共查询到19条相似文献,搜索用时 156 毫秒
1.
超临界CO2萃取技术在天然香料领域的应用越来越广泛。本文按香料植物器官分类,对超临界CO2萃取技术在天然植物香料提取方面的最新应用研究进行了总结,同时对超临界CO2萃取的技术特点和工业化前景进行了分析和展望。 相似文献
2.
超临界流体萃取技术是现代食品加工中天然产物得以分离的高新分离技术之一。介绍了超临界流体萃取技术的发展史和我国的发展现状,阐述了超临界流体萃取技术的基本原理和技术特点,提出了目前超临界流体萃取技术应用于食品加工中存在的问题及解决途径,并综述了超临界流体萃取技术在食品加工中的应用。重点介绍了超临界CO2 萃取技术在提取天然产物中的生理活性物质方面的一些研究热点。 相似文献
3.
综述了超临界流体技术在天然色素萃取中的应用现状,对超临界CO2萃取不同种类色素的可行性、萃取理论和研究成果等方面进行了总结。探讨了超临界CO2在天然色素萃取方面存在的不足和需要解决的问题。 相似文献
4.
本文介绍了超临界萃取技术在食用天然色素研发中的应用现状,对近十年来超临界CO2萃取天然色素的研究报告做了统计,重点介绍了辣椒红素、胡萝卜素、番茄红素、玉米黄色素等超临界CO2萃取技术的研究进展. 相似文献
5.
本文介绍了超临界萃取技术在食用天然色素研发中的应用现状,对近十年来超临界CO2萃取天然色素的研究报告作了统计,重点介绍了的辣椒红素、胡萝卜素、蕃茄红素、玉米黄色素等超临界CO2萃取技术的研究进展。 相似文献
6.
本文概述了超临界萃取技术,介绍了超临界CO_2萃取技术在天然产物分离提取上的研究与应用进展。 相似文献
7.
超临界CO2萃取具备高效、节能、清洁、操作条件温和等优点,受到越来越多的关注,正逐渐成为取代传统溶剂法提取活性物质的绿色工艺之一。为了进一步了解超临界CO2萃取技术的应用现状,该文介绍了超临界流体萃取(SFE)技术的原理,依据提取天然产物的类型综述了该技术在植物精油、天然色素、生物碱提取中的应用,与传统溶剂方法相比所具有的优势,并展望了其工业化应用前景,为超临界CO2萃取技术在天然产物中的应用提供参考和借鉴。 相似文献
8.
本文主要介绍了超临界萃取技术在粮油工业中的应用情况,包括超临界萃取技术在油脂提取、磷脂的分离、不饱和脂肪酸分离、油脂精炼、天然色素提取、天然抗氧化剂提取、甾醇提取等中的应用。 相似文献
9.
本文重点综述了超临界流体技术在萃取天然色素中的应用成果,首次以天然色素的分类作为切入点,采研究超临界二氧化碳萃取不同种类色素的可行性,就其萃取理论和研究成果等方面进行了总结.最后探讨了超临界C02在萃取天然色素方面存在的不足之处和尚需解决的问题. 相似文献
10.
超临界流体萃取(SFE)技术开辟了分离工业的新领域,是一种新型的分离技术.本文对超临界萃取的基本原理进行了阐述,介绍了超临界萃取的特点及其在天然香料工业、食品和天然中草药等方面的应用和研究进展,并对今后的发展趋势进行了展望. 相似文献
11.
Volatile components of marjoram ( Origanum majorana L.) essential oil obtained by hydrodistillation and extracts obtained by solvent extraction with ethyl alcohol and supercritical fluid extraction (SFE) were investigated. The compositions of volatile compounds in essential oil, ethanolic and SFE extracts were determined by GC and GC–MS. The antimicrobial properties of marjoram solvent extracts were investigated with microbiological tests against food borne fungi and bacteria strains. Extracts obtained by SFE at high pressure and temperature showed significantly stronger antimicrobial properties in comparison to the slight inhibitory effects of the ethanolic extract. The results support the notion that extracts obtained by SFE might have a role as flavourings and natural colourants as well as use as preservatives in food and cosmetic systems. 相似文献
12.
超临界流体萃取(Supercriticalfluidextraction,SFE)是一种新型的萃取分离技术,随着对超临界萃取技术研究的不断深入,人们对夹带剂的研究也陆续开展起来。论述超临界流体及超临界萃取中夹带剂的作用、作用机理、选择方法、应用及其研究进展,并提出所存在的问题和研究方向。 相似文献
13.
研究以小麦胚芽为试验材料 ,利用超临界流体萃取技术从麦胚中提取了天然维生素E。结果表明 :麦胚中天然维生素E的超临界CO2 适宜萃取条件为萃取压力 2 8~ 35MPa、萃取温度 40~ 45℃、CO2 流量 2mL/min、萃取时间 90min。 相似文献
14.
The chemical profiles of bioactive essential oil and extracts obtained by hydrodistillation (HD) and supercritical fluid extraction (SFE), respectively, from Lavandula viridis were compared. The SFE was performed at 40 °C and at extraction pressures of 12 or 18 MPa in two different separators. Evaluation of the essential oil and SFE extracts by GC–FID and GC–IT–MS revealed that oxygen-containing monoterpenes were the major constituents in both cases, but there were important differences between the chemical profiles produced by the different extraction techniques. More compounds were isolated by HD but higher yields were achieved by SFE. Camphor was the main component identified in the essential oil (31.59 ± 1.32%), and in extracts from the first (1.61 ± 0.34%) and second SFE separators (22.48 ± 1.49%) at 12 MPa. In contrast, the first separator SFE extract at 18 MPa (heavy compounds) was dominated by myrtenol (5.38 ± 2.04%) and camphor (4.81 ± 1.93%), whereas the second separator SFE extract (volatiles) was dominated by verbenone (13.97 ± 5.27%). The essential oil and heavy compound extracts from the first separator possessed antioxidant and anti-cholinesterase activities. Our data show that phytochemicals from the aerial parts of L. viridis could be developed as natural antioxidant and anti-cholinesterase drugs, with particular applications in the symptomatic treatment of Alzheimer’s disease. 相似文献
15.
ABSTRACT This study is aimed to evaluate the antimicrobial and antioxidant activities of two extracts of emblica (Phyllanthus emblica L.) obtained by supercritical fluid extraction (SFE) and methanol extraction. The SFE extract showed strong antimicrobial activity against all microorganisms tested, whereas the methanolic extract showed low activity against Staphylococcus aureus and fungi. In contrast, the methanolic extract exhibited significantly higher antioxidant activity than the SFE extract. The SFE extract was analyzed by gas chromatography with mass spectrometric detector. Thirty compounds were tentatively identified, representing 99.67% of the volatile components. β‐Bourbonene, teracosane, palmitic acid, thymol, β‐caryophyllene and undecane were the major compounds. The methanolic extract was subjected to separation and purification using reverse‐phase high‐performance liquid chromatography. Kaempferol 3‐β‐D‐glucopyranoside (1), kaempferol (2), quercetin (3), isocorilagin (4) and geraniin (5) respectively, were identified by spectral methods, 1H and 13C nuclear magnetic resonance spectroscopy, ultraviolet‐visible spectrophotometry and mass spectroscopy, and comparison with literatures. PRACTICAL APPLICATIONS The study can be considered as the first report on the in vitro antimicrobial and antioxidant properties of supercritical fluid extraction (SFE) and methanolic extracts prepared from Phyllanthus emblica. The results introduce a unique natural source that possesses strong antimicrobial and antioxidant substances. The SFE extract had a strong and broad spectrum of antimicrobial activity, and in some cases, even found to have similar activity to the antibiotics ampicillin and nystatin. On the other hand, the methanolic extract exhibited quite strong antioxidant activities, which were found to be similar, and in some cases even higher than the reference compound butylated hydroxytoluene (BHT). Hence, the extracts of P. emblica could be used as a natural preservative ingredient in food and/or pharmaceutical industry. 相似文献
16.
Mint ( Mentha spicata L.) is a European aromatic plant, with its essential oil used in food, pharmaceutical and cosmetic industries. Supercritical
fluid extraction (SFE) is important for natural products, because it is residue free and preserves thermolabile compounds
and product characteristics. The aim of this work was to obtain mint essential oil by sub-/supercritical extraction, with
and without modifier and in different operational conditions, by hydro-distillation and by Soxhlet with different solvents.
The results indicated the SFE highest yield (2.38% w/ w) was obtained at 50 °C and 300 bar, with the crossover of yield isotherms occurring between 140 and 170 bar. When using a
cosolvent for SFE, the ethanol showed the highest yield, compared to ethyl acetate. The mint essential oil was rich in compounds
with therapeutic activities and several substances of industrial interest, such as carvone, cineol, and pulegone, presenting
also good antioxidant activity performance. 相似文献
17.
改进了HPLC一量测定姜中姜辣素含量的方法,并用该法比较分析了乙醇循环法(E.E)和超临界CO2萃取法(SFE)两种工艺制备的生姜油树脂中姜辣素的有效含量。分别为13.84%和1.46%。结果表明SFE萃取的生姜油树脂品质优,天然有效成分含量高。 相似文献
18.
Abstract: In the present study, fatty acids and essential oils of the flower of borage ( Borago officinalis L.) were obtained by supercritical carbon dioxide fluid extraction under different conditions. The extracts obtained were compared to oils of borage flower oil isolated by hydrodistillation. The obtained oils were analyzed by gas chromatography mass spectrometry. The compounds were identified according to their retention indices and mass spectra. The experimental parameters of supercritical fluid extraction (SFE) were optimized using a central composite design after a full factorial experimental design. Extraction yields based on SFE varied in the range of 0.02% to 1.96% (w/w), and the oil yield based on the hydrodistillation was 0.05% (v/w). The optimum conditions of SFE were obtained at a pressure of 350 atm, a temperature of 65 °C, a methanol modifier volume of 100 μL, and static and dynamic extraction time of 10 min. Main components of the extracts under optimum SFE conditions were palmitic acid, linoleic acid, γ‐linolenic acid, and oleic acid. The results indicated that by using the suitable extraction conditions, SFE is more effective than the conventional hydrodistillation method in the extraction of fatty acids and the preservation of its quality. Practical Application: SFE is a good technique for the extraction of oils from plants. The extraction yields by SFE are more than the conventional method. SFE is used on a large scale for production of essential oils and pharmaceutical products from plants. 相似文献
19.
This study was conducted to define the antioxidant properties and cytoprotective mechanisms of sea buckthorn fruit extract (SFE) against cellular oxidative stress in mouse embryonic fibroblast (MEF) cells. Cell viability of MEF cells damaged by H2O2 was significantly increased by addition of SFE in a concentration dependent manner. Cytoprotective effect of SFE against oxidative damage was observed to be co-related with regulation of cell cycle progression. Induction of cell cycle arrest in G2/ M checkpoint was mediated by oxidative stress, but significantly reduced by treatment of MEF cells with SFE. Analysis of key regulatory proteins involved in G2/M arrest showed that SFE treatment leads to down-regulation of both phosphorylated Chk1 and cyclin B, which play important roles in cell cycle arrest of oxidatively damaged cells. Effect of SFE on apoptosis was evaluated by morphological and flow cytometric analysis. Apoptotic cell accumulation occurred by H2O2 treatment was decreased by co-treatment of MEF cells with SFE. Early apoptotic process involved in DNA fragmentation and condensation was also inhibited by additional treatment with SFE. Overall results suggest that cytoprotective effect of SFE is mediated by effective radical scavenging activity as well as altered cell cycle regulation which prevent apoptotic cell death induced by cellular oxidative stress. 相似文献
|