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There is a need to increase vessel loads for high‐pressure batch processes such as supercritical fluid extraction of solid substrates, but a precompacting treatment such as pelletization may negatively affect mass transfer rates. This work was aimed to quantify the effect of the microstructure of Jalapeño pepper pellets on the extraction rate and yield of oleoresins when using supercritical CO2 at 40 °C and 320 bar as the solvent, so as to contribute with basic information that will help optimize pelletization treatments for solid substrates. Four types of substrates were obtained by considering 2 initial particle sizes and 2 initial moisture levels before pelletization, and the inner porosity and tortuosity of the resulting pellets were estimated. The internal mass transfer was favored in pellets showing a better distribution and connectedness of pores, and the extraction rate and yield improved when using pellets from flakes instead of milled flakes, with initial sample moisture exhibiting a more limited effect. A reduction in the particle size of the pellets improved mass transfer but caused a reduction in packing density, and these 2 factors had opposite effects on the “volumetric yield” of the process (mass of recovered solute per unit time and per unit volume of extraction vessel), which was also affected by prepelletizing sample conditioning. 相似文献
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以辣椒油树脂为原料,研究浓缩、皂化和结晶条件对辣椒碱类化合物提取率和纯度的影响。采用单因素和正交试验设计优化辣椒油树脂浓缩和辣椒碱类化合物的提取工艺。结果表明:影响辣椒油树脂浓缩效果的4 个因素是甲醇体积分数>浸提温度>甲醇溶液用量>浸提时间,影响辣椒碱类化合物提取率的4个因素依次为皂化时间>pH 值>结晶温度> NaOH 质量分数;获得最佳工艺条件:质量分数1.5% 的辣椒油树脂用体积分数80% 甲醇浓缩得到质量分数36% 的辣椒提取物,直接用质量分数10% NaOH 溶液在50℃条件下皂化4h,然后在5℃用稀盐酸调节pH7.0,静置结晶,提取率为86.67%。产品经HPLC 分析,纯度达97.87%。 相似文献
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研究超临界CO2萃取法中各因素对辣椒中辣椒油树脂、辣椒素、辣椒红素提取效果的影响。采用正交试验L16(45)方法,以辣椒油树脂得率、辣椒红素色值、辣椒素含量为指标,确定超临界CO2萃取的最佳工艺条件,同时研究整粒粉碎细度对辣椒中各成分提取效果的影响,并对不同产地辣椒品种提取辣椒油树脂的品质和得率进行比较。结果:超临界CO2萃取辣椒中多种有效成分的最佳工艺条件为过筛孔径4 mm的整粒辣椒粉,萃取压力25 MPa,萃取温度40℃,萃取时间4 h,夹带剂乙醇质量分数10%,乙醇体积分数95%;此条件下供试辣椒品种中,重庆石柱朝天椒提取的辣椒油树脂得率较高6.7%,香辣味很好,辣椒红素色值E460=26.9,辣椒素含量8.54%,其次是贵州小米辣及河南洛阳新一代辣椒品种。 相似文献
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Génesis Karendash González‐Quijano Lidia Dorantes‐Alvarez Humberto Hernández‐Sánchez María Eugenia Jaramillo‐Flores María de Jesús Perea‐Flores Arturo Vera‐Ponce de León César Hernández‐Rodríguez 《Journal of food science》2014,79(8):M1545-M1553
The microbiota associated with spontaneous fermentation of vegetables in a saline substrate may represent an important group of bacteria in the food industry. In this work, the lactic acid bacteria (LAB) Weissella cibaria, Lactobacillus plantarum, Lactobacillus paraplantarum, and Leuconostoc citreum were identified by partial 16S rRNA gene sequence analysis. In addition, entophytic bacteria such as Pantoea eucalypti, Pantoea anthophila, Enterobacter cowanii, and Enterobacter asburiae were detected, but they were irrelevant for the fermentation process and were inhibited after 12 h of fermentation when the pH decreased from 6.5 to 4.9. Moreover, 2 species of yeast were isolated and identified as Hanseniaspora pseudoguilliermondii and Kodamaea ohmeri by their partial 26S rRNA gene sequence. The growth of LAB was evaluated at different sodium chloride contents. L. citreum was the most halotolerant species followed by L. plantarum and W. cibaria with a concentration index to obtain a 50% population reduction (IC50) of 7.2%, 6.6%, and 5.2%, respectively. Furthermore, the growth of LAB and Escherichia coli O157:H7 was evaluated in the presence of the main phenylpropanoids from chilli peppers such as p‐coumaric and ferulic acid. It was determined that LAB can grow in both acids at 4 mM, unlike E. coli O157:H7, whose growth is inhibited in the presence of these acids. 相似文献
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超临界CO2萃取花椒油树脂的研究 总被引:1,自引:0,他引:1
研究了萃取花椒油树脂的工艺,通过单因子实验和正交实验优化了超临界CO2萃取花椒油树脂的最佳工艺条件:原料粒度60目,流量25L/h,萃取时间2h,温度40℃,压力20MPa。 相似文献
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以萃取高纯度辣椒红色素的色价、吸光比、去除产品中的异味为目的,采用传统的溶剂法辣椒红色素为原料,用CO2超临界萃取为手段,系统的分析了CO2超临界的工作压力、流量、温度、时间,对辣椒红色素提纯的影响,通过UVPC-2401分光光度法对萃取产品进行了分析测试,确定了超临界萃取溶剂法生产的辣椒红色素的最佳工艺条件。由于温度对色素的热稳定性影响较大,本文对常温、40℃、50℃进行了研究,在一定的压力下,确定了40℃为最佳温度条件;在一定的温度下,压力低于15MPa色素有气味,20MPa下无气味无夹带,25MPa下有夹带,确定了压力为20MPa;CO2流量过大,增加推动力,确定了流量为0.3m3/h。以上条件下可以显著去除产品的异味,提高产品的色价、吸光比,经CO2超临界萃取的产品满足高端用户的需求。 相似文献
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提取姜油树脂的工艺参数及最佳因素水平组合的研究 总被引:2,自引:0,他引:2
目前提取姜油树脂的主要方法有:溶剂浸提法、压榨法、流体CO2浸提法和超临界CO2萃取法。超临界CO2萃取法分离物质是一种新的分离技术,有着良好的前景,它能使要分离的物质提高收率、提高品质。影响超临界CO2萃取姜油树脂的主要因素有萃取压力、萃取温度、萃取时间和萃取时CO2的流量。通过实验,我们确定了超临界CO2萃取姜油树脂的工艺参数,得出超临界CO2萃取姜油树脂的最佳因素水平组合是:A2B1C3D1,即萃取压力25MPa;萃取温度40℃;萃取时间2.5h;CO2泵频率15Hz。从极差R值可知,4个因素对超临界CO2萃取姜油树脂萃取率影响的主次顺序是:A>B>C>D,即萃取压力>萃取温度>萃取时间>CO2气体的流量,压力对超临界CO2萃取姜油树脂的影响最大。 相似文献
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用四川辣椒为原料,95%vol乙醇作提取溶剂,研究辣椒红色素的提取工艺.结果表明,提取辣椒红色素的优化工艺条件为提取温度50℃;提取时间2h;料液比11mL95%vol乙醇/g四川辣椒;提取次数为2次.该提取工艺具有生产成本低,操作简单安全,适于工业化的生产. 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
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Emilio Alvarez-Parrilla Laura A. de la Rosa Ryszard Amarowicz Fereidoon Shahidi 《Food chemistry》2012
The potential of fresh and processed Jalapeño and Serrano pepper extracts for the control of lipid oxidation in several systems was investigated. The assays used included β-carotene/linoleate model system, striped corn oil, ground pork meat and Cu(II)-induced oxidation of human low-density lipoprotein (LDL). The results showed that all extracts were effective in at least one system, although their potency varied. Extracts of smoked Jalapeño were particularly effective. The lipid-protective effect of the extracts was mainly due to the presence of phenolic compounds, but other phytochemicals, such as chlorophylls were also involved. 相似文献
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以辣椒红色素生产过程中的副产品辣椒油树脂为原料,采用食用油洗和甲醇萃取工艺进行辣椒油树脂的纯化研究。试验表明,最佳方案为:3倍质量的大豆油将辣椒油树脂在45℃下油洗,静置分层后,放出下层杂质,然后采用75%甲醇在45℃下对食用油层萃取,萃取3次,使辣椒油树脂中辣椒素含量由14.72%提高至34.19%,得率为95.25%。 相似文献
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