24

Author(s):

B. Pérez-Vich ◽

R. Garcés ◽

J. M. Fernández-Martínez

Keyword(s):

Stearic Acid ◽

Genetic Control ◽

Acid Content ◽

Seed Oil ◽

Stearic Acid Content ◽

High Stearic Acid ◽

Sunflower Mutant

Download Full-text

Evaluation of natural and epoxidized vegetable oil in elastomeric compositions for tread rubber

Journal of Elastomers & Plastics ◽

10.1177/00952443211038655 ◽

2021 ◽

pp. 009524432110386

Author(s):

Camila Taliotto Scarton ◽

Nayrim Brizuela Guerra ◽

Marcelo Giovanela ◽

Suélen Moresco ◽

Janaina da Silva Crespo

Keyword(s):

Mechanical Properties ◽

Stearic Acid ◽

Natural Rubber ◽

Soybean Oil ◽

Vegetable Oil ◽

Epoxidized Soybean Oil ◽

Natural State ◽

Vegetable Soybean ◽

Tire Industry ◽

Petroleum Derivatives

In the tire industry, the incorporation of natural origin oils in the development of elastomeric formulations has been one of the alternatives to reduce the use of petroleum derivatives, with a high content of toxic compounds. In this work, soybean vegetable oil was investigated as a lubricant and co-activator in sulfur-vulcanized natural rubber compounds. The soybean oil was used in its natural state and chemically modified by the epoxy ring’s introduction in its structure. In an internal mixer a standard formulation of natural rubber, five formulations replacing a conventional aromatic oil and stearic acid by vegetable oil, and a formulation without an activation system were prepared. The natural and epoxidized soybean oil was characterized chemically, and the elastomeric compositions were evaluated by mechanical and rheological analysis. The mechanical properties showed satisfactory results when vegetable soybean oil was used as a lubricant and could be a substitute for conventional aromatic oils, thus guaranteeing reduction of aromatic polycyclic content in the formulations. The crosslink degree and the rheological characteristics of the samples prepared with vegetable soybean oil were similar to the natural rubber standard sample. The formulations without the zinc oxide and stearic acid evidenced the need for activators in the vulcanization reaction, as they presented properties below standard. We verified that the epoxidized soybean oil, even when promoting better dispersion of the fillers, interfered in the crosslink formation, and consequently there was a decrease in the mechanical properties of these formulations. Finally, we indicated vegetable soybean oil as a substitute for aromatic oil and stearic acid, in the elastomeric compositions used to manufacture treads.

Download Full-text

Production of Structured Lipids by Enzymatic Incorporation of Caprylic Acid Into Soybean Oil

2008 2nd International Conference on Bioinformatics and Biomedical Engineering ◽

10.1109/icbbe.2008.253 ◽

2008 ◽

Cited By ~ 2

Author(s):

Li Liu ◽

Ping Liu ◽

Linyuan Li ◽

Jun-She Sun

Keyword(s):

Soybean Oil ◽

Caprylic Acid ◽

Structured Lipids

Download Full-text

Oxidative Stability of Stripped Soybean Oil during Accelerated Oxidation: Impact of Monoglyceride and Triglyceride—Structured Lipids Using DHA as sn-2 Acyl-Site Donors

Foods ◽

10.3390/foods8090407 ◽

2019 ◽

Vol 8 (9) ◽

pp. 407

Author(s):

Wang ◽

Xie ◽

Li ◽

Miao ◽

Wu

Keyword(s):

Soybean Oil ◽

Oxidative Stability ◽

Induction Period ◽

Caprylic Acid ◽

Structured Lipids ◽

Inhibitory Effect ◽

Blank Group ◽

Accelerated Oxidation ◽

Oxidative Effects ◽

Stripped Soybean Oil

The current work aimed to clarify the effects of four structured lipids, including monoglycerides with docosahexaenoic acid (2D-MAG), diacylglycerols with caprylic acid (1,3C-DAG), triglyceride with caprylic acid at sn-1,3 and DHA at sn-2 position (1,3C-2D-TAG) and caprylic triglyceride on the oxidative stability of stripped soybean oil (SSO). The results revealed that compared to the blank group of SSO, the oxidation induction period of the sample with 2 wt% 2D-MAG and that with 1,3C-DAG were delayed by 2–3 days under accelerated oxidation conditions (50 °C), indicating that 2D-MAG and 1,3C-DAG prolonged the oxidation induction period of SSO. However, the inhibitory effect of α-tocopherol on SSO oxidation was reduced by 2D-MAG after addition of 2D-MAG to SSO containing α-tocopherol. 2D-MAG exhibited different antioxidative/pro-oxidative effects in the added/non-added antioxidants system. Compared to caprylic triglyceride, DHA at the sn-2 acyl site induced oxidation of structured lipids, thus further promoting the oxidation of SSO. The antioxidant was able to inhibit not only the oxidation of DHA in the SSO, but also the transesterification of sn-2 DHA to sn-1/sn-3 DHA in the structured lipid.

Download Full-text

Magnetically separable Ru-containing catalysts in supercritical deoxygenation of fatty acids

Pure and Applied Chemistry ◽

10.1515/pac-2019-1012 ◽

2020 ◽

Vol 92 (6) ◽

pp. 817-826

Author(s):

Antonina A. Stepacheva ◽

Yury V. Lugovoy ◽

Oleg V. Manaenkov ◽

Alexander I. Sidorov ◽

Valentina G. Matveeva ◽

...

Keyword(s):

Fatty Acids ◽

Magnetic Properties ◽

Catalytic Activity ◽

Magnetic Nanoparticles ◽

Stearic Acid ◽

Ruthenium Oxide ◽

Hypercrosslinked Polystyrene ◽

High Stearic Acid ◽

Magnetically Separable ◽

Effect Of Support

AbstractIn the current paper, the possibility of the use of magnetically separable catalysts containing ruthenium oxide species in the supercritical deoxygenation of stearic acid for producing of the second generation of biodiesel is reported. Three different supports (silica, ceria, and hypercrosslinked polystyrene) were used for the stabilization of magnetic nanoparticles (MNPs) and Ru-containing particles. The effect of support on the magnetic properties as well as the catalytic activity of the obtained systems was studied. All synthesized catalysts were shown to provide high stearic acid conversion (up to 95 %). The highest yield of C17+ hydrocarbons (up to 86 %) was observed while using the Ru–Fe3O4-HPS system. Ru–Fe3O4-HPS was characterized by the high values of the specific surface area (364 m2/g) and saturation magnetization (4.5 emu/g). The chosen catalytic system was found to maintain its catalytic activity for a minimum of 10 consecutive cycles.

Download Full-text