共查询到18条相似文献,搜索用时 78 毫秒
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目的:研究纤维素酶法辅助提取花生壳中木犀草素的最佳工艺条件。方法:采用HPLC法测定木犀草素含量,以提取率为指标,分别考察料液比、加酶量、pH值、温度、时间对纤维素酶酶解反应的影响,并将筛选工艺与目前文献的乙醇直接提工艺进行对比分析。结果:纤维素酶酶解花生壳的最佳工艺条件:料液比为1∶8(w/v)、酶用量为25U/g药材的量、酶解pH值为4.8、酶解温度50℃、酶解时间为6h。结论:与传统乙醇直接提取工艺相比,酶法辅助提取工艺提取花生壳中木犀草素的提取率提高了2.15倍。 相似文献
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花生壳甲醇提取物中木犀草素的分离与鉴定研究 总被引:13,自引:0,他引:13
花生壳甲醇提取物在聚酰胺层析柱上经不同比例的乙醇-水溶液洗脱,用高效液相色谱法分析,确定最佳洗脱液比例,并结合紫外-可见光谱法鉴定主要黄酮类化合物-木犀草素。分析结果表明,木犀草素在聚酰胺层析柱上,以70% ̄75%的乙醇-水溶液洗脱时,效果最佳;花生壳甲醇提取物中的木犀草素完全以游离形式存在;花生壳中木犀草素的含量约为0.3%。 相似文献
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Sara Rebolleda Sagrario BeltránM. Teresa Sanz María Luisa González-SanjoséÁngela García Solaesa 《Journal of food engineering》2013
The supercritical fluid extraction (SFE) of wheat bran alkylresorcinols has been studied. Extractions were carried out at 40.0 MPa. The effect of particle size, static extraction pretreatment with supercritical CO2 (SC-CO2) and extraction temperature on the extraction kinetics was investigated. The extraction yield increased as the particle size decreased and with temperature. Extraction curves present a faster and linear initial extraction period followed by a slower extraction period. Based on these results the approximate mathematical model of Sovová was successfully applied to describe the extraction curves. The total content of alkylresorcinols was determined and compared with the alkylresorcinol content obtained by conventional organic solvent extraction. Due to the amphiphilic nature of these resorcinolic lipids, the extraction yield was higher for polar organic solvents than for SC-CO2. Characterization of supercritical extracts was also performed by determining the fatty acid composition and antioxidant activity. 相似文献
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研究了以柚皮为原料,酶辅助超临界二氧化碳提取柚皮甙的工艺条件。以提取率为指标,研究了酶处理条件的影响,在单因素实验的基础上,通过正交试验优化酶处理条件。结果表明,在酶处理温度50℃、pH4.0、加酶量3%、处理时间2.5h的条件下,柚皮甙的提取率可达到3.68%,用酶辅助超临界二氧化碳提取法提取所得的菊苣酸较传统提取方法具有提取率高,产品的纯度好,流程简单的优点,相对直接使用超临界二氧化碳提取能够进一步提高提取率的优点。 相似文献
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超临界CO2萃取枸杞色素中β—胡萝卜素研究 总被引:7,自引:0,他引:7
应用超临界CO2萃取分离技术,以枸杞油作为载体,从枸杞色素中分离萃取β-胡萝卜素,对其理化指标进行检测分析,为从枸杞色素中提取β-胡萝卜素作为制药原料奠定基础。 相似文献
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Onur Döker Uğur Salgin Nuray Yildiz Mihrican Aydoğmuş Ayla Çalimli 《Journal of food engineering》2010
In this work, extraction of sesame oil from sesame seeds using supercritical CO2 was carried out. The effect of operating parameters such as pressure, temperature, and supercritical CO2 flow rate and particle size on extraction yield were investigated. An increase in the pressure and the supercritical CO2 flow rate improved the extraction yield and also shortened the extraction time. The extraction yield increased as the particle size decreased depending on decreasing intraparticle diffusion resistance. The maximum extraction yield obtained was about 85% (relative to Soxhlet extraction by hexane) at 50 °C, 350 bar, 2 mL CO2/min, 300–600 μm of particle size. Some extraction curves were modeled with two mathematical approaches as shrinking core model and broken and intact core model. The evaluation of model parameters showed that shrinking core model, however, is better than broken and intact cell model. 相似文献
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以陆英为原料,采用单因素和响应面试验优化其挥发油的超临界CO_2萃取工艺,重点探讨CO_2流量、萃取压力、萃取时间、萃取温度对陆英挥发油得率的影响,并通过气相色谱-质谱(GC-MS)对陆英挥发油成分进行定性定量分析。结果表明,优化的陆英挥发油提取工艺条件为:CO_2流量25L/h、萃取压力30.5 MPa、萃取温度45.0℃、萃取时间2.8h,该条件下陆英挥发油得率为0.86%。从陆英挥发油中鉴定出了16个成分,占挥发油含量约93.87%,其中含量较多的有3-甲基戊酸(29.37%)、3-甲基丁酸(13.83%)、E-4-己烯-1-醇(8.27%)等,另外3-乙硫基丁醛(6.46%)含量也较多。 相似文献
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为解决传统亚麻煮漂工序耗水耗能高、环境污染严重、经济成本高的问题,提出以超临界CO2流体为介质,以复配生物酶(木聚糖酶、纤维素酶和葡萄糖氧化酶)为煮漂剂对亚麻粗纱进行超临界CO2煮漂,研究超临界CO2流体中煮漂条件对亚麻粗纱白度的影响。试验结果表明,在生物酶质量分数3%、生物酶复配比1∶2∶1(纤维素酶∶木聚糖酶∶葡萄糖氧化酶)、温度50℃、压力15 MPa和时间90 min的条件下,亚麻粗纱白度可达42.5%。同时,初步探讨了超临界CO2生物酶体系下亚麻粗纱的煮漂机理。 相似文献
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试验研究了超临界CO2萃取姜油树脂过程中生姜的干燥方式对萃取物主要成分的影响.采用真空冷冻干燥方法脱除莱芜生姜中的水分,然后用超临界CO2萃取生姜中的姜油树脂.对所得萃取物进行气相色谱-质谱联用分析.并与常规的常温干燥脱水生姜超临界CO2萃取物的分析结果比较.结果表明冷冻干燥与常温干燥脱水所得姜油树脂主要成分不同,冷冻干燥处理样品提取物中含量最高的物质为姜酮,占提取物总量的20.802%,姜辣素组分占52.410%,挥发油组分占22.740%,姜辣素含量高于挥发油含量;常温干燥样品其中含量最高的为没药烯,占总含量的28.157%,挥发油组分占52.410%,姜辣素组分占26.738%,挥发油含量高于姜辣素含量.物料干燥方式对超临界CO2萃取姜油树脂成分有较大影响,与常温干燥相比冷冻干燥生姜的超临界CO2萃取物中含有更多的姜辣素类成分. 相似文献