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1.
不同方法提取米糠多糖工艺的优化研究   总被引:2,自引:1,他引:1  
王莉  陈正行  张兵 《食品科学》2007,28(4):112-116
以脱脂挤压米糠为原料,采用热水浸提、超声波和高压脉冲强化提取三种不同方法提取米糠多糖。结果表明:热水浸提法、超声波法和高压脉冲法提取米糠多糖得率分别为2.02%、2.87%和2.59%。与传统热水浸提法相比较,采用超声波和高压脉冲法强化提取米糠多糖具有迅速、节能、高效、提取率高等诸多优点。  相似文献   

2.
不同方法提取大枣多糖工艺的优化研究   总被引:12,自引:0,他引:12  
林勤保  赵国燕 《食品科学》2005,26(9):368-371
采用热水浸提、微波和超声波强化提取等3种不同方法提取大枣多糖。结果表明,微波和超声波法提取大枣多糖具有快速、安全、简便、成本低且得到的多糖提取率高,而成分又不被破坏的优点。其中微波辅助提取法的最佳提取率达1.137%,超声波法为0.982%,热水浸提法则为0.889%。  相似文献   

3.
研究3种不同浸取柿叶黄酮类物质的工艺方法及优化工艺参数,通过正交试验,得出超声波水提法、超声波溶剂提取法和微波溶剂提取法的最佳工艺条件,3种方法在最佳工艺条件下的黄酮类物质提取量依次为5.28%、6.19%和6.15%;超声波水提法经济适用,适合生产化,超声波溶剂提取法和微波溶剂提取法所得提取黄酮类物质较高,比超声波水提法高出约0.8%。  相似文献   

4.
苦荞种子总黄酮提取方法的比较研究   总被引:2,自引:0,他引:2  
目的比较不同方法提取苦荞种子总黄酮的效果。方法分别用乙醇回流提取法、微波辅助提取法、超声波提取法、碱水浸提法及热水浸提法提取苦荞种子总黄酮,用高效液相色谱法测定总黄酮含量,计算提取产率。结果乙醇回流提取法提取总黄酮产率最高,微波和超声波提取法次之,碱水和热水浸提法最低。结论微波提取法具有明显的高效性,适于大量提取苦荞种子总黄酮。  相似文献   

5.
董兴叶  孙楚  刘瑶  吴非 《食品工业科技》2014,(16):294-297,307
以燕麦为原料,采用超声波法提取燕麦β-葡聚糖。用刚果红法检测β-葡聚糖得率。通过单因素实验及正交实验确定超声波法提取的最优工艺条件。超声波法与水提法提取的β-葡聚糖的性质进行对比。研究表明,提取β-葡聚糖的最优条件为:液料比20∶1,超声波功率720W,超声波时间35min,提取温度50℃,pH10,按超声波法提取的最优工艺条件,燕麦β-葡聚糖得率可达4.09%,水提法β-葡聚糖的得率仅为3.05%。与水提法相比,超声波法提取的β-葡聚糖性质,如持水性、持油性提高。  相似文献   

6.
目的 比较不同方法提取苦荞种子总黄酮的效果.方法 分别用乙醇回流提取法、微波辅助提取法、超声波提取法、碱水浸提法及热水浸提法提取苦荞种子总黄酮,用高效液相色谱法测定总黄酮含量,计算提取产率.结果 乙醇回流提取法提取总黄酮产率最高,微波和超声波提取法次之,碱水和热水浸提法最低.结论 微波提取法具有明显的高效性,适于大量提取苦荞种子总黄酮.  相似文献   

7.
在单因素试验基础上,采用响应面法对富硒蛹虫草硒多糖超声波-微波协同提取工艺进行优化,并与超声波提取法和水提法提取硒多糖抗氧化活性进行比较分析,探究3种提取方法对硒多糖提取效果的影响。结果表明:超声波—微波协同提取最佳工艺条件为超声时间26.0 min、微波时间3.20 min、微波功率350 W、液料比32.00∶1(mL/g),在此条件下,硒多糖提取率为5.05%,比超声提取法和水提法分别提高了19.96%和3.70%;3种提取方法硒多糖体外抗氧化活性排序依次为:超声波—微波协同提取法超声波提取法水提法。此外,超声波—微波协同提取法可获得更高的多糖硒含量,为360.37 mg/kg,相比超声提取法和水提法分别提高了4.47%和12.92%。  相似文献   

8.
以北五味子为原料,多糖得率为指标,研究水提法、酶法、超声波辅助法三种方法提取北五味子多糖,通过正交实验的方法分别研究了多糖的最佳提取工艺条件.结果表明:超声波辅助法提取五味子多糖得率大于酶法和水提法,其最佳工艺条件为:料液比1∶25,超声时间40min,超声功率600W,提取温度55℃,多糖得率为4.67%.  相似文献   

9.
以莲子心总黄酮提取率、干浸膏得率为指标,对碱溶酸沉法、水提法、常规醇提法、超声波辅助醇提法、微波辅助醇提法提取莲子心黄酮进行比较研究与分析,优化莲子心黄酮的提取工艺。考察5种提取方法对考察指标的影响,并计算综合评价指标Y值。Y值的大小顺序依次为微波辅助醇提法超声波辅助醇提法常规醇提法水提法碱溶酸沉法。莲子心总黄酮的提取以微波辅助醇提法为佳。  相似文献   

10.
采用有机溶剂浸提法、超声波辅助法和微波辅助法提取紫薯花青素,并对温度、酸碱度、氧化剂、还原剂、金属离子、光照强度、食品添加剂等7种不同因素对所提取的紫薯花青素进行稳定性综合评价。结果表明,超声波法提取紫薯花青素含量最高,微波法居中,浸提法最低;从稳定性来看,微波法提取的紫薯花青素热稳定性效果最佳,超声波法提取的紫薯花青素对其他干扰因素稳定性最佳。  相似文献   

11.
The lipids of alga Scenedesmus obliquus grown under controlled conditions were separated and fractionated by column and thin-layer chromatography, and fatty acid composition of each lipid component was studied by gas-liquid chromatography (GLC). Total lipids were 11.17%, and neutral lipid, glycolipid and phospholipid fractions were 7.24%, 2.45% and 1.48% on a dry weight basis, respectively. The major neutral lipids were diglycerides, triglycerides, free sterols, hydrocarbons and sterol esters. The glycolipids were: monogalactosyl diglyceride, digalactosyl diglyceride, esterified sterol glycoside, and sterol glycoside. The phospholipids included: phosphatidyl choline, phosphatidyl glycerol and phosphatidyl ethanolamine. Fourteen fatty acids were identified in the four lipid fractions by GLC. The main fatty acids were C18:2, C16:0, C18:3(alpha), C18:1, C16:3, C16:1, and C16:4. Total unsaturated fatty acid and essential fatty acid compositions of the total algal lipids were 80% and 38%, respectively.  相似文献   

12.
The body lipids of a fresh water fish were separated into classes and subclasses. The nonpolar lipid class was separated into seven different subclasses. The fatty acid composition of triacylglycerols, sterol esters and free fatty acids were determined. A substantial amount of C20:4n-6 (AA), typical of tropical water fish, was present. In addition to other fatty acids common in fresh water fish, short-chain saturated fatty acids, namely C8:0, C10:0 and odd-chain fatty acids C13:0, C13:1, C17:0, C17:1 and C19:0 were detected in relatively large proportions. The principal fatty acids were C14:0, C16:0, C16:1, C18:0, C18:1, C18:2n-6, C18:3n-3, C20:4n-6, C20:5n-3 and C22:6n-3. The patterns of fatty acid distribution within lipid classes showed general similarities.  相似文献   

13.
目的采用高速逆流色谱技术分离纯化红景天苷、葛根素和淫羊藿苷3种标准样品。方法采用溶剂体系正丁醇:乙酸乙酯:水(2:3:5,V:V:V)分离红景天粗提物;采用溶剂体系正丁醇:乙酸乙酯:水(1:2:3,V:V:V)分离葛根粗提物;采用氯仿:甲醇:水(4:3.5:2,V:V:V)分离淫羊藿苷粗提物,并采用高效液相色谱法对所得单体进行纯度检测。结果所得红景天苷、葛根素、淫羊藿苷标准样品纯度分别为98.9%、99.8%和99.5%。将核磁共振(nuclear magnetic resonance,NMR)13C-NMR数据归属并与相关文献比对,进一步确认了该3种物质的结构。结论红景天苷、葛根素、淫羊藿苷3种样品满足GB/T 15000.3-2008标准样品工作导则的要求,可用于相关药品检测方法的校正和相关产品的质量控制。  相似文献   

14.
桑叶多糖的分离纯化及组成研究   总被引:11,自引:1,他引:10  
欧阳臻  陈钧  李永辉 《食品科学》2005,26(3):181-184
本文对桑叶多糖的提取、分离纯化和单糖的组成进行了研究。桑叶经热水提取乙醇沉淀得多糖粗品,经脱蛋白,乙醇分级沉淀、DEAE-纤维素柱和Sephadex G-100柱层析,纯化得MP11、MP12、Mp13三个多糖组分。经糖腈乙酰化处理后进行气相色谱分析得知MP11由Rha、Ara、Xyl、Man、Glu、Gal组成,其比例为21:16:3:3:1:20;MP12由Rha和Glu组成,其比例为3:1:MP13主要由Rha组成。为桑叶多糖的进一步研究提供了基础。  相似文献   

15.
目的:探讨藤茶中的主要活性成分二氢杨梅素(DMY)和杨梅苷(MYT)抑制HepG2细胞增殖的协同作用。方法:通过对体外培养的细胞分别给予DMY、MYT和DMY:MYT为1:4、1:2、1:1、2:1、4:1、8:1的混合物,采用MTT法和荧光染色法测定其对HepG2细胞活力的影响,并用合用指数(CI)和等效曲线法分析二者的协同作用。结果:DMY和MYT能够抑制HepG2肿瘤细胞的增殖,且IC50分别为56.46和95.01 μmol/L。当二者比例为1:4~8:1时,对HepG2肿瘤细胞增殖的IC50为40.90~73.00 μmol/L,CI值为0.60~0.86,其中1:1时协同作用最强,等效线法也表明二者存在协同作用。结论:DMY和MYT联用能够有效提升单体化合物对HepG2细胞的抑制作用,呈现出协同作用,这为藤茶进一步的功能研究和应用提供了依据。  相似文献   

16.
Saito H 《Food chemistry》2012,135(3):1718-1729
The lipid and fatty acid compositions of the muscle and liver of two subtropical Seriola fish species, Seriola dumerili and Seriola rivoliana, were investigated. The lipid levels of cultured S. dumerili were significantly higher than were those of the wild ones. Triacylglycerols and phospholipids were the dominant lipids of both the cultured and wild. In both species, the major fatty acids in the muscle and liver triacylglycerols were 14:0 (cultured), 16:0, 18:0, 16:1n-7, 18:1n-7, 18:1n-9, 18:2n-6 (linoleic acid: LA, cultured), 20:5n-3, and 22:6n-3. In spite of similar levels of many of the fatty acids between cultured and wild triacylglycerols, the cultured samples had markedly higher levels of LA with trace levels of 20:4n-6 (arachidonic acid: ARA) and 22:5n-6, while the wild ones had very low 18:2n-6 levels with small levels of ARA and 22:5n-6. The ratio (R(LA/ARA)) of LA to ARA in the cultured samples was markedly higher than were those of the wild samples.  相似文献   

17.
The proximate composition and fatty acid content of spinach were determined in two processing stages. Crude protein and ash content were 2.89% and 1.96%, respectively. The total lipid content was 0-61%. The predominant fatty acids were palmitic (16:0), hexadecadienoic (16:2), hexadecenoic (16:1), stearic and hexadecatrienoic (18:0 and 16:3), oleic (18:1), linoleic (18:2) and linolenic (18:3). Little loss was observed as a result of processing. Soluble protein content showed losses of up to 87% during processing.  相似文献   

18.
Lipids were extracted from a single sample of wheat flour using three solvent systems: ethanol–diethyl ether–water (2:2:1 by vol.); chloroform–methanol (2:1 by vol.); and water-saturated n-butanol. Analysis of the extracts and of residual lipid in the extracted flour showed that water-saturated n-butanol was the most efficient solvent. Wheat-flour lipids were extracted with water-saturated n-butanol and separated by chromatographic procedures into individual components. The lipid classes which were isolated and studied were steryl ester, free sterol, 6-O-acyl steryl glucoside, steryl glucoside, triglyceride, diglyceride, monoglyceride, free fatty acid, monogalactosyl diglyceride, 6-O-acyl monogalactosyl diglyceride, digalactosyl diglyceride, digalactosyl monoglyceride, monoglycosyl ceramide, diglycosyl ceramide, N-acyl phosphatidyl ethanolamine, N-acyl lysophosphatidyl ethanolamine, phosphatidyl ethanolamine, lysophosphatidyl ethanolamine, phosphatidyl choline, lysophosphatidyl choline, phosphatidyl serine and phosphatidyl inositol. Monogalactosyl monoglyceride was also tentatively identified. The quantitative distributions of the lipid classes were determined. Monoglycosyl ceramide contained small amounts of normal fatty acids (12:0–24:0) and large amounts of 2-hydroxy fatty acids (principally 16:0 and 20:0), with similar amounts of dihydroxy long-chain bases (18:0 and 18:1) and trihydroxy long-chain bases (18:0, 18:1, 19:0, 19:1, 20:0, 22:0). The principal sterols were identified as β-sitosterol, campesterol, and C28 and C29 saturated sterols. The fatty acids in the sterol lipids were principally 16:0 (50–60%) and 18:2 (28–30%) with small amounts of 16:1, 18:0, 18:1 and 18:3. The fatty acids in all the glycerides were principally 18:2 (51–84%) with lesser amounts of 16:0, 18:0, 18:1 and 18:3.  相似文献   

19.
目的建立一种鲍鱼内脏多糖的双水相盐析萃取—酶解法的提取工艺,并对多糖组成进行分析。方法样品经双水相盐析萃取,木瓜蛋白酶酶解醇沉后获得粗多糖。考察鲍鱼内脏干粉的加入量和酶对多糖得率的影响。结果鲍鱼内脏多糖双水相盐析萃取的最适条件为:乙醇30%(V:V)、碳酸钠12%(m:V)和鲍鱼内脏冻干粉加入量7 g/100 mL,酶解最适用酶为木瓜蛋白酶。在此条件下,鲍鱼内脏多糖得率为3.76%。结论经液相色谱分析,该多糖由甘露糖、氨基葡萄糖、鼠李糖、葡萄糖醛酸、半乳糖醛酸、氨基半乳糖、葡萄糖、半乳糖、木糖和岩藻糖组成,其质量比为3.54:2.41:14.75:1.00:1.25:6.79:84.04:7.79:3.38:10.83。  相似文献   

20.
目的建立高效液相色谱法检测葡萄酒中溶菌酶的含量。方法葡萄酒样品经5%盐酸溶液酸化后,采用流动相A乙腈∶三氟乙酸∶水(50:0.2:49.8,V:V:V)和流动相B乙腈∶三氟乙酸∶水(1:0.2:98.8,V:V:V)进行梯度洗脱,经反相苯基柱分离后,用高效液相色谱仪荧光检测器或紫外检测器进行测定,通过保留时间定性,外标法定量,并优化流动相的配比、梯度洗脱程序和样品的酸化条件。结果本方法在50、200、500和750 mg/L添加水平下的回收率为93.5%~99.2%,相对标准偏差为1.62~5.74%(n=6),方法定量限为50 mg/L。结论本方法具有分离效能高、重现性好、准确可靠,灵敏度高等优点,测定结果与酶联免疫法结果一致。该方法可以满足葡萄酒中溶菌酶的检测需求。  相似文献   

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