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EXTRACTION AND EVALUATION OF EDIBLE OIL FROM SCHIZOCHYTRIUM SP. USING AN AQUEOUS ENZYMATIC METHOD

《农业科学与工程前沿（英文）》 2021年 第8卷 第4期   页码 623-634 doi: 10.15302/J-FASE -2021400

摘要：

Schizochytrium sp., a marine microalga, is a potential source of edible oil due to its short growth cycle and rapid lipid accumulation, especially of docosahexaenoic acid. An approach to isolate edible microalgal oil from Schizochytrium sp. using aqueous enzymatic extraction (AEE) was developed. Parameters were optimized by single-factor experiments followed by Box-Behnken design. Proteases were effective in extracting oil. The maximum free oil recovery (49.7%±0.58%) and total oil recovery (68.1%±0.94%) were obtained under optimum conditions of liquid-to-solid ratio of 4.8:1, a 2.5% enzyme concentration of papain and an extraction time of 2.2 h. There was a significant difference (P<0.05) in polyunsaturated fatty acid composition between microalgal oil obtained by AEE and by Soxhlet extraction, with the former having superior physiochemical properties and higher concentrations of bioactive components including total phenolic compounds and total tocopherols. These findings indicate a potential application of AEE for extraction of oil from Schizochytrium sp.

 

关键词： antioxidant activity / aqueous enzymatic extraction / edible microalgal oil / fatty acid composition / physicochemical properties    

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Potential hybrid feedstock for biodiesel production in the tropics

Solomon GIWA,Oludaisi ADEKOMAYA,Collins NWAOKOCHA

《能源前沿（英文）》 2016年 第10卷 第3期   页码 329-336 doi: 10.1007/s11708-016-0408-8

摘要： Recently, mixture of different oils at various proportions have been used as feedstock for biodiesel production. The primary aim is to improve fuel properties which are strongly influenced by the fatty acid composition of the individual oil that makes up the feedstock mix. The tropics are renowned for abundant oil-bearing crops of which palm kernel oil (PKO) from palm seed and groundnut oil (GNO) are prominent. This present paper investigated biodiesel production from hybrid oil (HO) of PKO (medium carbon chain and highly saturated oil) and GNO (long carbon chain and highly unsaturated oil) at 50/50 (v/v) blending. The principal fatty acids (FAs) in the HO are oleic (35.62%) and lauric acids (24.23%) with 47.80% of saturated FA and 52.26% of unsaturated FA contents. The chemical conversion of the oil to methyl ester (ME) gave 86.56% yield. Fuel properties of hybrid oil methyl ester (the HOME) were determined in accordance with standard test methods and were found to comply with both ASTM D6751 and EN 14214 standards. The oxidative stability, cetane number and kinematic viscosity (KV) of HOME were observed to be improved when compared with those of GNO methyl ester from single parent oil, which could be accredited to the improved FA composition of the HO. The KV (3.69 mm /s) of HOME obtained in this paper was remarkably low compared with those reported in literature for most biodiesels. This value suggests better flow, atomization, spray and combustion of this fuel. Conclusively, the binary blend of oils can be a viable option to improve the fuel properties of biodiesel feedstock coupled with reduced cost.

关键词： groundnut oil     palm kernel oil     methyl ester     fuel properties     tropics     fatty acid composition    

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解淀粉芽孢杆菌发酵红小豆的理化特性和生物活性 Article

吴珊, 卢帅, 刘军, 杨绍青, 闫巧娟, 江正强

《工程（英文）》 2021年 第7卷 第2期   页码 219-225 doi: 10.1016/j.eng.2020.10.010

摘要：

本研究采用解淀粉芽孢杆菌发酵红小豆（Vigna umbellata）,并评价了发酵红小豆的理化特性和生物活性。以纤溶酶活性为指标优化了发酵条件，在最适发酵条件下，纤溶酶活性最高达78.0 FU∙g-1（4890 IU∙g-1，纤维蛋白平板法）。发酵红小豆中多肽含量（2.1~10.9 g∙100 g-1）、总酚含量（116.7~388.5 mg没食子酸∙100 g-1）、总黄酮含量（235.5~354.3 mg芦丁∙100 g-1）、花青素含量（20.1~47.1 mg∙100 g-1）和超氧化物歧化酶活性（55.3~263.6 U∙g-1）显著增加。红小豆经发酵后的2,2-二苯基-1-苦肼基（DPPH）和2,2-联氮双（3-乙基苯并噻唑啉-6-磺酸）二铵盐（ABTS）自由基清除活性和铁离子还原抗氧化能力（FRAP）较未发酵的红小豆提高1.9~4.8倍。此外，发酵红小豆的二肽基肽酶Ⅳ（DPP-Ⅳ）抑制活性、α-葡萄糖苷酶抑制活性和抗凝血活性显著提高。解淀粉芽孢杆菌发酵红小豆具有多种功能活性，对开发预防血栓性疾病的功能食品具有重要意义。

关键词： 固态发酵     红小豆     解淀粉芽孢杆菌     抗血栓活性     抗氧化活性     降血糖活性    

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Mapping the structure-activity relationship of

Worawan PANPIPAT, Hasene KESKIN, Zheng GUO

《化学科学与工程前沿（英文）》 2015年 第9卷 第1期   页码 105-113 doi: 10.1007/s11705-015-1502-x

摘要： The phase behavior of twelve synthesized -sitosteryl fatty acid esters with acyl moieties with different chain lengths (C2:0-C18:0) and different degrees of unsaturation (C18:1-C18:3) were investigated in pure and mixed Langmuir monolayers with phospholipids. The surface-pressure isotherms showed that short chain -sitosteryl fatty acid esters gave smaller mean molecular areas and had decreased monolayer stability and the long chain steryl esters did not produce collapsed plateaus. All the steryl esters displayed strong condensing effects, but there was a pronounced structural dependency: medium chain esters (C8 and C10) were less efficient than short and long chain esters. Atomic force microscopy imaging demonstrated that monolayers mixed with dipalmitoyl phosphatidylcholine (DPPC) displayed both DPPC-rich and steryl lipid-rich domains. However, the height and area differences between the two phases and the roughness and morphologic patterns were very dependent on the steryl lipid concentrations as well as the length, the degree of unsaturation and the molecular conformations of the acyl segments. These findings not only provide a better understanding of the interactions between phytosteryl hydrophobic derivatives and biomembranes, but also may be of general use for the design and engineering of phytosterol structural derivations for specific food and pharmaceutical applications.

关键词： β-sitosteryl fatty acid esters     dipalmitoyl phosphatidylcholine     Langmuir monolayer     condensing effect     structure-activity relationship    

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Antibacterial properties of extracts of

Manhong YE,Lei ZHANG,Jiaqi GE,Haifeng SUN,Jingjing NI,Shengmei YANG,Wanhong WEI

《农业科学与工程前沿（英文）》 2015年 第2卷 第4期   页码 327-334 doi: 10.15302/J-FASE-2015078

摘要： Canadian goldenrod ( ) is one of the most destructive invasive weeds in South-eastern China. To evaluate its potential application as dietary supplement in red swamp crayfish ( ), the antibacterial properties of aqueous and ethanol extracts of this plant against three major pathogenic bacteria in crayfish aquaculture were examined. Inhibition zone tests and determination of minimum inhibitory concentration revealed that the extracts had lower antibacterial activity than extracts from two traditional medicinal plants that possess antibacterial properties, garlic ( ) and cortex phellodendri ( ). However, they did exhibit greater antibacterial effects than extracts from another widely used medicinal plant, , and an aquatic weed, . Aqueous extracts of Canadian goldenrod gave greater inhibition than the ethanol extracts. Crayfish fed a diet with 2% these aqueous extracts exhibited significantly higher enzyme activity of alkaline phosphatase, catalase and phenoloxidase ( <0.05). Based on the results of this study, we conclude that aqueous extracts of Canadian goldenrod are highly promising for the development of new dietary supplement for use in crayfish aquaculture.

关键词： antibacterial activity     Canadian goldenrod     antioxidant enzyme     crayfish    

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高油酸油菜中甘油三酯的组成及结构研究 Artical

官梅,陈洪,熊兴华,吕昕,李栒,黄凤洪,官春云

《工程（英文）》 2016年 第2卷 第2期   页码 258-262 doi: 10.1016/J.ENG.2016.02.004

摘要：

植物油中甘油三酯(TAG)的脂肪酸组成及其在甘油主链上的位置决定了植物油脂的营养价值。本研究采用气相色谱法(GC)和高效液相色谱– 串联质谱联用(HPLC-MS/MS)分析了不同油酸含量的甘蓝型油菜籽油的甘油三酯的脂肪酸组成和结构。结果表明：高油酸油菜籽油的油酸含量为80%左右。TAG酰基总碳数(CN值)为54的甘油三酯的相对含量占80%以上。主要的甘油三酯为OOO，相对含量最高达71.75%，其次是OOL 7.56%、OOLn 4.81%和SOO 4.74%。在高油酸的品种中油酸主要集中在甘油三酯上的sn-2位，而在高芥酸品种中，油酸主要集中在甘油三酯上的sn-1/3位置。结果表明，高油酸油菜籽油是一种具有极高营养价值的植物油。

关键词： 油菜     脂肪酸     甘油三酯     位置异构体    

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Insights into the changes of amino acids, microbial community, and enzymatic activities related with

《环境科学与工程前沿（英文）》 2023年 第17卷 第3期 doi: 10.1007/s11783-023-1635-y

摘要：

● The highest seed germination index was achieved at 0.3 g/g total solids of food waste.

关键词： Composting     Food waste     Amino acids     Microbial community     Enzymatic activity     Nutrient quality    

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Prediction of selected biodiesel fuel properties using artificial neural network

Solomon O. GIWA,Sunday O. ADEKOMAYA,Kayode O. ADAMA,Moruf O. MUKAILA

《能源前沿（英文）》 2015年 第9卷 第4期   页码 433-445 doi: 10.1007/s11708-015-0383-5

摘要： Biodiesel is an alternative fuel to replace fossil-based diesel fuel. It has fuel properties similar to diesel which are generally determined experimentally. The experimental determination of various properties of biodiesel is costly, time consuming and a tedious process. To solve these problems, artificial neural network (ANN) has been considered as a vital tool for estimating the fuel properties of biodiesel, especially from its fatty acid (FA) composition. In this study, four ANNs have been designed and trained to predict the cetane number (CN), flash point (FP), kinematic viscosity (KV) and density of biodiesel using ANN with logsig and purelin transfer functions in the hidden layer of all the networks. The five most prevalent FAs from 55 feedstocks found in the literature utilized as the input parameters for the model are palmitic, stearic, oleic, linoleic and linolenic acids except for density network with a sixth parameter (temperature). Other FAs that are present in the biodiesels have been considered based on the number of carbon atom chains and the level of saturation. From this study, the prediction accuracy and the average absolute deviation of the networks are CN (96.69%; 1.637%), KV (95.80%; 1.638%), FP (99.07%; 0.997%) and density (99.40%; 0.101%). These values are reasonably better compared to previous studies on empirical correlations and ANN predictions of these fuel properties found in literature. Hence, the present study demonstrates the ability of ANN model to predict fuel properties of biodiesel with high accuracy.

关键词： biodiesel     fuel properties     artificial neural network     fatty acid     prediction    

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Identification of Legionella species by the composition of cellular fatty acids

Cun-Lei FANG MD, Zhao-Hui HU PhD, Qing-Yi ZHU MD, Ya-Jun SONG PhD, Ya-Fang TAN PhD, Rui-Fu YANG PhD,

《医学前沿（英文）》 2010年 第4卷 第2期   页码 208-215 doi: 10.1007/s11684-010-0031-8

摘要： One hundred and fifty-three isolates from the environment and 36 reference strains of the were studied with regards to their composition of cellular fatty acids as determined by gas chromatography, and then were classified into 41 groups by numerical analysis. Most reference strains formed only a single group, except , , , , and , which were clustered into two or three groups. Even serological types of could be clearly identified. Therefore, in this study, numerical analysis of cellular fatty acid composition is an effective method for identifying species.

关键词： Legionella     numerical analysis     identification     fatty acids composition    

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中国食用油安全战略转变：国内条件与国际情景

马文杰

《中国工程科学》 2016年 第18卷 第1期   页码 42-47 doi: 10.15302/J-SSCAE-2016.01.006

摘要：

食用油料成为我国对国际市场依存度最大的大宗农产品，是造成农产品国际贸易逆差的主要成因。国产植物油料的大量进口对国家粮食与食物安全、居民消费甚至国民经济均产生较为重要的影响。在新的粮食安全战略下，我国食用油作物面积增长空间有限、兼用油源生产潜力巨大，但转化为现实产量困难重重，未来消费量将进一步增加。在国产植物油料大量进口新常态下，世界食用油生产潜力巨大、我国具有从世界市场稳定获取食用油料的能力、食用油料供给安全外部环境复杂。针对新的国内条件与国际情景，论文给出我国新的食用油安全战略：维持能力、保留基准、积极进口、健康消费。

关键词： 食用油     国内条件     国际情景     生产潜力     战略转变    

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Optimization of pretreatment of Jatropha oil with high free fatty acids for biodiesel production

Supriyono SUWITO, Giuliano DRAGONE, Hary SULISTYO, Bardi MURACHMAN, Suryo PURWONO, José TEIXEIRA

《化学科学与工程前沿（英文）》 2012年 第6卷 第2期   页码 210-215 doi: 10.1007/s11705-012-1282-5

摘要： A central composite rotatable design and response surface methodology were used in order to investigate the individual and combined effects of the ethanol-to-oil ratio, H SO concentration, temperature and time of reaction on the reduction of free fatty acid (FFA) in jatropha oil. A quadratic polynomial model relating the reaction variables with FFA reduction was developed, presenting a good coefficient of determination ( = 0.893). For reducing FFA to less than 1%, the optimal combination was found to be 0.62 v·v ethanol-to-oil ratio (14.9 v·v ethanol-to-FFA ratio), 1.7% v·v H SO concentration, and 79 min reaction time at a reaction temperature of 54°C. These results are of great relevance to maximize methyl esters formation by transesterification using an alkaline catalyst.

关键词： biodiesel     biofuel     esterification     free fatty acids     jatropha curcas oil    

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Covalent triazine framework with efficient photocatalytic activity in aqueous and solid media

Cyrine Ayed, Wei Huang, Kai A. I. Zhang

《化学科学与工程前沿（英文）》 2020年 第14卷 第3期   页码 397-404 doi: 10.1007/s11705-019-1884-2

摘要： Covalent triazine frameworks (CTFs) have been recently employed for visible light-driven photocatalysis due to their unique optical and electronic properties. However, the usually highly hydrophobic nature of CTFs, which originates from their overall aromatic backbone, leads to limitations of CTFs for applications in aqueous media. In this study, we aim to extend the range of the application media of CTFs and design hybrid material of a CTF and mesoporous silica (SBA-15) for efficient photocatalysis in aqueous medium. A thiophene-containing CTF was directly synthesized in mesopores of SBA-15. Due to the high surface area and the added hydrophilic properties by silica, the hybrid material demonstrated excellent adsorption of organic molecules in water. This leads not only to high photocatalytic performance of the hybrid material for the degradation of organic dyes in water, but also for efficient photocatalysis in solvent-free and solid state. Furthermore, the reusability, stability and easy recovery of the hybrid material offers promising metal-free heterogeneous photocatalyst for broader applications in different reaction media.

关键词： photocatalysis     covalent triazine framework     aqueous medium     SBA-15     solid state    

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Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration

Jianxian ZENG, Junfeng LIU, Niandong HUANG,

《化学科学与工程前沿（英文）》 2010年 第4卷 第3期   页码 360-366 doi: 10.1007/s11705-009-0269-3

摘要： The extraction of cobalt ions from dilute aqueous solutions was investigated by ultrafiltration with the help of poly(acrylic acid) sodium salt (PAASS). Polysulfone and polyethersulfone hollow fiber ultrafiltration membranes were employed in this process. The kinetics of complexation reaction was studied for PAASS with Co. Results showed that, under a large excess of PAASS, it takes 65, 55 and 40 min at pH 5, 6 and 7, respectively, to get the equilibrium of complexation. The reaction kinetics can be described by a pseudo-first-order equation. Then, the effects of various parameters on the extraction of Co were examined in detail. Results indicated that loading ratio, pH value and low-molecular competitive complexing agent affect significantly cobalt rejection coefficient . Furthermore, a concentration experiment was carried out at pH 7. With increasing volume concentration factor, membrane flux declines slowly, and value is always about 1. The concentrated retentate was used further for a decomplexation experiment. The decomplexation ratio of cobalt-PAASS complex reaches as high as 90.1%. After the decomplexation step, a diafiltration experiment was performed at pH 2.5. Cobalt ions can be extracted satisfactorily from the retentate, and a purified PAASS is obtained.
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Cultivars and oil extraction techniques affect Cd/Pb contents and health risks in oil of rapeseed grown

《环境科学与工程前沿（英文）》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1687-z

摘要：

● Organic solvent extracted fewer Cd/Pb in rapeseed oil than physical pressing.

关键词： Rapeseed oil     Oil extraction technologies     Human health risk assessment     Cd/Pb-contaminated farmland     Substitute planting    

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Complexation of iron by salicylic acid and its effect on atrazine photodegradation in aqueous solution

Xiaoxia OU, Chong WANG, Fengjie ZHANG, Yan MA, He LIU, Xie QUAN,

《环境科学与工程前沿（英文）》 2010年 第4卷 第2期   页码 157-163 doi: 10.1007/s11783-010-0018-3

摘要： The photodegradation of atrazine and the photochemical formation of Fe(II) and HO in aqueous solutions containing salicylic acid and Fe(III) were studied under simulated sunlight irradiation. Atrazine photolysis followed first-order reaction kinetics, and the rate constant () corresponding to the solution of Fe(III)-salicylic acid complex (Fe(III)-SA) was only 0.0153 h, roughly one eighth of the observed in the Fe(III) alone solution (0.115 h). Compared with Fe(III) solution, the presence of€ salicylic€ acid€ significantly€ enhanced€ the€ formation€ of Fe(II) but greatly decreased HO generation, and their subsequent product, hydroxyl radical (OH), was much less, accounting for the low rate of atrazine photodegradation in Fe(III)-SA solution. The interaction of Fe(III) with salicylic acid was analyzed using Fourier-transform infrared (FTIR) spectroscopy and UV-visible absorption, indicating that Fe(III)-salicylic acid complex could be formed by ligand exchange between the hydrogen ions in salicylic acid and Fe(III) ions.

关键词： salicylic acid     iron     atrazine     photodegradation    

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标题 作者 时间 类型 操作

EXTRACTION AND EVALUATION OF EDIBLE OIL FROM SCHIZOCHYTRIUM SP. USING AN AQUEOUS ENZYMATIC METHOD

期刊论文

Potential hybrid feedstock for biodiesel production in the tropics

Solomon GIWA,Oludaisi ADEKOMAYA,Collins NWAOKOCHA

期刊论文

解淀粉芽孢杆菌发酵红小豆的理化特性和生物活性

吴珊, 卢帅, 刘军, 杨绍青, 闫巧娟, 江正强

期刊论文

Mapping the structure-activity relationship of

Worawan PANPIPAT, Hasene KESKIN, Zheng GUO

期刊论文

Antibacterial properties of extracts of

Manhong YE,Lei ZHANG,Jiaqi GE,Haifeng SUN,Jingjing NI,Shengmei YANG,Wanhong WEI

期刊论文

高油酸油菜中甘油三酯的组成及结构研究

官梅,陈洪,熊兴华,吕昕,李栒,黄凤洪,官春云

期刊论文

Insights into the changes of amino acids, microbial community, and enzymatic activities related with

期刊论文

Prediction of selected biodiesel fuel properties using artificial neural network

Solomon O. GIWA,Sunday O. ADEKOMAYA,Kayode O. ADAMA,Moruf O. MUKAILA

期刊论文

Identification of Legionella species by the composition of cellular fatty acids

Cun-Lei FANG MD, Zhao-Hui HU PhD, Qing-Yi ZHU MD, Ya-Jun SONG PhD, Ya-Fang TAN PhD, Rui-Fu YANG PhD,

期刊论文

中国食用油安全战略转变：国内条件与国际情景

马文杰

期刊论文

Optimization of pretreatment of Jatropha oil with high free fatty acids for biodiesel production

Supriyono SUWITO, Giuliano DRAGONE, Hary SULISTYO, Bardi MURACHMAN, Suryo PURWONO, José TEIXEIRA

期刊论文

Covalent triazine framework with efficient photocatalytic activity in aqueous and solid media

Cyrine Ayed, Wei Huang, Kai A. I. Zhang

期刊论文

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration

Jianxian ZENG, Junfeng LIU, Niandong HUANG,

期刊论文

Cultivars and oil extraction techniques affect Cd/Pb contents and health risks in oil of rapeseed grown

期刊论文

Complexation of iron by salicylic acid and its effect on atrazine photodegradation in aqueous solution

Xiaoxia OU, Chong WANG, Fengjie ZHANG, Yan MA, He LIU, Xie QUAN,

期刊论文