共查询到19条相似文献,搜索用时 218 毫秒
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冬虫夏草(Cordyceps sinensis)是麦角菌科真菌冬虫夏草寄生在蝙蝠蛾科昆虫幼虫上的子座及幼虫尸体的复合物,具有重要的药理作用。对虫草多糖、虫草菌丝体/子实体,以及虫草提取物和发酵产物在免疫调节方面的最新研究进展进行了综述。 相似文献
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以腺苷、尿苷、次黄嘌呤核苷、虫草素及次黄嘌呤为指标,测定泰山虫草菌丝体与天然冬虫夏草中相应成分的含量,探索泰山虫草代替天然冬虫夏草开发药物或保健食品的可能性。采用80%乙醇超声提取,在GF254硅胶板上点样后,以薄层色谱扫描法(TLCS)测定上述各种成分的含量。首次证明泰山虫草菌丝体核苷类及次黄嘌呤等有效成分含量明显高于冬虫夏草。其腺苷、尿苷、次黄嘌呤核苷、次黄嘌呤含量分别是冬虫夏草的8.25倍、3.76倍、11.8倍和1.55倍。2种虫草中有效成分的含量均表现为尿苷>次黄嘌呤核苷>腺苷>次黄嘌呤>虫草素。说明泰山虫草可以作为冬虫夏草代用品进行综合开发利用。TLCS法简捷快速,重现性、稳定性良好,能有效地对虫草中的有效成分进行定性定量分析。 相似文献
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人工培养的兰坪虫草子实体中核苷类成分研究 总被引:3,自引:0,他引:3
兰坪虫草(Ophiocordyceps lanpingensis)产于我国滇西北地区,是一种寄生在钩蝠蛾幼虫上的虫生真菌。本文以四种不同培养基培养的兰坪虫草子实体为原料,采用高效液相色谱法(HPLC)同时检测10种核苷类成分(尿嘧啶、尿苷、2'-脱氧尿苷、肌苷、鸟苷、腺嘌呤、胸腺、腺苷、2'-脱氧腺苷、虫草素),并将其与野生冬虫夏草(Ophiocordyceps sinensis)、野生兰坪虫草进行对比分析,初步评估人工培养兰坪虫草子实体的质量。结果表明,以大米和蚕蛹粉为主要原料的培养基所培养的兰坪虫草子实体生长时间平均为40 d,周期短于其他三种培养方式;且其腺苷、总核苷含量分别为2744μg/g和8015μg/g,明显高于野生冬虫夏草、野生兰坪虫草,有较好的质量水平。因此,人工培养的兰坪虫草子实体具有重要的研究价值和应用潜力。 相似文献
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本文旨在对冬虫夏草替代品的脂肪酸组成和稳定碳同位素比值及其变异规律开展研究。采用元素分析-同位素比值质谱仪(EA-IRMS)先对8种冬虫夏草替代品(包括6种蛹虫草和2种虫草菌丝体)和1个冬虫夏草子座样品的稳定碳同位素比值进行测定,再采用化学方法将其中性油脂和极性油脂进行高效分离,并采用气相色谱-质谱联用仪(GC-MS)对中性油脂和极性油脂的脂肪酸组成进行测定;最后将检测结果与作者之前报道的冬虫夏草数据进行对比分析。对比研究表明,不同冬虫夏草替代品在稳定碳同位素比值、粗脂肪含量和脂肪酸组成上存在明显差异;冬虫夏草替代品的粗脂肪和不饱和脂肪酸含量低于冬虫夏草,显现出冬虫夏草的不可替代性;稳定碳同位素比值和脂肪酸组成是冬虫夏草替代品掺杂判识的两类重要标志。 相似文献
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中华鳖肌肉和裙边挥发性风味成分分析 总被引:4,自引:2,他引:4
采用同时蒸馏萃取法(simultaneous distillation extraction,SDE)提取中华鳖肌肉和裙边中的挥发性风味物质,采用气相色谱质谱联用法(GC-MS)进行分离鉴定。肌肉和裙边中共鉴定出53种化合物,包括含N、S化合物(23种)、酮类(7种)、醛类(6种)、芳香族化合物(5种)、醇类(4种)、酯类(3种)、烷烃类(3种)、酸类(2种)。对比肉类挥发性风味成分的阈值,对中华鳖肌肉风味贡献较大的主要成分为乙酸乙酯、2,3-丁二酮、2,3-戊二酮和3-羟基-2-丁酮。裙边的主要挥发性风味成分为乙酸乙酯、3-甲基-2-丁醇、壬醛、2,4-癸二烯醛和辛醛。 相似文献
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BackgroundChronic and degenerative diseases have become major concerns in healthcare and research sectors in the world, especially in hyper-ageing societies. The role of diet in healthy ageing is much emphasised leading to more research on exploring the scientifically backed functional properties of conventional foods. Centella asiatica (Gotu kola) is a herbal plant that is highly valued as a medicine and also commonly used in a variety of cuisine as a green leafy vegetable.Scope and approachThis paper reviews available evidence on health benefits of C. asiatica especially emphasising its role as a neuroprotectant, while providing details on its phytochemistry and pharmacological properties.Key findings and conclusionsComplementing its reputation in traditional medicine as a memory booster, C. asiatica possesses wholesome anti-oxidative properties to attenuate oxidative stress, a high anti-inflammatory potent, neuron regenerative ability, potential for neuron damage prevention, neurotoxicity inhibition effect, anti-anxiety and anti-depressive properties, AChE inhibitory potential and ability to reduce accumulation of amyloid plaques. These comprehensive multifunctional properties make it capable of promoting general neuroprotection as well as simultaneously targeting multiple disease pathways to arrest neurodegenerative disorders. However, to be used as a therapeutic agent, a proper evaluation should be done of the active ingredients, presence of any synergistic effects, efficient extraction methods and stabilization of the active ingredients until they are delivered in the body as well as the potential of active ingredients to reach targeted pathological pathways, especially the ability to cross the blood-brain barrier (BBB). 相似文献
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The capacity of 12 lactic acid bacteria (LAB) strains to preserve porcine blood during storage was evaluated. A general ability of LAB to prevent blood's hemolysis and to maintain the functional properties of plasma was observed. Two strains, PS99 (Enterococcus raffinosus) and TA43 (Lactobacillus reuteri), were selected for studies at 5°C according to their antibacterial activity in blood stored at 15°C. After 144h at 5°C, lower counts of coliforms, Pseudomonas spp., proteolytic and hemolytic bacteria were obtained in blood containing either PS99 or TA43 as compared to the non-inoculated blood. When inulin (2%) was added to blood, higher inhibition values were obtained and Enterococcus raffinosus (PS99) showed the best abilities for blood preservation. On the basis of these results it seems worthwhile to supplement blood with inulin and to inoculate it with an active LAB strain to avoid undesirable changes during chill storage, especially useful to prevent the effects of a cold-chain breakdown. 相似文献
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目的:为了研究皂荚籽干燥特性,为其机械化剥离应用提供理论参考。方法:研究了不同温度(70、90、110与130℃)与不同预处理方法(清水、碳酸氢钠溶液、焦磷酸二氢二钠溶液和酒石酸氢钾溶液浸泡)对皂荚籽干燥动力学的影响,使用Lewis模型、Page模型与Weibull分布函数对其干燥特性曲线进行非线性拟合并进行评价,并通过应面回归模型建立起干燥动力学模型。结果:皂荚籽干燥过程存在明显的升速降速段,且干燥温度越高,干燥速率越快,预处理方法对其干燥速率有一定影响。通过比较各模型的分别是决定系数()、卡方检验值()、残差平方和()与均方根误差(),结果显示Weibull分布函数能更好地模拟皂荚籽干燥过程,形状参数()随温度的升高而降低,尺寸参数()与预处理方法有关。计算了皂荚籽干燥过程的有效水分扩散系数()及其估算值()与活化能(),水分扩散系数及其估算值随着温度的升高而升高,经过酒石酸氢钠溶液预处理的皂荚籽的活化能低于其它预处理方法,可大大提高皂荚籽干燥效率。结论:经碳酸氢钠溶液预处理的皂荚籽干燥较容易发生,Weibull函数能较好地描述皂荚籽干燥过程中水分含量的变化规律,酒石酸氢钠溶液可以降低皂荚籽的活化能。该研究可为皂荚籽干燥提供理论和技术基础。 相似文献