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[目的]基于超高效液相色谱–四极杆飞行时间–质谱(UHPLC–QTOF–MS)技术分析五倍子中单宁成分,建立一种有效的五倍子单宁成分测定方法,并解析单宁的裂解规律。[方法]使用高温和超声波辅助方法提取五倍子中的酚类化合物,基于二级质谱推定化合物的裂解途径。[结果]共鉴定到20种化合物,包含14种没食子单宁、3种酚酸、2种没食子酸酯和1种黄烷醇。以高温121℃为提取条件,均未鉴定到分子质量高于1 500 Da的没食子单宁,而在超声波辅助提取的五倍子水提取液中,成功地检测到1–O–没食子酰基葡萄糖至14–O–没食子酰基葡萄糖,其中,超声功率1 500 W,提取温度65℃条件下,鉴定到更多的没食子单宁异构体。MS/MS图谱显示,五倍子单宁主要通过没食子酸、没食子酰基、糖苷、水、羧基的损失进行裂解。[结论]本研究证明,超声波辅助提取条件下,应用UHPLC–QTOF–MS技术能够全面高效地分析五倍子中的单宁成分,本研究为富含单宁的植物的化学成分研究提供参考依据。 相似文献
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Min-Jay Chung Sen-Sung Cheng Chun-Ya Lin Shang-Tzen Chang 《Journal of Wood Science》2018,64(6):823-835
Volatile organic compounds (VOCs) released from Chamaecyparis formosensis, Cryptomeria japonica, Cunninghamia lanceolata, Chamaecyparis obtusa var. formosana, and Taiwania cryptomerioides five major building and interior decoration timbers and their essential oil components were analyzed using GC–MS and TD/GC–MS/FID. Results showed that C. obtusa var. formosana had the highest yield of essential oil (3.42%), followed by C. formosensis (3.14%), while C. japonica had the lowest yield (0.95%). Moreover, oxygenated sesquiterpene was the highest relative content in all five essential oils and their main constituents were trans-myrtanol (18.04%), 1-epi-cubenol (15.99%), cedrol (62.26%), α-cadinol (26.42%), and α-cadinol (27.98%), respectively. In terms of emission quantity of top VOC, the results showed the decreasing order of C. formosensis (myrtenal, 74.21 mg/m2)?>?T. cryptomerioides (thujopsene, 12.00 mg/m2)?>?C. lanceolata (α-cedrene, 10.27 mg/m2)?>?C. obtusa var. formosana (α-pinene, 8.05 mg/m2)?>?C. japonica (α-cedrene, 4.25 mg/m2). C. formosensis had a greater amount of VOCs emitted and hence gave off more fragrance than C. obtusa var. formosana initially. However, after indoor exposure of 24 weeks, the VOC emission quantity of C. obtusa var. formosana exceeded that of C. formosensis. α-Cedrene and thujopsene were the top two major VOCs of both C. lanceolata and T. cryptomerioides. However, they both showed a trend of decrease in emission with prolonged exposure. All five plantation timbers showed good antifungal, antimicrobial, antibacterial, and antitermitic properties, making them ideal materials for interior decoration. Not only do they have strong bioactivities, they can also provide a fragrant and healthy living environment. 相似文献
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樟树叶化学成分的GC/MS分析 总被引:2,自引:0,他引:2
樟树为亚热带地区重要的材用和特种经济树种,在我国大面积栽培。樟树叶是可再生的生物资源,但具有高附加值开发潜力的化学组分还未被深入研究,阻碍了樟树的综合开发利用。首次采用GC/MS联用技术研究樟树叶的高品位综合利用前景及途径。新鲜樟树叶经微波干燥除水,粉碎后于苯/醇溶液中进行提取处理,提取物滤液经浓缩后,取0.2μL样品进行GC/MS联机分析,采用色谱峰面积归一化法计算各组分的相对含量。分析结果表明,樟树叶的苯/醇提取物中富含名贵生物医药、名贵香料、以及大宗化工成分,首次发现樟树叶中富含总含量达13.06%的烯类物质,具有很好的高品位综合开发利用前景。 相似文献
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箬竹叶挥发性成分的GC—MS分析 总被引:12,自引:0,他引:12
采用水蒸汽蒸馏,GC-MS联用技术,对知竹叶挥发性成分进行提取、分离和鉴定,共分出了47个色谱峰,鉴定了其中的43种成分,占挥发性成分总量的96.45%,含量最高的为4-乙烯基苯酚,含量为15.26%,其次为3-已烯酸,含量为10.06%。在43种成分中醛类化合物共有在2种,其含量占挥发性成分总量的27.49%,羧酸类化合物8种,其含量占挥发性成分总量的23.54%。 相似文献
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Michael Bücker Christian Jäger Dietmar Pfeifer Brita Unger 《Wood Science and Technology》2014,48(5):1033-1047
The present study contributes to the controversial discussion in the literature whether Si–O–C bonds in wood–silica–gel composites exist. 13C NMR is a suitable method to proof such bonds. Because of the low concentration of 13C isotopes in natural wood, 13C cellulose was used as 13C-enriched substitute. A tailored sol for the impregnation of that cellulose was chosen by liquid 29Si NMR pre-investigations of various sols whose reactivity and stability were time-dependently analysed. It is based on a sub-stoichiometric hydrolysis of tetraethoxysilane (TEOS) with 1 mol water per mol TEOS. Thermal analyses were performed to show a comparability of the thermal behaviour of wood–silica–gel and cellulose–silica–gel composites. There are two strong hints of the existence of stable Si–O–C bonds: (1) by thermal analysis, a shift in the fire behaviour of 100 K can be observed with a change in pyrolysis behaviour of the composite and (2) the proof by REDOR NMR that a dipolar coupling between 29Si and 13C nuclei exists. 相似文献
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采用水蒸气蒸馏法从10批水杉种子中提取挥发油,采用气相色谱—质谱联用技术(GC-MS)分析挥发油的主要化学成分及其相对含量,建立水杉种子的GC/MS指纹图谱。结果表明:水杉种子挥发油主要含有8个共有特征峰,各峰的相对保留时间基本一致(RSD<0.5%),其相关系数(≥94%)、相似度(≥90%)、夹角余弦(≥95%)、相似性比(≥0.89)均达良好水平。本指纹图谱具有较好的特征性,能够反映产地差异情况,可用于水杉种子的质量鉴别。 相似文献
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