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Journal of Oleo Science

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https://www.readbyqxmd.com/read/28239064/theoretical-aspects-of-triacylglycerin-positional-isomer-separation-on-reverse-phase-high-performance-liquid-chromatography
#1
Tsugihiko Hirano, Keiichi Yokochi, Koretaro Takahashi
The purpose of the present study is to bear our hypothesis and to make a profound discussion on the theoretical aspects of triacylglycerin (TG) positional isomer separation on reverse phase high performance liquid chromatography (HPLC). Authentic triacid TG positional isomers and authentic diacid TG positional isomers were injected to a monomeric and polymeric HPLC. Relationship between TG molecular structure and those elution profiles were carefully analyzed. In polymeric column, thickness of the ODS chain is high compared to monomeric column...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239063/fatty-acid-and-lipid-class-composition-of-the-microalga-phaeodactylum-tricornutum
#2
Yu-Hong Yang, Lei Du, Masashi Hosokawa, Kazuo Miyashita, Yume Kokubun, Hisayoshi Arai, Hiroyuki Taroda
n-3 Polyunsaturated fatty acids (PUFAs) are essential for the prevention and/or risk reduction of some diseases, including cardiovascular diseases and cancer. Therefore, PUFAs-rich marine microalgae have received considerable research attention. The diatom Phaeodactylum tricornutum, a rich source of lipids and fucoxanthin, has commercial applications in the food and pharmaceutical industries. In this study, the lipid class composition and fatty acid distribution in P. tricornutum under high-density and scale-up cultivation were investigated by thin-layer chromatography and gas chromatography...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239062/flash-extraction-and-physicochemical-characterization-of-oil-from-elaeagnus-mollis-diels-seeds
#3
Lina Kan, Lin Wang, Qingzhen Ding, Yanwen Wu, Jie Ouyang
A flash extraction method was used to isolate Elaeagnus mollis oil (EMO). The optimal extraction parameters, sample/solvent ratio and extraction temperature, were determined to be 1:10 (g/mL) and 40°C, respectively. Especially, the extraction yield reached 49.30% when the extraction time was as short as 2 min. No obvious difference was observed in fatty acid composition, iodine value, saponification number, total phenolic content and tocopherol content between flash-extracted EMO and Soxhlet-extracted EMO, but their physicochemical values were lower than those of cold-pressed EMO...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239061/evaluation-of-the-mechanisms-of-mayonnaise-phospholipid-oxidation
#4
Shunji Kato, Tatsuya Iseki, Yasuhiko Hanzawa, Yurika Otoki, Junya Ito, Fumiko Kimura, Teruo Miyazawa, Kiyotaka Nakagawa
Mayonnaise, which is widely used in foods, is rich in lipids and therefore susceptible to oxidation during the manufacturing process, which can result in loss of quality. Herein, we detected and analyzed phosphatidylcholine hydroperoxide (PCOOH) isomers present in fresh mayonnaise using LC-MS/MS. The PCOOH isomer composition suggests that mayonnaise phospholipid peroxidation is predominantly initiated by radical-oxidation (i.e. upon autoxidation), rather than singlet oxygen-oxidation (e.g. upon light exposure), during manufacturing, packaging and/or storage...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239060/polydimethylsiloxane-droplets-exhibit-extraordinarily-high-antioxidative-effects-in-deep-frying
#5
Nagao Totani, Naoko Yazaki, Miho Yawata
The addition of more than about 1 ppm polydimethylsiloxane (PDMS) into oil results in PDMS forming both a layer at the oil-air interface and droplets suspended in the oil. It is widely accepted that the extraordinarily strong and stable antioxidative effects of PDMS are due to the PDMS layer. However, the PDMS layer showed no antioxidative effects when canola oil did not contain droplets but rather was covered with a layer of PDMS, then subjected to heating under high agitation to mimic deep-frying. Furthermore, no antioxidative effect was exhibited by oil-soluble methylphenylsiloxane (PMPS) in canola oil or by PDMS in PDMS-soluble canola oil fatty acid ester during heating, suggesting that PDMS must be insoluble and droplets in oil in order for PDMS to exhibit an antioxidative effect during deep-frying...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239059/contact-and-repellant-activities-of-zerumbone-and-its-analogues-from-the-essential-oil-of-zingiber-zerumbet-l-smith-against-lasioderma-serricorne
#6
Yan Wu, Shan-Shan Guo, Dong-Ye Huang, Cheng-Fang Wang, Jian-Yu Wei, Zhi-Hua Li, Jian-Sheng Sun, Jia-Feng Bai, Zhao-Fu Tian, Ping-Juan Wang, Shu-Shan Du
The contact toxicity and repellent activities of the essential oil extracted from the rhizomes of Zingiber zerumbet (L.) Smith (Zingiberaceae) was evaluated against cigarette beetles (Lasioderma serricorne). The essential oil obtained by hydrodistillation was investigated by GC-FID and GC-MS. The main constituents of the essential oil were zerumbone (40.2%), α-caryophyllene (8.6%), humulene epoxide II (7.3%), camphene (5.9%) and fenchene (4.7%). Zerumbone and its analogues totally are accounting for 60.3% of the essential oil...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239058/a-nuclear-magnetic-resonance-spectroscopy-approach-to-discriminate-the-geographic-origin-of-roasted-asian-sesame-oils
#7
Gyungsu Jin, Jeongeun Kim, Yunhee Lee, Jinyeong Kim, Casimir C Akoh, Hyang Sook Chun, Sangdoo Ahn, Byung Hee Kim
The aim of this study was to discriminate the geographic origin of Korean, Chinese, and Indian sesame oils distributed in Korea using (1)H NMR spectroscopy in combination with canonical discriminant analysis (CDA). (1)H NMR spectra were obtained from 84 roasted oil samples prepared from 51 Korean, 19 Chinese, and 14 Indian sesame seeds. The integration values of 26 peaks observed in the NMR spectra were determined and normalized on the basis of the peak derived from the terminal CH3 of the fatty acids (0.7446-1...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239057/immobilization-of-lipase-from-geobacillus-sp-and-its-application-in-synthesis-of-methyl-salicylate
#8
Kamal Kumar Bhardwaj, Nitin Kumar Saun, Reena Gupta
The present study showed unique properties of an alkaline, thermophilic lipase of Geobacillus sp. which was isolated from soil of hot spring. The study was aimed to investigate the optimum immobilization conditions of lipase onto silica gel matrix (100-200 mesh) by surface adsorption method and its application in the synthesis of methyl salicylate. Lipase immobilized by surface adsorption onto silica pretreated with 4% glutaraldehyde showed 74.67% binding of protein and the optimum binding time for glutaraldehyde was found to be 2 h...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239056/thermodynamic-analysis-of-the-transition-of-liquid-crystals-from-lamellar-to-vesicular-phase
#9
Yasutaka Enomoto, Yoko Imai, Kazuo Tajima
Here, we report the results of thermodynamic analyses on the lamellar-vesicular transition for a cationic amphiphilic species, namely 2-hydroxyethyl di(alkanol)oxyethyl methylammonium methylsulfate (DEAE). Previously, we have shown that spontaneous vesicle formation from a Lα-lamellar liquid crystal (LC) phase only occurs on the addition of a quantitative amount of additives to the DEAE LC at certain temperatures and that this change occurs without the input of any extra mechanical energy. These lamellar-vesicular transitions occur in two steps: the first step is the formation of an excited state, caused by the solubilization of organic substances in the bilayer structure...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28239055/changes-in-lipid-oxidation-and-fatty-acids-in-altay-sheep-fat-during-a-long-time-of-low-temperature-storage
#10
Yu Li, Ying Biao Li, Cheng Jiang Liu
Previously, we have shown that the fatty acid composition of Altay sheep tail fat is of reasonable value and is suitable for further development of possible commercial products. Changes in lipids of Altay sheep tail fat during 50 days of 4°C refrigerated storage were investigated. Lipid oxidation and lipolysis occurred during the storage. The pH showed a continually decreased from first day to the end of the storage (p < 0.05). The lipid oxidation was determined by peroxide value (PV) and thiobarbituric acid-reactive substances (TBARS)...
February 24, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190809/electrocapillary-phenomena-at-edible-oil-saline-interfaces
#11
Satoshi Nishimura, Takuya Ohzono, Kohei Shoji, Shin Yagihara, Masafumi Hayashi, Hisao Tanaka
Interfacial tension between edible oil and saline was measured under applied electric fields to understand the electrocapillary phenomena at the edible oil/saline interfaces. The electric responses of saline droplets in edible oil were also observed microscopically to examine the relationship between the electrocapillary phenomena and interfacial polarization. When sodium oleate (SO) was added to edible oil (SO-oil), the interfacial tension between SO-oil and saline decreased. However, no decrease was observed for additive-free oil or oleic acid (OA)-added oil (OA-oil)...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190808/quantification-of-triacylglycerol-molecular-species-in-edible-fats-and-oils-by-gas-chromatographyflame-ionization-detector-using-correction-factors
#12
Kazuaki Yoshinaga, Junji Obi, Toshiharu Nagai, Hiroyuki Iioka, Akihiko Yoshida, Fumiaki Beppu, Naohiro Gotoh
In the present study, the resolution parameters and correction factors (CFs) of triacylglycerol (TAG) standards were estimated by gas chromatography-flame ionization detector (GC-FID) to achieve the precise quantification of the TAG composition in edible fats and oils. Forty seven TAG standards comprising capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, and/or linolenic acid were analyzed, and the CFs of these TAGs were obtained against tripentadecanoyl glycerol as the internal standard...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190807/poly-styrene-co-acrylonitrile-particles-prepared-by-phase-inversion-of-w-o-emulsions
#13
Shuji Ichikawa, Yoshiro Imura, Takeshi Kawai
In this paper, we describe a particle preparation method that combines phase inversion of water in oil (W/O) emulsions with solidification of polymers dissolved in the emulsion droplets, induced by introducing a poor solvent, in order to prepare poly(styrene-co-acrylonitrile) (SAN) particles with a relatively narrow size distribution. W/O emulsions containing SAN are prepared by adding an aqueous solution of polyvinylalcohol (PVA) as a protective colloid into a methylethylketone (MEK) solution of SAN. Sufficient addition of the aqueous solution causes the precipitation of SAN particles from MEK followed by phase inversion from W/O emulsions to oil in water (O/W) emulsions...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190806/optimization-of-the-enzymatic-synthesis-of-biodiesel-from-terminalia-cattapa-l-kernel-oil-using-response-surface-methodology
#14
Dedy Suhendra, Erin Ryantin Gunawan, Arista Dewi Nurita, Desy Komalasari, Teguh Ardianto
The synthesis of biodiesel using Terminalia cattapa L. (local language: Ketapang) kernel oil and ethanol has been conducted. The effect of variable parameters of synthesis includes reaction time (3-7 h), temperature (35-60°C), amount of enzyme (0.1-0.3 g) and substrate molar ratio (ketapang kernel oil to ethanol, 1:1-1:3) were studied. Response surface methodology based on a five-level and four-variable central composite rotatable design were used to evaluate the interactive effects of the sinthesis parameters on the percentage yield of biodiedsel...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190805/mass-spectrometric-discrimination-of-squalene-monohydroperoxide-isomers
#15
Naoki Shimizu, Hannah Bersabe, Junya Ito, Shunji Kato, Ryo Towada, Takahiro Eitsuka, Shigefumi Kuwahara, Teruo Miyazawa, Kiyotaka Nakagawa
Squalene (SQ), a main component of human sebum, is readily photooxidized by exposure to sunlight, producing six squalene monohydroperoxide (SQ-OOH) isomers. Despite its known connection to various skin conditions, few studies have sought to analyze SQ-OOH at the isomeric level. In this study, we aimed to develop a method to discriminate each SQ-OOH isomer with the use of tandem mass spectrometry (MS/MS). The six standard SQ-OOH isomers were prepared by photooxidizing SQ in the presence of rose bengal, a photosensitizer, and isolated by semipreparative high-performance liquid chromatography (HPLC)...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190803/characterization-of-a-novel-rhamnose-containing-acidic-glycosphingolipid-from-the-ascidian-halocynthia-aurantium
#16
Hisao Kojima, Ryota Shinohara, Saki Itonori, Masahiro Ito
Halocynthia aurantium, an edible ascidian species belonging to Urochordata, was subjected to structural characterization of acidic glycosphingolipids to investigate these molecules in ascidians: sulfatide from Ciona intestinalis and the glucuronic acid-containing acidic glycosphingolipid from H. roretzi. Acidic glycosphingolipids containing three or five sugars were isolated from soft parts of the ascidian H. aurantium by chloroform-methanol extraction, mild-alkaline hydrolysis, precipitation with cold acetone, and subsequent column chromatography using a DEAE-Sephadex A-25 column, a Florisil column, and an Iatrobead column...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190802/alternate-spray-coating-for-the-direct-fabrication-of-hydroxyapatite-films-without-crystal-growth-step-in-solution
#17
Satoshi Watanabe, Rei Kashiwagi, Mutsuyoshi Matsumoto
We discuss an alternate spray-coating technique for the direct fabrication of hydroxyapatite films using metal masks, suction-type spray nozzles and two calcification solutions of calcium hydroxide and phosphoric acid aqueous solutions. Hydroxyapatite films were formed only on the hydrophobic surface of the substrates. Scanning electron microscopy and energy dispersive X-ray spectroscopy showed that the spray-coated films consisted of hydroxyapatite nanoparticles. The Ca/P ratio was estimated to be about 1...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190801/acaricidal-potentials-of-the-terpene-rich-essential-oils-of-two-iranian-eucalyptus-species-against-tetranychus-urticae-koch
#18
Asgar Ebadollahi, Jalal Jalali Sendi, Mostafa Maroufpoor, Mehdi Rahimi-Nasrabadi
There is a rapid growth in the screening of plant materials for finding new bio-pesticides. In the present study, the essential oils of E. oleosa and E. torquata leaves were extracted using a Clevenger apparatus and their chemical profiles were investigated by Gas Chromatography-Mass Spectrometry (GC-MS). Among identified compounds, the terpenes had highest amount for both essential oils; 93.59% for E. oleosa and 97.69% for E. torquata. 1,8-Cineole (31.96%), α-pinene (15.25%) and trans-anethole (7.32%) in the essential oil of E...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190804/investigating-the-distribution-of-stable-paramagnetic-species-in-an-apple-seed-using-x-band-epr-and-epr-imaging
#19
Kouichi Nakagawa, Boris Epel
This study investigated the location and distribution of paramagnetic species in apple seeds using electron paramagnetic resonance (EPR) and X-band (9 GHz) EPR imaging (EPRI). EPR primarily detected two paramagnetic species per measured seed. These two different radical species were assigned as stable radicals and Mn(2+) species based on the g values and hyperfine components. The signal from the stable radical was noted at g ≈ 2.00 and was strong and relatively stable. The subsequent noninvasive EPRI of the radical present in each seed revealed that the stable radicals were located primarily in the seed coat, with very few radicals observed in the cotyledon of the seed...
March 1, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28100887/production-of-a-health-beneficial-food-emulsifier-by-enzymatic-partial-hydrolysis-of-phospholipids-obtained-from-the-head-of-autumn-chum-salmon
#20
A K M Azad Shah, Toshihiro Nagao, Hideyuki Kurihara, Koretaro Takahashi
Phospholipids and their partial hydrolysates, namely lysophospholipids (LPLs), have been widely used in food, pharmaceutical, and cosmetic products as highly efficient emulsifiers. This study was conducted to produce docosahexaenoic acid (DHA)-esterified LPLs by enzymatic modification of phospholipids obtained from the head of autumn chum salmon (Oncorhynchus keta). The emulsifying properties of the obtained LPLs were also evaluated. Two different types of substrates of salmon head phospholipids were prepared via silica gel and cold acetone precipitation...
February 1, 2017: Journal of Oleo Science
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