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1.
Carbohydr Polym ; 317: 121101, 2023 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-37364963

RESUMO

The effect of the cross-linking mechanism and functional properties of soy glycinin (11S)-potato starch (PS) complexes was investigated in this study. The results showed that the binding effecting and spatial network structure of 11S-PS complexes via heated-induced cross-linking were adjusted by biopolymer ratios. In particular, 11S-PS complexes with the biopolymer ratios of 2:15, had a strongest intermolecular interaction through hydrogen bonds and hydrophobic force. Moreover, 11S-PS complexes at the biopolymer ratios of 2:15 exhibited a finer three-dimensional network structure, which was used as film-forming solution to enhance the barrier performance and mitigate the exposure to the environment. In addition, the 11S-PS complexes coating was effective in moderating the loss of nutrients, thereby extending their storage life in truss tomato preservation experiments. This study provides helpful to insights into the cross-linking mechanism of the 11S-PS complexes and the potential application of food-grade biopolymer composite coatings in food preservation.


Assuntos
Globulinas , Solanum tuberosum , Solanum tuberosum/metabolismo , Proteínas de Soja/química , Globulinas/química , Globulinas/metabolismo , Amido
2.
Food Chem ; 387: 132891, 2022 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-35421647

RESUMO

Herein, the effects of the concentration (0.1%-1.0%, w/v) and addition sequence of tea saponin (TS) on the physical stability, oxidative stability, rheological properties, and in vitro digestion of the emulsions stabilized by heat-induced soy protein isolate nanoparticles (SPs) were investigated. The results revealed that the concentration and addition sequence of TS have significant impact on the microstructure, stability, rheological properties, and in vitro digestion of the emulsions. TS was shown to not only fill the interfacial gaps but also adsorb on the particle surfaces, contributing to interfacial wettability. With increasing TS concentration, interfacial tension decay is clearly observed. Further, TS endows the droplets with electrostatic repulsion and steric resistance, preventing their flocculation, coalescence, and oxidation. Finally, in vitro digestion experiments demonstrated that the presence of TS delayed the lipid digestion of the emulsions.


Assuntos
Nanopartículas , Saponinas , Digestão , Emulsões/química , Lipídeos/química , Nanopartículas/química , Estresse Oxidativo , Tamanho da Partícula , Saponinas/química , Proteínas de Soja/metabolismo , Chá
3.
Food Funct ; 13(6): 3271-3282, 2022 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-35237775

RESUMO

Reports concerning the characteristics of soybean oil bodies (SOBs) isolated from high protein genotypes and high oil genotypes of soybeans available in the literature are insufficient and limiting. In this study, fatty acid compositions, total phenol and tocopherol contents, antioxidant capacity, and physicochemical stability of SOB emulsions recovered from three high-protein and three high-oil genotype soybeans were comparatively investigated. Principal component analysis showed that all six SOB samples could be easily discriminated based on the cultivar characteristics. Overall, the SOBs derived from the high-protein soybeans exhibited higher polyunsaturated fatty acid (PUFA) contents, while the SOBs derived from the high-oil soybeans had higher extraction yields and tocopherol contents; the tocopherol content was also positively correlated with the antioxidant capacity of the lipophilic fraction, but the difference in the total phenolic content between the two genotypes was not significant. The SOBs derived from the high-protein soybeans were more easily oxidized during storage, with 1.38- and 4-fold higher accumulation rates of lipid hydroperoxides (LPO) and thiobarbituric acid reactive substances (TBARS), respectively, in the high-protein-derived SOBs than in the high-oil-derived SOBs. In addition, the SOBs from the high-protein soybeans exhibited pronounced coalescence during storage, which was corroborated by focused confocal microscopy. These results confirmed that SOBs obtained from high-oil soybean genotypes are more suitable to manufacture OB-based products due to their superior physicochemical stability.


Assuntos
Glycine max/química , Gotículas Lipídicas/química , Óleo de Soja/química , Proteínas de Soja/análise , Antioxidantes/análise , Emulsões/química , Ácidos Graxos , Ácidos Graxos Ômega-3/análise , Peróxidos Lipídicos/análise , Microscopia Confocal , Oxirredução , Tamanho da Partícula , Fenóis/análise , Análise de Componente Principal , Sementes/química , Substâncias Reativas com Ácido Tiobarbitúrico/análise , Tocoferóis/análise
4.
J Sci Food Agric ; 102(9): 3752-3761, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34913174

RESUMO

BACKGROUND: Soybean oil bodies (SOB) are naturally pre-emulsified lipid droplets recovered directly from soybean seeds. Almost all food emulsions contain salts. However, it was not clear how the incorporation of salts affected the physicochemical stability of SOB. RESULTS: This study investigated the effect of NaCl (0-1.2%) on the physical and oxidative stability of SOB emulsions under neutral (pH 7) and acidic (pH 3) conditions. In the presence of NaCl, the SOB emulsion (pH 7) showed strong flocculation during storage due to electrostatic screening. The NaCl-induced flocculation of SOB was attenuated at pH 3, which may be due to the difference in conformation or interaction of the protein interfaces covering SOB at different pH values. The increase in ionic strength or acid conditioning treatment resulted in a remarkable increase in the stability of SOB emulsions against coalescence. The confocal laser scanning microscopy images also confirmed the NaCl-induced changes in the flocculation/coalescence properties of SOB. The oxidative behavior tests indicated that SOB emulsions containing NaCl were more susceptible to lipid oxidation but protein oxidation was inhibited due to electrostatic screening, which reduced pro-oxidant accessibility of unadsorbed proteins in the emulsion. This oxidative behavior was attenuated at pH 3. CONCLUSION: The incorporation of NaCl significantly reduced the physical and oxidative stability of the SOB emulsion, and acidic pH mitigated NaCl-induced flocculation and lipid oxidation of SOB. © 2021 Society of Chemical Industry.


Assuntos
Cloreto de Sódio , Óleo de Soja , Emulsões/química , Floculação , Concentração de Íons de Hidrogênio , Tamanho da Partícula , Proteínas/química , Sais , Cloreto de Sódio/química , Água/química
5.
Ultrason Sonochem ; 80: 105808, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34737159

RESUMO

In this study, a soy protein isolate (SPI)-pectin (PC) complex was prepared, and the effects of different high intensity ultrasound (HIU) powers on the structure and solubility of the complex were studied. Fourier transform infrared (FTIR) spectroscopy analysis exhibited that with increasing HIU power, the α-helix content of the SPI in the complex was significantly reduced, and the random coil content increased; however, an opposite trend appeared after higher power treatments. Fluorescence spectra showed that HIU treatment increased the fluorescence intensity of the complex, and the surface hydrophobicity was increased. The trend of the protein structure studied by Raman spectroscopy was similar to that of FTIR and fluorescence spectroscopy. When the HIU treatment was performed for 15 min and at 450 W power, the particle size of the complex was 451.85 ± 2.17 nm, and the solubility was 89.04 ± 0.19 %, indicating that the HIU treatment caused the spatial conformation of the protein to loosen and improved the functional properties of the complex. Confocal laser scanning microscopy (CLSM) revealed that the complex after HIU treatment exhibited improved dispersibility in water and smaller particle size. Gel electrophoresis results indicated that HIU treatment did not affect the protein subunits of the complex. Therefore, the selection of a suitable HIU treatment power can effectively improve the structural properties and solubility of SPI in the complex, and promote the application of the SPI-PC complex in food processing and industries.


Assuntos
Glycine max , Interações Hidrofóbicas e Hidrofílicas , Pectinas , Solubilidade , Proteínas de Soja , Ondas Ultrassônicas
6.
Food Funct ; 12(21): 10875-10886, 2021 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-34622257

RESUMO

Natural soy oleosomes are known to have a remarkable stability, given the advantage of their sophisticated membrane. The aim of the present study is to examine the concept of fabricating a ß-carotene emulsion stabilized by soy oleosin (OLE) and lecithin (LEC) mixtures mimicking the membrane composition of soy oleosomes while providing preferable stability and bioaccessibility. For this, the fabricated emulsion was characterized in terms of droplet size distribution, and emulsion structure, stability and digestion (release and absorption of lipophilic ß-carotene). Compared to SPI/LEC (10 : 1) stabilized emulsions, the OLE/LEC (10 : 1) mixture stabilized emulsion exhibited the highest emulsifying activity index (EAI) and emulsifying stability index (ESI) values, and higher encapsulation efficiency. Results show that the ß-carotene emulsion stabilized by OLE and LEC mixtures at the ratio of 10 : 1 (w/w) has the most uniform droplet distribution and highest stability. The in vitro gastrointestinal digestion test revealed that the ß-carotene emulsion stabilized by OLE and LEC mixtures was digested more rapidly than the emulsion stabilized by soy protein isolate (SPI) and LEC mixtures. In turn, the bioaccessibility and cellular uptake of ß-carotene were enhanced, resulting in a higher absorption, a desirable feature of nutrition delivery systems. Our results demonstrated a promising way to fabricate emulsions mimicking natural soy oleosomes.


Assuntos
Lecitinas/química , Proteínas de Soja/química , beta Caroteno/farmacologia , Células CACO-2 , Sobrevivência Celular/efeitos dos fármacos , Composição de Medicamentos , Emulsões/química , Humanos , beta Caroteno/metabolismo
7.
Ultrason Sonochem ; 77: 105700, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34364068

RESUMO

In this study, microcapsules were prepared by spray drying and embedding hemp seed oil (HSO) with soy protein isolate (SPI) and maltodextrin (MD) as wall materials. The effect of ultrasonic power on the microstructure and characteristics of the composite emulsion and microcapsules was studied. Studies have shown that ultrasonic power has a significant impact on the stability of composite emulsions. The particle size of the composite emulsion after 450 W ultrasonic treatment was significantly lower than the particle size of the emulsion without the ultrasonic treatment. Through fluorescence microscopy observation, HSO was found to be successfully embedded in the wall materials to form an oil/water (O/W) composite emulsion. The spray-dried microcapsules showed a smooth spherical structure through scanning electron microscopy (SEM), and the particle size was 10.7 µm at 450 W. Fourier transform infrared (FTIR) spectroscopy analysis found that ultrasonic treatment would increase the degree of covalent bonding of the SPI-MD complex to a certain extent, thereby improving the stability and embedding effect of the microcapsules. Finally, oxidation kinetics models of HSO and HSO microcapsules were constructed and verified. The zero-order model of HSO microcapsules was found to have a higher degree of fit; after verification, the model can better reflect the quality changes of HSO microcapsules during storage.


Assuntos
Cannabis/química , Modelos Químicos , Extratos Vegetais/química , Polissacarídeos/química , Proteínas de Soja/química , Ondas Ultrassônicas , Cápsulas , Cinética , Oxirredução
8.
Food Chem ; 343: 128407, 2021 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-33129620

RESUMO

In this study, cocoa butter equivalents (CBEs) were prepared through enzymatic interesterification of palm mid-fraction (PMF) with stearic acid (SA). The reaction process parameters were experimented and the performance of the product was analysed. PMF and stearic acid (at a mass ratio of 1:2) were catalysed by 80 g kg-1 enzyme loading of Lipozyme RM IM fromRhizomucor mieheiat 60 °C for 120 min. The yield of the CBE product was more than 92%, and the CBE resembled cocoa butter (CB) in terms of its triacylglycerol composition. The hardness of the CBE product was higher than that of CB at different storage temperatures, but this difference was not obvious at 25 °C. The polymorphic structures and SFC curve of the CBE were similar to those of the CB. In addition, the CBE could be mixed with CB in any ratio without an obvious eutectic phenomena. Up to 40% CBE could be added to CB without significantly affecting the thermodynamic properties of CB. Thus, replacing CB with the CBE product is feasible.


Assuntos
Gorduras na Dieta , Lipase/química , Óleo de Palmeira/química , Rhizomucor/enzimologia , Ácidos Esteáricos/química , Catálise , Cristalização , Esterificação , Estudos de Viabilidade , Lipase/metabolismo , Termodinâmica , Triglicerídeos/química
9.
J Agric Food Chem ; 68(36): 9796-9803, 2020 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-32786850

RESUMO

High internal phase Pickering emulsions (HIPPEs) stabilized by food-grade particles have received much attention in recent years. However, the stabilizing mechanism (e.g., structural network) in the continuous phase of HIPPEs stabilized by proteins is not well understood. In this work, we deciphered the stabilizing mechanisms that confer stability to HIPPEs produced from sunflower oil and soy protein microgels (SPMs). HIPPEs were fabricated at the protein concentrations of 1.50-2.00 wt % and oil volume fraction of 0.78-0.82. The cryo-scanning electron microscopy (cryo-SEM) observations indicated that there were two possible stabilizing mechanisms for HIPPEs at the protein concentrations of 1.50-2.00 wt %: the first is a stabilization provided by the shared monolayer of SPMs (at a protein concentration of 1.50%), and the other is stabilization provided by the distinct monolayer of SPMs (at protein concentrations of 1.75 and 2.00 wt %). The latter protein concentration created a thick network, formed by interacting SPMs, which trapped oil droplets. Results also confirmed that HIPPEs have an open-cell porous structure, forming a sponge-like morphology, where the internal phase was located. This study also investigated the digestibility of HIPPEs, suggesting a slower free fatty acid-releasing profile in in vitro intestinal digestion.


Assuntos
Emulsões/química , Microgéis/química , Proteínas de Soja/química , Digestão , Tamanho da Partícula , Porosidade , Óleo de Girassol/química
10.
J Sci Food Agric ; 100(12): 4565-4574, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32419135

RESUMO

BACKGROUND: Medium- and long- chain triacylglycerols (MLCTs) are functional structural lipids that can provide the human body with essential fatty acids and a faster energy supply. This study aimed to prepare MLCTs rich in α-linolenic by enzymatic interesterification of perilla oil and medium-chain triacylglycerols (MCTs), catalyzed by Lipozyme RM IM, Lipozyme TL IM, Lipozyme 435, and Novozyme 435 respectively. RESULTS: The effects of lipase loading, concentration of MCTs, reaction temperature, and reaction time on the yield of MLCTs were investigated. It was found that the reaction achieved more than a 70% yield of MLCTs in triacylglycerols under the conditions of 400 g kg-1 MCTs and 60 g kg-1 lipase loading after equilibrium. A novel two-stage deodorization was also applied to purify the interesterification products. The triacylglycerols reach over 97% purity in the products with significant removal (P < 0.05) of the free fatty acids, and the trans fatty acids were strictly controlled at below 1%. There was more than 40% α-linolenic in the purified products, with long-chain fatty acids mostly occupying the desired sn-2 position in acylglycerols, which are more active in hydrolysis. CONCLUSION: A series of novel α-linolenic acid-rich medium- and long-chain triacylglycerols was prepared. Under appropriate reaction conditions, the yield of MLCTs in triacylglycerols was above 70%. A novel two-stage deodorization can be used to promote the elimination of free fatty acids and limit the generation of trans fatty acids. © 2020 Society of Chemical Industry.


Assuntos
Lipase/química , Triglicerídeos/química , Ácido alfa-Linolênico/química , Biocatálise , Enzimas Imobilizadas , Ácidos Graxos/química , Proteínas Fúngicas , Óleos de Plantas/química
11.
Biomed Res Int ; 2020: 7650123, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32337275

RESUMO

Iridoid glycoside (IG) is the major active fraction extracted from the leaves of Syringa oblata Lindl. In view of its antimicrobial and antidiarrheal potential, it could be beneficial for the treatment of ulcerative colitis (UC). In the present study, IG (20, 40, and 80 mg/kg) was administered orally for 14 days to dextran sulfate sodium- (DSS-) induced colitis rats. The anti-inflammatory effects of IG on DSS-induced UC were evaluated by comparing observations in DSS-induced colitis and drug-treated groups using disease activity index (DAI), macroscopic score, histological analysis, and apoptosis assay. To elucidate the antioxidant mechanisms of IG on NOX-dependent ROS production, the activities of 8-OHdG, NOX1, and NOX2 in DSS-induced colitis were determined. The levels of proinflammatory cytokines such as IL-2, IL-4, IL-5, IL-12p40, and IL-13 were detected. The inflammation-associated protein and mRNA expressions of TLR-2, TLR-4, MyD88, and NF-κBp65 were assessed by immunohistochemistry and real-time quantitative PCR, respectively. The results suggested that IG treatment significantly reduced DAI, macroscopic score, and histological damage compared to untreated animals (p < 0.01), whereas administration of IG remarkably attenuated the upregulation of 8-OHdG, NOX1, and NOX2 and the expression of proinflammatory cytokines such as IL-2, IL-4, IL-5, IL-12p40, and IL-13 in DSS-treated rats in a concentration-dependent manner. In addition, IG treatment could dose dependently suppress the protein and mRNA levels of TLR-2, TLR-4, MyD88, and NF-κBp65. The dose of IG that produced the most significant protective effect was 80 mg/kg. The above results demonstrate that IG exerts its inhibitory effect on cell apoptosis, oxidative stress, and proinflammatory cytokines in DSS-induced colitis through modulation of the TLR2/4/MyD88/NF-κB signaling pathway.


Assuntos
Colite Ulcerativa/tratamento farmacológico , Sulfato de Dextrana/farmacologia , Glicosídeos Iridoides/farmacologia , Fator 88 de Diferenciação Mieloide/metabolismo , NF-kappa B/metabolismo , Folhas de Planta/química , Transdução de Sinais/efeitos dos fármacos , Receptor 2 Toll-Like/metabolismo , Animais , Apoptose/efeitos dos fármacos , Colite Ulcerativa/patologia , Colo/patologia , Citocinas/metabolismo , Modelos Animais de Doenças , Inflamação/patologia , Glicosídeos Iridoides/química , Masculino , NADPH Oxidase 1 , Estresse Oxidativo/efeitos dos fármacos , Extratos Vegetais/farmacologia , Substâncias Protetoras/farmacologia , Ratos , Ratos Sprague-Dawley , Syringa
12.
J Oleo Sci ; 68(9): 863-871, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31484902

RESUMO

The variations in average particle size, zeta potential, free fatty acids (FFA) release rate, and the bioavailability of menthol under in vitro simulated digestion conditions of peppermint oil nanoemulsion were investigated. 3D confocal laser scanning microscopy and Cryo-scanning electron microscopy were used to observe the microstructure characteristics of peppermint oil nanoemulsion, which indicated that soybean protein was completely adsorbed at the oil-water interface of the nanoemulsion and presented a core shell structure. And the results indicated that FFA release rate and menthol bioavailability of peppermint oil nanoemulsion prepared by using high-pressure homogenization were much higher. In the simulated gastric digestion phase, the average particle size and the zeta potential of the nanoemulsion increased, and droplet polymerization appeared. After the simulated intestinal, the interfacial protein of nanoemulsion was hydrolyzed, and the oil droplets were digested, which resulted in the decreased particle size and increased absolute value of zeta potential.


Assuntos
Emulsões/química , Nanopartículas/química , Óleos de Plantas/química , Disponibilidade Biológica , Liberação Controlada de Fármacos , Mentha piperita/química , Mentol/farmacocinética , Nanopartículas/ultraestrutura , Tamanho da Partícula , Proteínas de Soja/química , Glycine max/química
13.
J Oleo Sci ; 68(5): 409-418, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-30971642

RESUMO

The effect of high pressure homogenization (HPH) treatment (40 to 200MPa) on the structure, interfacial properties and oxidative stability of soy protein isolate emulsions were investigated. After HPH process, emulsifying activity (EAI) and emulsion stability (ESI) could be improved by 114% and 125%, percentage of protein adsorbed to oil-in-water emulsions significantly improved when the pressure was not more than 160 MPa. SDS-PAGE showed that the HPH caused more low molecular mass subunits as the samples were treated below 160 MPa. FTIR traced the changes of four conformations in the secondary structure. Within a suitable pressure range, the apparent viscosity increased with the increasing of pressure, which reflected shear thinning; rheological measurement of emulsions showed G'>G'', G' and G'' both increased significantly with frequency increasing; emulsions treated by HPH had better oxidative stability. This paper suggested the HPH was a useful method for preparation the highly viscous and stable emulsions.


Assuntos
Pressão , Proteínas de Soja/química , Emulsões , Oxirredução , Estabilidade Proteica , Reologia , Viscosidade
14.
J Oleo Sci ; 68(4): 311-320, 2019 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-30867393

RESUMO

The solubility of H2 in electrolytes, H2 reaction consumption and the conductivity of electrolytes under different pressures in an electrochemical hydrogenation reactor were studied. It was found that with an increase in H2 pressure, H2 was electrolyzed at the anode, accompanied by the generation of H+. The solubility of H2 in the electrolytes and the conductivity of the electrolytes also increased. At first, the reaction consumption increased, followed by a tendency to be stable at 3 MPa. Therefore, the electrochemical hydrogenation of soybean oil was carried out at a H2 pressure of 3 MPa. When the current was 120 mA, the temperature was 50°C, the agitation speed was 300 rpm, and the time was 7.5 h, the IV of hydrogenated soybean oil was 99.6 g I2/100 g oil, and the TFA content of the oil was 4.3%.


Assuntos
Técnicas Eletroquímicas/métodos , Hidrogênio/química , Óleo de Soja/química , Eletroquímica , Eletrólitos/química , Hidrogenação , Pressão , Solubilidade , Temperatura
15.
Food Funct ; 9(12): 6146-6154, 2018 Dec 13.
Artigo em Inglês | MEDLINE | ID: mdl-30379168

RESUMO

Oleosomes, which are pre-emulsified oil bodies found naturally in plants, have excellent stability, therefore making their use more popular in the food industries. However, the mechanism of EGCG in regulating the physicochemical and oxidative stability, and digestion of oleosome emulsions is not yet clear. In this study, the effect of EGCG on the properties of soybean oleosome emulsions (SOE) was examined at different pH values (5.0, 7.0, and 9.0). EGCG was significantly more effective in maintaining the stability of SOE at pH 5.0 and 7.0 over the 14 days of storage, but less effective at pH 9.0. Furthermore, lipid oxidation of SOE at pH 7.0 was successfully retarded by incorporating EGCG, but not at pH 5.0 and 9.0. The in vitro gastrointestinal results suggested that EGCG retarded the digestion rate of SOE based on a 20% reduction in free fatty acid release. The results of this study will help food technologists to design slow-digestive oleosome-based products that will satisfy health-conscious consumers' demand for healthier food choices.


Assuntos
Catequina/análogos & derivados , Glycine max/química , Gotículas Lipídicas/química , Extratos Vegetais/química , Catequina/química , Catequina/metabolismo , Emulsões/química , Emulsões/metabolismo , Humanos , Concentração de Íons de Hidrogênio , Gotículas Lipídicas/metabolismo , Oxirredução , Extratos Vegetais/metabolismo , Glycine max/metabolismo
16.
J Oleo Sci ; 67(6): 745-754, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29863091

RESUMO

An efficient method of ultrasound-assisted aqueous enzymatic extraction of corn germ oil was established, and its quality and antioxidant activity were studied. The optimum auxiliary extraction conditions with ultrasound were as follows: the ultrasonic treatment time was 20 minutes, and the ultrasonic temperature was 40°C. The corn germ oil extracted by the aqueous enzymatic method had better quality indexes in comparison with that exacted by the solvent. The fatty acid compositions of corn germ that was oil-extracted by two kinds of methods had almost no significant differences. The tea polyphenols (TP) exhibited remarkable antioxidant effects on corn germ oil during a storage stability test. Meanwhile, we focused on the antioxidant activity of corn germ oil, and the results showed that corn germ oil could effectively scavenge 1,1-diphenyl-2-picrylhydrazyl(DPPH), hydroxyl radical and superoxide anion free radicals. Thus, corn germ oil is a kind of functional oil with excellent antioxidant activity and could be used as a free radical scavenger in the food or other industries.


Assuntos
Antioxidantes/análise , Óleo de Milho/química , Óleo de Milho/isolamento & purificação , Qualidade dos Alimentos , Extração Líquido-Líquido/métodos , Temperatura , Ultrassom , Ácidos Graxos/análise , Armazenamento de Alimentos , Sequestradores de Radicais Livres/análise , Polifenóis , Solventes , Chá , Água
17.
J Nanosci Nanotechnol ; 18(8): 5566-5574, 2018 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-29458611

RESUMO

Pt/CNTs were synthesized with an ethylene glycol reduction method, and the effects of carboxyl functionalization, ultrasonic power and the concentration of chloroplatinic acid on the catalytic activity of Pt/CNTs were investigated. The optimal performance of the Pt/CNTs catalyst was obtained when the ultrasonic power was 300 W and the concentration of chloroplatinic acid was 40 mg/mL. The durability and stability of the Pt/CNTs catalyst were considerably better compared to Pt/C, as shown by cyclic voltammetry measurement results. The trans fatty acids content of the obtained hydrogenated soybean oil (IV: 108.4 gl2/100 g oil) using Pt/CNTs as the cathode catalyst in a solid polymer electrolyte reactor was only 1.49%. The IV of hydrogenated soybean oil obtained using CNTs as carrier with Pt loading 0.1 mg/cm2 (IV: 108.4 gl2/100 g oil) was lower than carbon with a Pt loading of 0.8 mg/cm2 (IV: 109.9 gl2/100 g oil). Thus, to achive the same IV, the usage of Pt was much less when carbon nanotubes were selected as catalyst carrier compared to traditional carbon carrier. The changes of fatty acid components and the hydrogenated selectivity of octadecenoic acid were also discussed.


Assuntos
Nanotubos de Carbono , Óleo de Soja , Ácidos Graxos trans/química , Eletrólitos , Polímeros
18.
Food Chem ; 249: 16-21, 2018 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-29407919

RESUMO

The understanding of the structure morphology of oil-rich emulsion from enzyme-assisted extraction processing (EAEP) was a critical step to break the oil-rich emulsion structure in order to recover oil. Albeit EAEP method has been applied as an alternative way to conventional solvent extraction method, the structure morphology of oil-rich emulsion was still unclear. The current study aimed to investigate the structure morphology of oil-rich emulsion from EAEP using 3D confocal Raman imaging technique. With increasing the enzymatic hydrolysis duration from 1 to 3 h, the stability of oil-rich emulsion was decreased as visualized in the 3D confocal Raman images that the protein and oil were mixed together. The subsequent Raman spectrum analysis further revealed that the decreased stability of oil-rich emulsion was due to the protein aggregations via SS bonds or protein-lipid interactions. The conformational transfer in protein indicated the formation of a compact structure.


Assuntos
Emulsões/análise , Glycine max/química , Análise Espectral Raman/métodos , Fracionamento Químico , Emulsões/química , Hidrólise , Lipídeos/química , Proteínas de Plantas/química , Pós , Solventes , Óleo de Soja/química , Água/química
19.
J Oleo Sci ; 67(1): 29-37, 2018 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-29238024

RESUMO

Fully hydrogenated expanded press soybean oil (FHEPSO) rich in naturally bioactive components was prepared using Palladium on Carbon (Pd/C) catalyst. Interesterified fat was prepared from binary blends of FHEPSO and cold press corn oil (CPCO) with FHEPSO/CPCO mass ratios of 50:50, 40:60 and 30:70. Lipozyme RM IM (6 wt% of total substrate) was used in a supercritical CO2 system to catalyze the transesterification. The fatty acid compositions had no significant changes in the fats before and after interesterification, and trans-fatty acid (TFA) was not detected. The fatty acid compositions within triacylglycerol (TAG) were rearranged, and the amounts of trisaturated and triunsaturated TAG decreased, whereas that of mixed TAG increased as a result of interesterification. The enzymatic interesterified fats (EIEF) had a lower solid fat content (SFC), broader melting and plasticity ranges compared to the noninteresterified blend (NIB). According to X-ray diffraction (XRD), the predominant crystal form had changed from ß to ß'. EIEF contained 0.33-0.51 g/100 g phospholipids, 88.6-105.6 mg/100 g total tocopherols, and 916-1053 mg/100 g total phytosterols, which could confer health benefits. The results indicated that EIEF may have a potential use in trans-free margarine stock preparation.


Assuntos
Óleo de Milho/síntese química , Margarina , Óleo de Soja/síntese química , Óleo de Milho/química , Esterificação , Ácidos Graxos/análise , Isomerismo , Fosfolipídeos/análise , Fitosteróis/análise , Óleo de Soja/química , Tocoferóis/análise
20.
J Oleo Sci ; 66(12): 1301-1310, 2017 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-29129896

RESUMO

Rosa acicularis seed oil was extracted from Rosa acicularis seeds by the ultrasonic-assisted aqueous enzymatic method using cellulase and protease. Based on a single experiment, Plackett-Burman design was applied to ultrasonic-assisted aqueous enzymatic extraction of wild rose seed oil. The effects of enzyme amount, hydrolysis temperature and initial pH on total extraction rate of wild rose seed oil was studied by using Box-Behnken optimize methodology. Chemical characteristics of a sample of Rosa acicularis seeds and Rosa acicularis seed oil were characterized in this work. The tocopherol content was 200.6±0.3 mg/100 g oil. The Rosa acicularis seed oil was rich in linoleic acid (56.5%) and oleic acid (34.2%). The saturated fatty acids included palmitic acid (4%) and stearic acid (2.9%). The major fatty acids in the sn-2 position of triacylglycerol in Rosa acicularis oil were linoleic acid (60.6%), oleic acid (33.6%) and linolenic acid (3.2%). According to the 1,3-random-2-random hypothesis, the dominant triacylglycerols were LLL (18%), LLnL (1%), LLP (2%), LOL (10%), LLSt (1.2%), PLP (0.2%), LLnP (0.1%), LLnO (0.6%) and LOP (1.1%). This work could be useful for developing applications for Rosa acicularis seed oil.


Assuntos
Ácidos Graxos/análise , Óleos de Plantas/química , Rosa/química , Sementes/química , Ácido Linoleico/análise , Ácido Oleico/análise , Ácido Palmítico/análise , Óleos de Plantas/isolamento & purificação , Ácidos Esteáricos/análise , Tocoferóis/análise , Triglicerídeos/análise , Triglicerídeos/química , Ácido alfa-Linolênico/análise
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