Journal of the American Oil Chemists Society最新文献

Effect of Adverse Storage Conditions on Oil Quality and Tocochromanol Content in Yellow-Seeded Breeding Lines of Brassica napus L. 不良贮藏条件对甘蓝型黄种选育品系油质及Tocochromanol含量的影响

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-27 DOI: 10.1002/aocs.70005

Aleksander Siger, Marzena Gawrysiak-Witulska, Joanna Szczechowiak-Pigłas, Iwona Bartkowiak-Broda

{"title":"Effect of Adverse Storage Conditions on Oil Quality and Tocochromanol Content in Yellow-Seeded Breeding Lines of Brassica napus L.","authors":"Aleksander Siger, Marzena Gawrysiak-Witulska, Joanna Szczechowiak-Pigłas, Iwona Bartkowiak-Broda","doi":"10.1002/aocs.70005","DOIUrl":"10.1002/aocs.70005","url":null,"abstract":"<div>\u0000 \u0000 <p>This study evaluated the contents of tocopherols and plastochromanol-8, as well as the acid values, in oils extracted from yellow-seeded \u0000 <i>Brassica napus</i>\u0000 L. lines stored under adverse post-harvest conditions. Seeds were stored at temperatures of 25°C and 30°C, with adjusted seed moisture contents of 10.5%, 12.5%, and 15.5%, corresponding to relative humidity levels of 81%, 85%, and 91%, respectively. A statistically significant reduction in total tocopherol content—up to 22% (<i>p</i> < 0.05)—was observed in seeds with the highest moisture content (15.5%) stored at 30°C. In contrast, seeds with 12.5% moisture stored at 25°C exhibited a smaller but still significant decrease of 11%–14% (<i>p</i> < 0.05). The lowest tocopherol degradation (2%–5%) occurred in seeds with 10.5% moisture stored at 25°C. Additionally, degradation rates differed between tocopherol homologues: α-tocopherol decreased more rapidly than γ-tocopherol, as evidenced by a significant decline in the α-T/γ-T ratio under high-moisture and high-temperature conditions. The most pronounced reduction in this ratio was recorded in seeds stored with 15.5% moisture at 30°C. Plastochromanol-8 was also highly sensitive to storage parameters, exhibiting an even more pronounced reduction than tocopherols under high-moisture conditions (<i>p</i> < 0.05). A significant increase in acid value was also observed under high temperature and moisture conditions, exceeding the acceptable threshold of 3.0 mg KOH/g in some cases, indicating advanced lipid hydrolysis during storage.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1477-1486"},"PeriodicalIF":2.4,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation of Lipase Selectivity Through Conformational Engineering and Reaction Media: A Review 利用构象工程和反应介质调节脂肪酶选择性的研究进展

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-22 DOI: 10.1002/aocs.70004

Jiawei Zheng, Xin Wang, Lihong He, Nanjing Zhong

{"title":"Modulation of Lipase Selectivity Through Conformational Engineering and Reaction Media: A Review","authors":"Jiawei Zheng, Xin Wang, Lihong He, Nanjing Zhong","doi":"10.1002/aocs.70004","DOIUrl":"10.1002/aocs.70004","url":null,"abstract":"<div>\u0000 \u0000 <p>Lipase selectivity is a key factor in determining the efficiency, specificity, and applicability of lipases in various industrial processes. It is also a significant aspect in the theoretical understanding of enzymatic reactions and the design of improved biocatalysts through protein engineering. This paper presents a comprehensive review of strategies employed in conformational engineering and the selection of reaction media to modulate the selectivities of lipases. It examines various factors that influence conformational engineering, such as organic solvents, pH levels, ionic liquids, reaction temperatures, additives, and immobilization techniques. Additionally, the review analyzes the impact of reaction media, including the use of organic solvents, supercritical fluids, and ionic liquids and the means of energy transfer (microwave irradiation) on selectivity. Special emphasis is placed on the modulation of product selectivity in glycerolysis reactions by using ionic liquids as the reaction media. This review aims to provide insights for the design of enzymatic selective catalysis mediated by lipases and to lay the groundwork for understanding the mechanisms of selective catalysis at the molecular structural level. By exploring these strategies and their effects on lipase selectivity, the paper contributes to the advancement of more efficient and targeted enzymatic processes in various industrial applications.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1453-1475"},"PeriodicalIF":2.4,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatty Acid Distribution and Oxidative Stability of DHA/EPA-Enriched Structured Lipids From Virgin Coconut Oil 初榨椰子油中富含DHA/ epa的结构化脂质的脂肪酸分布和氧化稳定性

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-22 DOI: 10.1002/aocs.70002

Lanh Van Nguyen, Fereidoon Shahidi

{"title":"Fatty Acid Distribution and Oxidative Stability of DHA/EPA-Enriched Structured Lipids From Virgin Coconut Oil","authors":"Lanh Van Nguyen, Fereidoon Shahidi","doi":"10.1002/aocs.70002","DOIUrl":"10.1002/aocs.70002","url":null,"abstract":"<div>\u0000 \u0000 <p>Novel structured lipids (SLs) were successfully produced from virgin coconut oil (VCO) and docosahexaenoic acid (DHA) and/or eicosapentaenoic acid (EPA). Stereospecific analysis results indicated that both DHA and EPA were predominantly esterified at the sn-1 and sn-3 positions. For DHA-enriched VCO, caprylic acid (CyA, C8:0) was mainly esterified at the sn-2 position, while capric acid (CaA, C10:0) and lauric acid (LaA, C12:0) were primarily located at the sn-3 position. In EPA and DHA + EPA-enriched VCO, C8:0 and C10:0 were almost randomly distributed across all three positions, except for C12:0, which was mostly found at the sn-2 position. The oxidative stability results of the SLs showed higher levels of conjugated dienes (CD) and 2-thiobarbituric acid reactive substances (TBARS) after 12 days of storage. Furthermore, the primary volatile compounds identified in the SLs using headspace gas chromatography–mass spectrometry (HS GC–MS) included acetaldehyde, propanal, and 2-propenal (acrolein), which were absent in the unmodified oils. These results indicate that the modified oils exhibited a higher susceptibility to oxidation compared to their unmodified counterparts. Oils high in polyunsaturated fatty acids (PUFAs) require protection from oxidation to mitigate the detrimental effects of oxidation products and preserve their nutritional and health benefits.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1439-1452"},"PeriodicalIF":2.4,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Direct and Practical Approach to Assessing the Impact of Emulsion Composition on Vitamin A Stability 一种评估乳剂成分对维生素A稳定性影响的直接实用方法

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-15 DOI: 10.1002/aocs.70000

M. De Vreese, E. Durand, B. Baréa, D. Morvan, C. Aleman, J. Lecomte, P. Villeneuve

{"title":"A Direct and Practical Approach to Assessing the Impact of Emulsion Composition on Vitamin A Stability","authors":"M. De Vreese, E. Durand, B. Baréa, D. Morvan, C. Aleman, J. Lecomte, P. Villeneuve","doi":"10.1002/aocs.70000","DOIUrl":"10.1002/aocs.70000","url":null,"abstract":"<p>Vitamin A is an essential micronutrient involved in vision, immunity, and growth. Despite its widespread use in food, cosmetic, and pharmaceutical products, vitamin A is highly prone to oxidation due to its conjugated double bonds, leading to reduced biological activity and efficacy. While various formulation strategies have been explored to enhance its stability, there is a notable lack of stability data and understanding of vitamin A oxidation, particularly in dispersed systems. This study aimed to evaluate the oxidative stability of vitamin A in model emulsions and identify how emulsion composition affects its degradation. Studying the influence of emulsion composition provides a better understanding of the possible oxidation pathways, including a nonradical pathway. An innovative method combining gentle emulsification via solvent displacement with real-time degradation monitoring was used. Retinyl palmitate (RP) demonstrated the highest stability compared to retinol (RO) and retinyl acetate (RA), due to structural and electronic factors. Among emulsifiers, the cationic type slightly improved stability by repelling positively charged pro-oxidant molecules. Three phenolic antioxidants, α-tocopherol (TOH), butylated hydroxytoluene (BHT), and carnosic acid (CA), improved stability, with TOH being the most effective. However, early-stage degradation could not be completely prevented, suggesting the existence of a predominant nonradical degradation pathway. The impact of iron (Fe<sup>2+</sup>) was minimal and attributed to the low hydroperoxide production, reinforcing the hypothesis of a nonradical initiation. Additionally, electrostatic repulsion in positively charged emulsions further limited iron's pro-oxidant effect. These findings enhance our understanding of vitamin A oxidation mechanisms and highlight potential stabilization strategies for its formulation in emulsified systems.</p>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1425-1437"},"PeriodicalIF":2.4,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aocs.onlinelibrary.wiley.com/doi/epdf/10.1002/aocs.70000","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of the Culture Medium for Efficient Nervonic Acid Production by Engineered Rhodosporidium toruloides 工程红孢子虫高效产神经酸培养基的优化

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-15 DOI: 10.1002/aocs.70001

Feixiang Liu, Chenan Jiang, Tingting Lu, Xiaoxin Liu, Erzheng Su

{"title":"Optimization of the Culture Medium for Efficient Nervonic Acid Production by Engineered Rhodosporidium toruloides","authors":"Feixiang Liu, Chenan Jiang, Tingting Lu, Xiaoxin Liu, Erzheng Su","doi":"10.1002/aocs.70001","DOIUrl":"10.1002/aocs.70001","url":null,"abstract":"<div>\u0000 \u0000 <p>Nervonic acid (NA), a very long-chain monounsaturated fatty acid with critical roles in neurological health and brain development, has garnered increasing interest for microbial production via metabolic engineering. Previously, the laboratory constructed a recombinant strain using \u0000 <i>Rhodosporidium toruloides</i>\u0000 as the chassis, which is capable of synthesizing NA. However, the lack of systematic medium optimization remains a major bottleneck for enhancing NA titers in the engineered strains. This study aimed to develop an economical and efficient fermentation medium for NA biosynthesis using the engineered strain in shake-flask cultures. Through one-factor-at-a-time optimization, glucose and corn steep liquor (CSL) were identified as the optimal carbon and organic nitrogen sources, respectively. Further analysis revealed that precise concentrations of glucose (120 g/L), CSL (10 g/L), and ammonium sulfate (1.1 g/L) were critical for balancing cell growth and lipogenesis. Notably, inorganic salts (CaCl<sub>2</sub>, MgSO<sub>4</sub>·7H<sub>2</sub>O, KH<sub>2</sub>PO<sub>4</sub>) were dispensable in the presence of CSL, which inherently supplied essential trace elements. Maintaining the initial pH at its natural value (4.3) proved optimal, as artificial pH adjustments severely impaired lipid accumulation. Under the optimized conditions, the NA titer reached 7.5 g/L, representing a 29.3% increase over the initial medium (5.8 g/L) and establishing the highest reported shake-flask titer for microbial NA production. This work not only provides a cost-effective medium formulation by eliminating inorganic salts and utilizing low-cost CSL but also offers strategic insights for scaling up NA biosynthesis in bioreactors. The findings underscore the importance of tailored nutrient optimization in aligning metabolic engineering advancements with bioprocess practicality.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1413-1423"},"PeriodicalIF":2.4,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physicochemical Stability and Sensory Evaluation of Novel Fish Oil Fortified Plant Milk Beverages 新型鱼油强化植物乳饮料的理化稳定性及感官评价

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-07-07 DOI: 10.1002/aocs.12975

Abigail A. Sommer, Yael Vodovotz

{"title":"Physicochemical Stability and Sensory Evaluation of Novel Fish Oil Fortified Plant Milk Beverages","authors":"Abigail A. Sommer, Yael Vodovotz","doi":"10.1002/aocs.12975","DOIUrl":"10.1002/aocs.12975","url":null,"abstract":"<p>Omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are imperative for general biological functions and may be involved in the prevention and treatment of various diseases. Despite the benefits, US consumption of fish, and consequently EPA and DHA, is below recommended levels. Developing an alternative food product which contains EPA and DHA is a strategy to increase consumption. In this study, 1% fish oil (FO) was emulsified and incorporated into plant-based milk beverages and compared to 1% high-oleic sunflower oil (HOS) controls. The HOS and FO beverages were analyzed for their physicochemical stability, comparing three different beverage bases: soy, oat, and almond, and water. It was found that oat and almond milk were the most physically stable to emulsion separation and sedimentation, and there were no differences between control sunflower oil and fish oil. Soy and oat milk with fish oil were most resistant to oxidation compared to other fish oil-fortified beverages. Following the physicochemical study, the consumer rejection threshold of FO in the three plant milk beverages was investigated. Generally, 0.2% of fish oil could be added to oat and soy milk without causing consumer rejection, containing approximately 360 mg of combined EPA and DHA per 240 mL serving. Almond milk was found to be a poor vehicle for fish oil, as any concentration led to rejection. This study provides valuable preliminary data to support fortifying oat or soy milk with EPA and DHA to increase intake; however, further optimization of beverage functional characteristics and flavor is needed.</p>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1399-1411"},"PeriodicalIF":2.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aocs.onlinelibrary.wiley.com/doi/epdf/10.1002/aocs.12975","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of Biophenol-Derived Biolubricants With Enhanced Antioxidant Properties 具有增强抗氧化性能的生物酚类生物润滑剂的合成

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-06-29 DOI: 10.1002/aocs.12963

Zichen Shang, Jingzhou Liu, Sifan Jiang, Keyi Bao, Zeni Zheng, Sheng Han, Jincan Yan

{"title":"Synthesis of Biophenol-Derived Biolubricants With Enhanced Antioxidant Properties","authors":"Zichen Shang, Jingzhou Liu, Sifan Jiang, Keyi Bao, Zeni Zheng, Sheng Han, Jincan Yan","doi":"10.1002/aocs.12963","DOIUrl":"10.1002/aocs.12963","url":null,"abstract":"<div>\u0000 \u0000 <p>The main challenge to the use of vegetable oils as green lubricants is their oxidative stability. In this work, biolubricants with efficient antioxidant properties have been specifically designed and synthesized with the aim of maximizing the oxidative stability of vegetable oils by combining biophenols (p-coumaric, ferulic, and sinapic acids) with epoxidized ring-opened soybean oil in a single molecule. The synthetic products were named OIS-ESO-PCA (epoxidized ring-opened soybean oil grafted with p-coumaric acid), OIS-ESO-FA (epoxidized ring-opened soybean oil grafted with ferulic acid), and OIS-ESO-SA (epoxidized ring-opened soybean oil grafted with sinapic acid), respectively. Biophenols improve biolubricant antioxidant properties, addressing energy, and environmental challenges. The modified samples were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). The free radical scavenging activity of the oil samples was evaluated using the DPPH (1,1-diphenyl-2-trinitrophenylhydrazine) method and was found to be much higher than that of the soybean oil (SBO). The oxidation resistance and thermo-oxidative stability of the oil samples were evaluated based on pressure differential scanning calorimetry (PDSC), rotary bomb oxidation test (RBOT), and thermogravimetry (TGA). Compared with SBO, the oxidative induction time of OIS-ESO-PCA, OIS-ESO-FA, and OIS-ESO-SA increased by 118%, 296%, and 384%. The modified oils showed excellent antioxidant properties compared to the SBO. Therefore, biophenolic acid can be effectively used to improve the antioxidant properties of vegetable oils.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1389-1398"},"PeriodicalIF":2.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and Characterization of Eco-Friendly Lubricants Exploring Epoxides and Polyol-Esters Derived From Madhuca indica Seed Oil 环保润滑油的合成与表征——从蓖麻籽油中提取环氧化合物和多元醇酯

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-06-29 DOI: 10.1002/aocs.12971

Pranav Prasannakumar, Sabarinath Sankarannair, Vinod V. T. Padil, Vighnesh Raj, Jyothi Sivasankarannair, Ragavanantham Shanmugam, Allu Nikhith

{"title":"Synthesis and Characterization of Eco-Friendly Lubricants Exploring Epoxides and Polyol-Esters Derived From Madhuca indica Seed Oil","authors":"Pranav Prasannakumar, Sabarinath Sankarannair, Vinod V. T. Padil, Vighnesh Raj, Jyothi Sivasankarannair, Ragavanantham Shanmugam, Allu Nikhith","doi":"10.1002/aocs.12971","DOIUrl":"10.1002/aocs.12971","url":null,"abstract":"<div>\u0000 \u0000 <p>Petroleum-based lubricants commonly used in machinery pose environmental risks due to their non-biodegradable and non-renewable nature. Switching to sustainable alternatives based on non-edible oils instead of conventional lubricants is a viable approach to mitigate environmental conflicts. The present study aims to assess the suitability of \u0000 <i>Madhuca indica</i>\u0000 seed oil (Mahua oil) as a feedstock for environmentally friendly lubricants. Chemical modifications, specifically transesterification and epoxidation, were conducted on Mahua oil, and its lubricant properties were compared with that of a commercial lubricant. The study covers various aspects such as physicochemical, thermal, oxidative, rheological, and tribological properties. SiO<sub>2</sub> nanoparticles are also incorporated into the oil samples to study the resulting changes in tribological properties. Results show significant improvements in chemical stability and performance: acid and peroxide values decreased considerably post-modification, and epoxidized Mahua oil (EMO) demonstrated superior thermal stability and tribological performance. With nanoparticle addition, the coefficient of friction (COF) and wear scar diameter (WSD) were reduced by 39.1% and 8.87%, respectively, indicating enhanced lubrication compared to unmodified Mahua oil. Both modified oils exhibited higher viscosity indices than the commercial fluid. These findings highlight that Epoxidation is more advantageous for chemically modifying vegetable oils, while transesterification proves particularly effective with oils high in free fatty acids. The resulting chemically modified Mahua oils show promising potential as alternatives to their petroleum-based counterparts.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1373-1387"},"PeriodicalIF":2.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features of the Fatty Acid Methyl Esters' Hydroperoxides Formation and Decomposition Processes 脂肪酸甲酯氢过氧化物形成与分解过程特征

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-06-29 DOI: 10.1002/aocs.12972

E. A. Savel'ev, A. D. Cherepanova, V. N. Sapunov

{"title":"Features of the Fatty Acid Methyl Esters' Hydroperoxides Formation and Decomposition Processes","authors":"E. A. Savel'ev, A. D. Cherepanova, V. N. Sapunov","doi":"10.1002/aocs.12972","DOIUrl":"10.1002/aocs.12972","url":null,"abstract":"<div>\u0000 \u0000 <p>The present work is devoted to studying the regularities of synthesis and decomposition of hydroperoxides of methyl esters of fatty acids. Fatty acid methyl esters of sunflower oil were used as raw material. In the case of non-catalytic oxidation at 70°C, the maximum concentration of hydroperoxides is observed (~45 wt.%), but 14 h of synthesis are required to achieve it. The use of N-hydroxyphthalimide as a catalyst makes it possible to reduce the reaction time to 8 h without affecting the yield of hydroperoxides. In turn, the results of studying the decomposition of hydroperoxides in the temperature range of 90°C–170°C demonstrate the presence of an unusual temperature dependence of the process activation energy. Upon passing to elevated temperatures, from approximately 120°C, a decrease in the activation energy of the process is observed from 83.6 to 35.8 kJ/mol, which means the transition of the process to the region of entropy control, in which the decomposition of hydroperoxides is preceded by the formation of hydrogen bonds of hydroperoxide molecules with each other and/or with other components of the reaction mixture.</p>\u0000 </div>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1363-1372"},"PeriodicalIF":2.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Methods for the Preparation of Fatty Acid Methyl Esters for the Analysis of Omega-3 Rich Oils by Gas Chromatography 气相色谱法分析富欧米茄-3油中脂肪酸甲酯制备方法的比较

IF 2.4 4区农林科学

Journal of the American Oil Chemists Society Pub Date : 2025-06-28 DOI: 10.1002/aocs.12974

Tharani T. Dissanayake, Shona Crawford-Clark, Benjamin J. Bowen, Luke C. Henderson, Colin J. Barrow, Jacqui L. Adcock

{"title":"Comparison of Methods for the Preparation of Fatty Acid Methyl Esters for the Analysis of Omega-3 Rich Oils by Gas Chromatography","authors":"Tharani T. Dissanayake, Shona Crawford-Clark, Benjamin J. Bowen, Luke C. Henderson, Colin J. Barrow, Jacqui L. Adcock","doi":"10.1002/aocs.12974","DOIUrl":"10.1002/aocs.12974","url":null,"abstract":"<p>Fatty acid analysis is required in a wide range of industries, and conversion to fatty acid methyl esters followed by gas chromatography is by far the most common method of analysis. However, despite widespread use, there is no consensus on which derivatization method should be used or how the methods compare. In this work, five methods for the preparation of fatty acid methyl esters were compared for the analysis of three omega-3 rich oils (marine, krill, and flaxseed oils). Overall, we found that all methods gave similar results for percentage composition of fatty acids, but some variation existed when comparing absolute quantitation of fatty acids. We also found that the derivatization efficacy of each method varied depending on lipid class, with catalyst type having a significant effect. Two methods employing: (i) methanolic hydrogen chloride and (ii) methanolic sodium hydroxide followed by a boron trihalide reagent (BCl<sub>3</sub> or BF<sub>3</sub>) had derivatizing efficacies (by lipid class) that were significantly higher than for the other methods.</p>","PeriodicalId":17182,"journal":{"name":"Journal of the American Oil Chemists Society","volume":"102 9","pages":"1351-1361"},"PeriodicalIF":2.4,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aocs.onlinelibrary.wiley.com/doi/epdf/10.1002/aocs.12974","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0