利用大孔吸附树脂纯化葛根异黄酮的研究

对 6种商品化大孔树脂吸附纯化葛根异黄酮的性能进行对比筛选 ,发现AB 8树脂最适合葛根异黄酮的纯化。试验结果表明 ,洗脱剂乙醇的体积分数为 70 % ,工作液流速为2BV/h ,浸提浓缩液 pH值为 5时 ,采用AB 8大孔吸附树脂串联柱对葛根异黄酮进行纯化效果最优 ,产品的收率和纯度都较高     

葛根中异黄酮的提取与纯化工艺研究

本文研究了葛根中异黄酮的最优浸提条件和最佳工艺参数,并对提取液的纯化条件进行了研究,最后对纯化产物进行了定性鉴定。结果表明:乙醇浸提法的最佳提取工艺参数为:料液比1:8、75%乙醇、温度70℃、提取时间2.0h;水提取法的最佳浸提工艺参数为:料液比1:10,浸提时间3h,浸提温度100℃,提取次数3次。葛根中异黄酮的纯化采用氯化钠盐析法,醇提液的纯化产率可达4.96%,产品含量为33.84%;水提液的异黄酮产率为6.45%,含量为10.50%。     

大孔吸附树脂分离纯化大豆荚壳异黄酮的研究

研究了分离纯化大豆荚壳异黄酮的最佳树脂型号及最佳工艺。通过静态吸附、动态吸附与解吸相结合的方法,以大豆荚壳异黄酮吸附量、解吸率为评价指标,综合评判确定最优工艺。结果表明,HPD100树脂分离纯化效果最好,其最优吸附条件为:上样液质量浓度为1.6 mg/mL,上样pH 4.1,上样流速为1.5 mL/min。最优洗脱条件为:6 BV,80%的乙醇溶液,洗脱流速为0.5 mL/min,精制后异黄酮的质量分数由原来的2.56%提高到60.7%。采用此工艺精制大豆荚壳异黄酮,操作简单,生产周期短,有较高的工业应用价值。     

葛根异黄酮的提取方法与应用

葛根异黄酮作为葛根的主要有效成分，其应用范围广泛。本文详细介绍了葛根异黄酮的组成、提取方法、纯化方法及在食品、医药、日用化工等工业中的应用。     

HPD-600大孔吸附树脂纯化大豆异黄酮工艺条件研究

研究HPD-600型大孔吸附树脂纯化大豆异黄酮吸附动力学特性,确定其工艺参数如下:上样液浓度为0.15mg/mL,上样液pH值为5,上样量为4.5BV,吸附流速为1.0ml/min,静态吸附250min,再用80%乙醇作为解吸剂,解吸流速为0.5ml/min。     

葛根异黄酮的提取方法与应用

葛根异黄酮作为葛根的主要有效成分,其应用范围广泛。本文详细介绍了葛根异黄酮的组成、提取方法、纯化方法及在食品、医药、日用化工等工业中的应用。     

大豆异黄酮精制工艺研究

试验比较10种不同型号大孔树脂对大豆异黄酮吸附性质和不同溶剂萃取大豆异黄酮效果,确定HPD-600树脂吸附纯化大豆异黄酮最佳工艺条件如下:上样液浓度0.15mg/mL、上样液pH值4～5、上样量4.5BV、吸附流速1.0ml/min、静态吸附250min,用80%乙醇作为解吸剂,解吸流速为0.5ml/min,3.0BV解吸剂即可解吸完全。得到大豆异黄酮粗品含量为20.11%,比粗提物纯度提高7.18倍;同时得出丙酮沸点回流萃取可得到含量为42.91%大豆异黄酮产品,纯度比含量为20.11%原料提高2.13倍;乙酸乙酯和丙酮组合沸点回流萃取,可得到含量为70.36%大豆异黄酮产品,纯度比含量为42.91%原料提高1.64倍。     

LSA-10型树脂纯化大豆异黄酮工艺条件的研究

对5种树脂吸附纯化大豆异黄酮的性能进行对比，发现LSA-10型树脂最适合大豆异黄酮的纯化。通过对影响树脂吸附解吸的各种因素进行系统的研究，确定的工艺参数如下：上柱液浓度0.1mg／mL，上柱液pH值4～5，上柱量4.0BV，吸附流速1.5mL／min，静态吸附4h，然后用水洗去糖等杂质，再用75％乙醇作为解吸剂，解吸流速为0.7mL／min。结果表明，大孔吸附树脂法是一种经济、快速、理想的分离大豆异黄酮的方法。     

葛根多糖纯化工艺及其抗氧化性能研究

目的:以葛根为原料,采用大孔树脂法分离纯化葛根多糖,研究其抗氧化性质。方法:通过对葛根多糖吸附及解吸筛选出最优树脂,分析吸附解吸时间、样液浓度、样液pH以及乙醇的体积分数对多糖纯化的影响,在静态分析条件下再运用层析柱法进行动态纯化,对纯化后的葛根多糖进行抗氧化分析。结果:D101树脂分离纯化效果较好,其对葛根多糖静态吸附和解吸最佳工艺条件吸附时间为8 h,解吸时间为3 h,吸附浓度0.75 mg/mL,样液pH6.0,乙醇解吸体积分数为60%,其对动态吸附和解吸最佳工艺条件为上样液质量浓度1.0 mg/mL,解吸剂体积(60%乙醇)51 mL,在此条件下纯化的葛根多糖纯度达到55.34%。经纯化后的葛根多糖对DPPH·和·OH具有较强的清除作用,最大清除率分别为81.74%和85.11%。结论:大孔树脂法纯化葛根多糖工艺条件合理,且纯化效果好,杂质去除率高,纯化后的葛根多糖抗氧化性得到提高。     

LSA-10型树脂纯化大豆异黄酮工艺条件的研究

对 5种树脂吸附纯化大豆异黄酮的性能进行对比 ,发现LSA - 10型树脂最适合大豆异黄酮的纯化。通过对影响树脂吸附解吸的各种因素进行系统的研究 ,确定的工艺参数如下 :上柱液浓度 0 1mg/mL ,上柱液 pH值 4～ 5 ,上柱量 4 0BV ,吸附流速 1 5mL/min ,静态吸附 4h ,然后用水洗去糖等杂质 ,再用 75 %乙醇作为解吸剂 ,解吸流速为 0 7mL/min。结果表明 ,大孔吸附树脂法是一种经济、快速、理想的分离大豆异黄酮的方法。     

葛根营养粉的研制

以葛根为主料,辅以大米、玉米等制备葛根营养粉。对葛根进行深加工,探讨护色液质量浓度、葛根熟化方法、粉碎粒度等葛根全粉的制备工艺条件以及葛根营养粉的配方。结果表明：制备葛根全粉的适宜制备工艺条件为采用0.1g/100mL柠檬酸溶液作为护色剂、105℃蒸汽蒸制15min、60℃热风干燥、粉碎后过100目筛;葛根营养粉的最佳配方为葛根全粉56%、白砂糖20%、麦芽糊精10%、大米粉7.2%、玉米粉4.8%、β-环状糊精2%。制得的葛根营养粉成品感官优良、冲调性好。     

Molecular Structure of Starch from Pueraria lobata (Willd.) Ohwi Relative to Kuzu Starch

The molecular structures of starches from Pueraria lobata (Willd.) Ohwi were examined and compared with those of other tuberous and root starches. The fresh tubers were collected from three Chinese main Pueraria lobata (Willd.) Ohwi growing regions. The chain distributions of the amylopectins as determined by gel permeation chromatography were similar to those of the amylopectins of other starches. Among the three amylopectins studied, the respective β‐amylolysis limits were 55%, 56% and 58% which were similar to that of kuzu amylopectin. The number average degree of polymerization ( ) values of the amylopectins were 8.7‐9.7×10³, lower than those of sweet potato and potato amylopectins (9.9×10³ and 11.2×10³, respectively). The number of branch chains per amylose molecule was 5.0. The average chain length ( ) of the Pueraria lobata (Willd.) Ohwi amyloses was similar to those of kuzu (310), sweet potato (310) and tapioca amyloses (340), but lower than those of lily (475) and potato (670).     

葛根及葛根素脑保护作用的研究进展

葛根为我国传统的药食两用植物,葛根素为其主要药效成分之一。依据中医药理论,葛根具有解表退热、生津止渴的功效。现代药理学研究表明,葛根及葛根素均具有显著的脑保护活性,对阿尔茨海默病、帕金森病及脑卒中等模型动物或细胞产生保护作用,其机制与调节GSK-3β/Nrf2、PI3K/Akt、cAMP/PKA等神经细胞凋亡信号转导通路有关。提示葛根具备开发为抗神经系统疾病保健食品的潜在价值。     

物理场强化葛根总黄酮提取的研究

本实验以乙醇为溶剂,研究了超声功率、超声作用时间以及微波作用功率、作用时间对葛根总黄酮提取率的影响,结果表明,适当的超声场和微波辐射可提高葛根总黄酮的提取率。     

中心组合设计优化野葛糖化工艺

以野葛为原料,采用葡萄糖当量值（DE值）为评价指标,在单因素试验的基础上,利用中心组合设计试验优化野葛糖化工艺条件并建立回归方程。结果表明,野葛糖化的最佳工艺参数依次为酶解时间220 min、pH 4.2、酶添加量528 U/g、酶解温度58 ℃。在此工艺条件下糖化液DE值可达到（79.93±0.20）%。     

野葛细胞固定化培养及异黄酮化合物的生产

以海藻酸钠固定化处理的野葛细胞为试材,研究了固定化细胞培养周期中细胞生长、糖源消耗和异黄酮含量的变化。结果表明,野葛细胞生长曲线呈“S”形,可分为3个主要阶段,即迟滞期(0~8 d)、指数生长期(8~14 d)和稳定增长期(14~18 d)。在培养的第18天达到最大生物量(48.56 g(FW)/L),约为初始接种量的3.04倍。同时,糖源随细胞生长量的增加而不断消耗。在野葛细胞培养周期中,固定化细胞胞内黄酮和培养液黄酮逐渐累积,培养体系中的总黄酮含量与细胞生长量呈同步增长的关系,第16天,总黄酮含量约为初始培养时的17.28倍。试验结果为采用野葛细胞固定化培养的方法进行异黄酮化合物的生产提供了实验依据。     

葛根直链淀粉和支链淀粉分离纯化的研究

用重结晶的方法对葛根淀粉中直链淀粉和支链淀粉组分进行分离和纯化，并利用碘亲和力测定，凝胶过滤层析，Ｘ－射线衍射等方法对产品的纯度进行了鉴定。结果表明通过重结晶８次可得到完全纯化的葛根直链淀粉；反复３次加入正丁醇去除残留的直链淀粉可得到完全纯化的葛根支链淀粉。     

Physicochemical,crystalline, and thermal properties of native and enzyme hydrolyzed Pueraria lobata (Willd.) Ohwi and Pueraria thomsonii Benth. starches

Starches isolated from the bulbs of Pueraria lobata (Willd.) Ohwi (PLO) and Pueraria thomsonii Benth. (PTB) were hydrolysed by glucoamylase for different lengths of time (2, 4, 8, 12, and 24 h). The hydrolysis results were compared by scanning electron microscope (SEM), X‐ray power diffractometer (XRD), and differential scanning calorimetry (DSC). The SEM results revealed that both of the PLO and PTB starches showed the same hydrolysis mechanism, which indicated that the glucoamylase primarily attacking the exterior of starch granules and then the interior. The results of XRD revealed the crystalline type of PTB starch changed from C‐type to A‐type with crystallinity reducing from 43.5 to 20.9% during the hydrolysis. Unlike PTB starch, the PLO starch did not show marked changes in crystalline style but lower degree of crystallinity was obtained from 32.4 to 13.7% during the hydrolysis. All the XRD results demonstrated that B‐type polymorph was preferentially degraded than A‐type polymorph in the C‐type starch. The DSC results revealed that both of the PLO and PTB starches showed decreased enthalpy of gelatinization (ΔH_gel) and gelatinization temperature range (R)‐value after hydrolysis, while the gelatinization temperature (T_p) indicated different tendency, initially ranging from 68.6 to 64.3°C and then increasing to 67.8°C for PLO starch. While for PTB starch, the T_p‐value showed progressive reduction from 85.4 to 74.3°C during the whole process.     

配位色谱分离染料木素和大豆苷元单体

目的建立中药葛根中的染料木素和大豆苷元的配位色谱分离方法。方法：葛根提取物与0．1M的Ni^2＋溶液混合，硅胶柱干法分离。氯仿甲醇梯度洗脱。结果：染料木素和大豆苷元与常法柱层析的分离次序相反，纯度达到95％以上。结论该法绿色环保，简单可靠。     

Comparison of Antioxidant Activities of Isoflavones from Kudzu Root (Pueraria lobata Ohwi)

ABSTRACT: Isoflavones and their glycosides were isolated from kudzu root, and formononetin-7- O -glucoside (ononin) was identified from the plant for the first time. Among isolated compounds, the antioxidant potency of 5 major compounds was determined using (1) 2,2-diphenyl-1-picrylhydrazyl free-radical scavenging assay, (2) thiocyanate assay in the linoleic acid model system, and (3) lipoxygenase inhibition assay. The study indicates that 5 compounds act as free-radical scavengers and inhibit both linoleic acid peroxidation and lipoxygenase activity. The 3 different assays for determining antioxidant activity revealed that activity in one test did not necessarily correlate with activity in another test. Arachidonic acid release in the intact HL-29 cancer cell, biochanin A, showed strong inhibition of about 70%, at a concentration of 50 μ.M.