共查询到20条相似文献，搜索用时 246 毫秒
1.
树舌菌丝体多糖GPI的分离、纯化及成分分析 总被引：1，自引：0，他引：1
从树舌发酵菌丝体中提取水溶性粗多糖(GP),再从粗多糖中分离得到均一多糖并研究其单糖组成.采用DEAE cellulose及sephadex G200注色谱法进一步纯化得GPI,并利用柱色谱、醋酸纤维素薄膜电泳等方法检验纯度,GC和PC法测其单糖组成.结果表明,GPI为均一中性杂多糖,相对分子质量为2 000,单糖组成为Xyl、Man、Gal、Glc,摩尔比依次为0.027:1.0:5.88:3.0,GPI首次从树舌菌丝体中分离获得. 相似文献
2.
野生松乳菇和野生红汁乳菇蛋白多糖的研究 总被引：1，自引：0，他引：1
选用合适的溶剂、方法、条件从野生松乳菇和野生红汁乳菇中提取蛋白多糖。粗多糖经Sevage法脱游离蛋白、DEAE - 纤维素柱、SephadexG-100柱层析分离、纯化, 纯化的蛋白多糖进行紫外及红外光谱分析并测定蛋白质、多糖的含量及抗氧化能力。结果表明, 松乳菇蛋白多糖中蛋白质和多糖含量分别为24.53%和68.83%; 红汁乳菇中分别为15.53%和66.52% , 两蛋白多糖均具有体外抗氧化的能力。经鉴定松乳菇蛋白多糖中单糖组成主要是葡萄糖、果糖和甘露糖, 红汁乳菇蛋白多糖中单糖组成主要是葡萄糖、果糖和半乳糖。 相似文献
3.
金针菇多糖组成的探讨与分析 总被引：1，自引：0，他引：1
为探讨金针菇多糖的组成,以金针菇子实体中分离纯化得到的多糖为研究对象,采用DEAE Cellulose-52、高效凝胶过滤色谱法(HPGFC)、PMP柱前衍生高效液相色谱法,分析了金针菇多糖的组成、分子量及单糖组分。结果表明,金针菇多糖由3种多糖组分组成,重均分子质量分布分别为4 191 338、372 779、19 002,其中重均分子质量最大的多糖组分为中性多糖,其余2种重均分子质量较小的多糖组分为酸性多糖,且2种酸性多糖所占比例明显大于中性多糖,分别占44.31%和37.76%,中性多糖仅占17.93%;金针菇多糖由葡萄糖(Glc)、甘露糖(Man)、半乳糖(Gal)、木糖(Xyl)、岩藻糖(Fuc)5种单糖组成,其中Glc含量比最高,其次是Gal和Man,Xyl和Fuc含量相对较低,5种单糖组成的摩尔比为13.05∶2.75∶3.16∶1.48∶1.00。由此可推断,金针菇多糖可能是以葡聚糖为主,同时含有半乳糖聚糖、甘露聚糖、木糖聚糖或者岩藻聚糖等多个多糖组分构成的混合多糖。 相似文献
4.
5.
6.
采用水提醇沉法提取元蘑（Hohenbuehelia serotina）粗多糖，计算其提取率、测定其总糖和蛋白含量。用葡聚糖凝胶柱层析法分离纯化得到均一多糖（HSP），采用高效液相色谱法分析HSP的相对分子质量，离子色谱法分析HSP单糖组成，傅里叶红外光谱法分析HSP的官能团，并测定其降血糖活性。结果表明：元蘑粗多糖提取率为（11.83±0.08）%，总糖含量为（38.27±0.66）%，蛋白含量为（1.84±0.02）%。HSP的总糖含量为（87.69±1.34）%，蛋白含量为（0.97±0.11）%，相对分子质量为7.78×106。HSP是一种杂多糖，其单糖由葡萄糖、半乳糖、木糖、阿拉伯糖、半乳糖醛酸、岩藻糖、鼠李糖、葡萄糖醛酸组成，摩尔比为34.99:5.68:4.85:2.31:1.19:1:0.16:0.13。HSP中存在糖醛酸、吡喃糖环的官能团。此外，3.0 mg·mL-1的HSP对α-淀粉酶、α-葡萄糖苷酶的抑制率分别为60.45%、55.33%，表明HSP具有较强的体外降血糖活性。 相似文献
7.
采用响应面法优化粘柄丝膜菌(Cortinarius collinitus)子实体多糖的超声辅助提取工艺,分别采用高效液相色谱(high performance liquid chromatography,HPLC)和气相色谱(gas chromatography,GC)进行多糖样品分子量测定和单糖组成分析;并检测多糖样品体外清除1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基和羟自由基的活性。结果表明:最佳提取工艺条件为液料比40∶1,提取温度68℃,提取时间2.6h,超声功率300 W,在此条件下粘柄丝膜菌多糖得率为5.97%,较常规水提(4.73%)提高了26%;粘柄丝膜菌多糖中糖含量为72.35%,该多糖是由鼠李糖、阿拉伯糖、木糖、甘露糖、半乳糖和葡萄糖6种单糖构成的杂多糖;800μg/mL多糖对DPPH自由基的清除率达71%,4mg/mL多糖对羟自由基的清除率达63%。 相似文献
8.
在分离野生鸡油菌(Canchare llus cibarius)的过程中获得一株伴生真菌LBJ016,对比研究了鸡油菌子实体及其伴生真菌菌丝体的营养成分.对鸡油菌子实体及LBJ016菌丝体中的微量元素、氪基酸、多糖含量及其单糖组成分析表明:LBJ016菌丝体中微量元素含量与鸡油菌子实体基本一致,氨基酸含量大约是鸡油菌子实体的2倍;LBJ016菌丝体多糖含量为8.28%,鸡油菌子实体多糖含量为12.59%,LBJ016菌丝体和鸡油菌子实体粗多糖各由3种单糖组成,其中LBJ016菌丝体多糖的单糖组分是葡萄糖、半乳糖和甘露糖,鸡油菌子实体的单糖组分是葡萄糖、半乳糖和核糖. 相似文献
9.
《果树学报》2020,(8)
【目的】对籽用西瓜果实瓜瓤多糖进行单糖组成及其一级结构进行鉴定,分析其与生物活性的关系,以评价籽用西瓜多糖的利用价值。【方法】通过水提醇沉法提取籽用西瓜瓜瓤粗多糖,使用Sephadex-G75(葡聚糖凝胶柱层析-G75)和DEAE-Sepharose(DEAE-纤维素柱层析)色谱分离纯化粗多糖得到纯化多糖(SⅠ),利用高效液相色谱法(HPLC)测定其相对分子质量和单糖组成,再通过红外光谱和核磁共振进一步鉴定其一级结构,最后采用体外抗氧化试验和体外抑菌试验分析其生物活性。【结果】纯化多糖SⅠ的HPLC分析结果表明该多糖相对分子质量为1 747 Da,由甘露糖、鼠李糖、半乳糖醛酸、葡萄糖、半乳糖、木糖、阿拉伯糖7种单糖组成,摩尔比为2.4∶2.2∶6.6∶36.8∶32.1∶7.2∶12.7;红外光谱分析和核磁共振分析显示SⅠ含有糖类化合物、糖醛酸基团和吡喃糖环的特征吸收峰,多糖中葡萄糖和半乳糖为α-D构型,甘露糖为β-D构型,鼠李糖为β-L构型。SⅠ对羟自由基和DPPH自由基均有清除作用,对Fe~(3+)具有一定还原力。SⅠ对酵母菌有较好的体外抑制效果。【结论】籽用西瓜瓜瓤多糖由多种单糖组成,单糖构型多样,具有较好的抗氧化活性和抑菌活性,在食品和医疗保健等行业中具有很大的开发利用价值。 相似文献
10.
采用醇沉法和膜分离法制备灵芝（Ganoderma lucidum）孢子多糖，测定其得率、多糖含量、单糖组成，并通过迟发型变态反应、脾细胞抗体生成、碳廓清、NK细胞活性实验，考察灵芝孢子多糖的免疫调节活性。结果表明：膜分离法制备的灵芝孢子多糖得率高于醇沉法，为（4.61±0.28）%；两者多糖含量无显著差异。醇沉法、膜分离法制备的灵芝孢子多糖单糖组成均为鼠李糖、木糖、甘露糖、葡萄糖、半乳糖和山梨糖，其摩尔比分别为0.34∶0.31∶1.44∶4.48∶3.35∶0.31和0.27∶0.10∶1.70∶6.08∶1.84∶0.31，均以葡萄糖为主要组成单糖。两种灵芝孢子多糖均能增强小鼠免疫调节活性。研究结果可为灵芝孢子多糖产业化提供参考。 相似文献
11.
采用反相高效液相色谱法(RP-HPLC)测定瓦尼木层孔菌(Phellinus vaninii)中柚皮素含量。瓦尼木层孔菌醇提物水解后采用RP-HPLC对柚皮素的含量进行测定,色谱条件:Hypersil ODS(4.6mm×100mm,3μm)色谱柱,流动相为1%冰醋酸溶液-甲醇(62∶38),柱温为40℃,流速为0.6mL/min,检测波长为288nm。标准曲线为A=4.18×106 X+40109(r=0.9998,n=5),柚皮素进样量在0.0202～2.020μg间线性关系良好,相对标准偏差(RSD)为1.56%(n=5),回收率为97.8%,重现性实验RSD为1.76%。该法适于瓦尼木层孔菌醇提物中柚皮素的含量测定。 相似文献
12.
AIM: To explore the effects of high-fat environment on glucose metabolism in rat myoblasts. METHODS: The rat myoblasts were exposed to palmitic acid (PA) at concentrations of 0.1 mmol/L, 0.3 mmol/L or 0.5 mmol/L for 6 h, 12 h or 24 h. The viability of the cells was determined by MTT assay. The oil red O dyeing method was used to display triglyceride (TG) sediment in the cells. Triglyceride content in the cells was measured by glycerophosphate oxidase-peroxidase(GPO-POD) method. The uptake of 2-deoxy-D- glucose ( -G) in rat myoblasts was determined by isotope tracer method. RESULTS: After exposed to PA at concentrations of 0.1~0.5 mmol/L for 6~24 h, the viability of rat myoblasts decreased, TG sediment and content increased,and -G uptake was inhibited in a concentration-and time-dependent manner. Compared with control group, the cell viability, TG sediment and content, and -G uptake were significantly changed in 0.3 mmol/L PA group (24 h) and 0.5 mmol/L PA groups (12 h and 24 h). CONCLUSION: With the elevating concentration of PA exposure, TG sediment increases and glucose uptake decreases in rat myoblasts. 相似文献
13.
AIMTo investigate the roles of protein phosphatase 4 (PP4) in down-regulation of endothelial nitric oxide synthase (eNOS) Ser633 phosphorylation induced by palmitic acid (PA). METHODSHuman umbilical vein endothelial cells (HUVECs) were treated with PA at 25 μmol/L, 50 μmol/L, 100 μmol/L and 200μmol/L for 36 h, or treated with PA at 100 μmol/L for 12 h, 24 h, 36 h and 48 h. Protein phosphatase 2A (PP2A) family inhibitor fostriecin (FST, 20 nmol/L) or okadaic acid (OA, 5 nmol/L) was selected to pretreat the HUVECs for 30 min. Protein phosphatase 4 catalytic subunit (PP4c) siRNA or protein phosphatase 2A catalytic subunit (PP2Ac) siRNA was transfected into the HUVECs. The protein expression levels of of eNOS, PP4c and PP2Ac, as well as the level of eNOS Ser633 phosphorylation, were detected by Western blot. The intracellular nitric oxide (NO) content was measured by DAF-FM DA. RESULTS(1) Compared with control group, the levels of eNOS Ser633 phosphorylation were decreased in PA groups in which the HUVECs were treated with 25 μmol/L, 50 μmol/L, 100 μmol/L and 200 μmol/L PA for 36 h (P< 0.05) and 100 μmol/L PA for 24 h, 36 h and 48 h (P< 0.05). No significant difference in the level of total eNOS protein expression among all the groups was observed. (2) Compared with control group, both FST and OA pretreatment reversed the reduction of eNOS Ser633 phosphorylation (P< 0.05) and the decrease in intracellular NO content (P< 0.05) induced by PA. No significant difference in the level of total eNOS protein expression among all the groups was observed. (3) Compared with si-Control group, the PP4c protein expression was significantly reduced (P< 0.05), while the level of eNOS Ser633 phosphorylation was significantly increased in si-PP4c group (P< 0.05). Although the levels of PP2Ac protein expression declined significantly (P< 0.05), the level of eNOS Ser633 phosphorylation remained unchanged in si-PP2Ac group. No significant differencein the level of total eNOS protein expression among all the groups was found. CONCLUSION PA significantly reduces the level of eNOS Ser633 phosphorylation and the content of NO in the HUVECs, which may be due to PA inducing the activation of the PP2A family member PP4 rather than PP2A. 相似文献
14.
LU Chun-li HU Dong-hui CHU Jia-cheng ZHOU Xia-li CHEN Wei-wei SUN Ming-jin 《园艺学报》2018,34(11):1963-1967
AIM: To investigate the effect of angiotensin (1-7)[Ang (1-7)] on palmitic acid (PA)-induced injury of Min6 cells and the potential protective mechanisms of autophagy. METHODS: Cultured Min6 cells were divided into 7 groups:control group, PA group, PA+Ang(1-7) group, PA+Ang(1-7)+A779 group, PA+Ang(1-7)+rapamycin group, Ang(1-7) group and A779 group. The function of Min6 cells was detected by glucose-stimulated insulin release test. Intracellular reactive oxygen species (ROS) production was measured by ROS assay kit. Apoptosis was analyzed by flow cytometry with Annexin V/PI staining. Autophagy-related proteins were determined by Western blot. RESULTS: Compared with control group, the secretion of insulin from Min6 cells in PA group was significantly decreased (P<0.05), and the apoptotic rate was increased (P<0.05). The ratio of LC3-Ⅱ/LC3-I was significantly increased (P<0.05). Compared with PA group, the insulin secretion in PA+Ang(1-7) group was increased (P<0.05). The intracellular ROS level and the A779 and LC3-Ⅱ/LC3-I were significantly decreased (P<0.05). This protective effect of Ang(1-7) was partially blocked by A779 and rapamycin. CONCLUSION: Ang(1-7) attenuates PA-induced Min6 cell injury, and its protective mechanism may be related to inhibiting the activity of autophagy. 相似文献
15.
研究了高效液相色谱法测定香蕉根中4种内源激素:赤霉素(GA3)、3-吲哚乙酸(IAA)、脱落酸(ABA)和玉米素(ZT)的最佳条件。采用Agilent ZORBAX SB-C18柱(250mm×4.6mm,5μm)进行分离测定。结果表明:GA3、IAA、ABA测定的最佳条件是甲醇∶乙腈∶磷酸缓冲液(pH 3.5)为15∶20∶65为流动相,检测波长为210nm。ZT测定最佳条件为:甲醇∶乙腈∶磷酸缓冲液(pH 3.5)为15∶15∶70为流动相,波长265nm。4种激素的进样量为20μL,流速为1mL/min,柱温为35℃。选用外标法进行了定量测定。试验结果表明其回收率高,是一种快速有效的测定方法。 相似文献
16.
AIM: To observe the effects of nobiletin on palmic acid (PA)-induced lipidosis in hepatocytes and to discuss the regulatory mechanism of lncLSTR. METHODS: AML12 cells were cultured in vitro. The control group, PA group (0.2 mmol/L) and protection group (exposure to nobiletin at 1 mg/L, 5 mg/L, 15 mg/L or 50 mg/L for 2 h, followed by treatment with 0.2 mmol/L PA) were established according to the experimental requirements. The lipid accumulation was morphologically observed by Oil red O staining in the cells. The qPCR was applied to detect mRNA expression, and the protein expression was determined by and Western blot. RESULTS: PA treatment (0.2 mmol/L) induced lipidosis, while 50 mg/L nobiletin pretreatment suppressed the lipidosis. Compared with control group, the mRNA expression of Apoc2 in PA group was significantly down-regulated (P<0.05), but increased by nobiletin pretreatment compared with PA group (P<0.05). The protein expression of Apoc2 in PA group was significantly down-regulated (P<0.05), but increased by nobiletin pretreatment (P<0.05). The expression of lncLSTR in PA group was significantly increased (P<0.05) and that was inhibited by nobiletin pretreatment (P<0.05). A negative correlation between Apoc2 protein and lncLSTR expression in PA group (R2=0.717 9, P<0.01) was observed. A negative correlation between Apoc2 protein and lncLSTR expression in protection group (R2=0.525 3, P<0.05) was also found. CONCLUSION: Nobiletin has anti-lipidosis effect on hepatocytes. The mechanism is partially related to the inhibition of up-regulation of lncLSTR, thus down-regulating Apoc2 expression. 相似文献
17.
为了解柱状田头菇(Agrocybe aegerita)子实体色素类别和性能,对柱状田头菇子实体中色素进行了提取、纯化和鉴定并对其稳定性和抗氧化活性进行研究。结果表明:柱状田头菇色素易溶于碱性溶液,微溶于水,不溶于有机溶剂;紫外光区212nm处有最大吸收峰,傅利叶红外光谱图与酪氨酸合成黑色素相似,初步鉴定柱状田头菇色素属于3,4-二羟基苯丙氨酸类黑色素;pH11~14,20~100℃范围内,黑暗条件下柱状田头菇黑色素稳定性较好,在自然光条件下稳定性最差,其次是紫外光;柱状田头菇黑色素具有一定的还原能力、DPPH·清除能力及Fe2+螯合能力。 相似文献
18.
This study investigates the associations between quality of urban green spaces (UGS), self-reported physical activity (PA), and health indicators in Aydın, Turkey. Data was collected through a survey with 420 participants. The associations between quality of UGS, self-reported frequency and duration of PA, and stress, mental health, and physical health were examined with multivariate linear regression while controlling for confounding factors. Results showed that nearest distance to UGS and quality of UGS (i.e. maintenance and cleanliness) were associated with increased frequency of PA. Higher frequency of PA was related to less stress and better mental health and longer duration of PA was associated with better physical health. In addition, large and open/visible UGS were associated with better physical health. The findings also showed that stress mediates the relationship between PA and mental health. Results suggest that providing large, visible as well as clean and well-maintained UGS close to people's homes may be an effective strategy to improve PA and people's health. 相似文献
19.
20.
风险监测显示市面上陆续出现了添加硝苯地平等二氢吡啶类降血压药物的绿茶,而我国目前尚未有绿茶中硝苯地平的权威检测方法。本试验根据实际需要建立了液相色谱串联质谱法检测绿茶中硝苯地平的方法。首先对绿茶样品进行前处理,采用甲醇超声提取,经过CARB-NH2固相萃取柱净化;然后进行色谱分析,以Inertsil ODS-3(150 mm×2.1 mm,5.0μm)为液相色谱柱,乙腈、0.2%乙酸水溶液为流动相,流速为0.3 mL/min;质谱采用正离子扫描,多反应监测方式检测绿茶中的硝苯地平含量。试验考察了方法学中的线性方程、检出限和定量限、加标回收率、重复性等指标。结果表明:在1~20 ng/mL范围内线性良好,相关系数为0.9996;检出限为13.8μg/kg,定量限为46.0μg/kg;加标回收率在2、4、8 ng/mL三个水平分别为83.5%、86.3%、89.6%,相应水平重复性依次为3.98%、3.43%、1.16%;所考察的指标均满足方法学要求。该方法操作简单、准确、可行,适用于绿茶中硝苯地平的检测。 相似文献