HPLC法同时测定枣叶中5种黄酮的含量

建立了一种枣叶中黄酮类成分定量分析的HPLC方法,并对14个品种的大枣及酸枣叶中这5种黄酮的含量进行了分析。结果得到采用Hypersil BDS C18色谱柱,以乙腈与0.1%甲酸水溶液为流动相梯度洗脱,流速1 m L/min,柱温30℃,检测波长360 nm,实现了槲皮素-3-O-洋槐糖苷、芦丁、槲皮素-3-O-β-D-葡萄糖苷、山奈酚-3-O-芸香糖苷、槲皮素-3-O-α-L-阿拉伯糖-(1→2)-α-L-鼠李糖苷5种黄酮苷的同时检测,最低检出限为1.44~2.59μg/m L,加标回收率在93.8%~105.9%之间。5种黄酮苷的含量测定结果表明不同品种的枣叶中黄酮类成分的组成和含量差异较大,其中芦丁和槲皮素-3-O-洋槐糖苷的含量较高,平均为7.83 mg/g D.W和4.61 mg/g D.W;8个品种枣叶中检测到槲皮素-3-O-α-L-阿拉伯糖-(1→2)-α-L-鼠李糖苷,平均5.32 mg/g D.W;而槲皮素-3-O-β-D-葡萄糖苷和山奈酚-3-O-芸香糖苷的含量较低,分别为0.14 mg/g D.W和0.41 mg/g D.W。     

不同产地苦荞麦中黄酮类成分的含量测定与分析

建立苦荞麦中芦丁、槲皮素、山奈酚、山奈酚-3-o-芸香糖苷4种黄酮类成分的含量测定方法,比较不同产地苦荞麦中黄酮类成分的含量差异。采用高效液相色谱法(high performance liquid chromatography,HPLC)测定不同产地苦荞麦样品中黄酮类成分的含量,采用统计学方法分析不同产地4种成分含量的差异。方法学考察中线性范围、精密度、稳定性、重复性及加标回收试验均符合规定,云南产苦荞麦中槲皮素、山奈酚含量明显高于其他产地,芦丁、山奈酚-3-o-芸香糖苷含量相差不大。该方法可用于苦荞麦中黄酮类成分的含量测定,为苦荞麦原料的采购提供技术依据。     

不同来源的苦荞茶中4种黄酮的含量测定

采用HPLC法同时测定不同来源的苦荞茶中芦丁、山柰酚-3-O-芸香糖苷、槲皮素和山柰酚四种成分含量,并比较差异。应用PLATISIL ODS(250 mm×4.6 mm,5μm)柱,流动相为甲醇-0.1%磷酸溶液,梯度洗脱,检测波长为355 nm,流速为1.0 m L/min,柱温为30℃。结果,不同来源的苦荞茶中,4种黄酮类成分含量差别很大。以果实制作的苦荞茶,芦丁、山柰酚-3-O-芸香糖苷的含量明显高于以皮层或全株制作的苦荞茶,而后者的槲皮素、山柰酚含量又明显高于前者。结果提示,以果实制作的苦荞茶含黄酮苷较多,更适宜冲饮。     

木槿花瓣中的总黄酮成分及抗氧化能力分析

为阐明木槿花瓣中总黄酮的成分及其抗氧化性,本研究利用液质联用技术,通过DPPH、ABTS+自由基清除实验,对木槿花瓣中的总黄酮成分及抗氧化能力进行分析。结果表明:木槿花瓣中含有芹菜素-C-二葡萄糖苷、芹菜素-7-O-芸香糖苷、牡荆苷、山奈酚-O-六碳糖-C-六碳糖苷、圣草酚-7-O-葡萄糖苷、山奈酚-3-O-丙二酰葡萄糖苷-7-O-葡萄糖苷、木犀草素-7-O-葡萄糖苷、麦黄酮-O-丙二酰基-己糖苷、木犀草素-7-O-6-丙二酰基半乳糖苷这9种黄酮类化合物;‘红心’、‘紫色法国酒馆’、‘红色法国酒馆’、‘蓝莓冰沙’和‘牡丹’5个品种的木槿花均具有较好的抗氧化性,以DPPH自由基清除率和ABTS+自由基清除率为指标其等效Trolox当量分别为35.51、49.13、50.28、49.99、49.34 mg Trolox/g（干重）和20.23、27.83、44.11、29.79、35.53 mg Trolox/g（干重）;在影响抗氧化能力因素方面,总黄酮含量是影响木槿花抗氧化性的主要因素,在具体成分中牡荆苷、山奈酚-O-六碳糖-C-六碳糖苷、圣草酚-7-O-葡萄糖和麦黄酮-O-丙二酰基-己糖苷是影响木槿花抗氧化性主要的总黄酮成分。本研究表明木槿花中含有多种生物活性成分和抗氧化能力。     

苦荞麸皮黄酮提取物及有效成分的抑菌活性

研究苦荞麸皮总黄酮粗品及精品对病原菌的抑制作用,并初步分析其黄酮类成分,评价不同黄酮单体的抑菌活性。通过平板打孔法及二倍稀释法检测苦荞麸皮总黄酮粗品及精品及其4种黄酮单体的抗菌活性,使用高效液相色谱法定性定量检测苦荞麸皮总黄酮粗品及精品的黄酮成分。结果表明,苦荞麸皮黄酮精品对金黄色葡萄球菌、藤黄微球菌、肠球菌、大肠杆菌、志贺氏杆菌、沙门氏菌的抑制效果优于粗品。苦荞麸皮黄酮主要黄酮成分为芦丁、山奈酚-3-O-芸香糖苷、槲皮素和山奈酚,精品的总黄酮含量是粗品总黄酮含量的2.84倍。4种黄酮单体的抑菌能力具有一定的构效关系,其中槲皮素对所有供试菌均表现出较好的抑菌活性。     

甜叶菊花和叶中酚类成分分析及含量测定

以高效液相色谱-串联四极杆质谱分析仪,结合质谱分析及比对对照品或文献报道化合物的保留时间和质谱参数,在甜叶菊花和叶中鉴定了16种酚类化合物。建立一种利用高效液相色谱法测定甜叶菊中16种酚类化合物含量的方法,并对甜叶菊一新品种盛花期花和叶中酚类的含量进行测定。结果表明,甜叶菊花和叶中酚酸化合物以新绿原酸、绿原酸、隐绿原酸、异绿原酸B、异绿原酸A、异绿原酸C为主,异绿原酸A含量最高,绿原酸含量次之;花和叶中类黄酮化合物主要为芦丁、槲皮素-7-O-葡萄糖苷、木犀草素-7-O-葡萄糖苷、木犀草素-7-O-芸香糖苷、槲皮素-3-O-木糖苷、槲皮素-3-O-鼠李糖苷、芹菜素-7-O-葡萄糖苷、山奈酚-3-O-阿拉伯糖苷、山奈酚-3-O-鼠李糖苷,槲皮素-3-O-鼠李糖苷含量最高;盛花期甜叶菊花和叶中酚类总量达（22.31±0.51）mg/g和（91.11±2.32）mg/g。     

UPLC-QQQ/MS法分析比较不同品种苦荞麦代表性成分含量

建立超快速液相色谱-三重四极杆质谱联用技术(UPLC-QQQ/MS)同时测定川荞1号、西荞1号、米荞1号、迪苦4个不同品种苦荞麦中6种代表性成分含量的方法,并对不同品种之间含量差异进行分析与评价。所测6种成分葫芦巴碱、芦丁、山奈酚-3-O-芸香糖苷、槲皮素、山奈酚、大黄素在测定质量浓度范围内具有良好的线性关系,方法精密度、重复性和稳定性良好,加样回收率为95.27%～107.31%。4个品种苦荞麦成分含量存在显著性差异的主要为黄酮类成分,其在米荞1号中含量最高,远高于川荞1号和西荞1号(P 0.01)。方法简单、快速、准确度及灵敏度高,可用于不同品种苦荞麦6种成分的测定,为不同产地、不同品种苦荞麦质量评价提供新的技术参考。     

月桂叶中黄酮类成分的分析鉴定

利用液相色谱-四级杆-飞行时间串联质谱(LC-Q-TOF-MS),结合标准品比较、保留时间对比、多级质谱碎片和相关文献,鉴定了月桂叶黄酮的化学成分。利用液相-三重四级杆串联质谱(LC-MS/MS)在多反应监控模式(MRM)下,分别测定了黄酮化合物的含量。从我国月桂叶中分离鉴定出了16种黄酮化合物,包括牡荆素鼠李糖苷(1658.53μg/g±56.9)、芦丁(19883.54±494.33μg/g)、牡荆素(4430.87±89.72μg/g)、A-型原花青素三聚体(2281.88±78.90μg/g)、表儿茶素(148.10μg/g±2.32)、山奈酚-3-O-芸香糖苷(3491.02±47.98μg/g)、异鼠李素-3-O-芸香糖苷(6643.78±99.04μg/g)、金丝桃苷(11979.66±317.79μg/g)、山奈酚-7-O-葡萄糖苷(738.55μg/g±10.86)、紫云英苷(508.60μg/g±6.96)、槲皮素-3-O-木糖苷(2044.22μg/g±57.65)、异鼠李素-3-O-葡萄糖苷(2079.94μg/g±76.38)、槲皮苷(2079.94μg/g±61.84)、山奈酚-3-O-鼠李糖苷(6412.37±78.65μg/g)、槲皮素(1629.45μg/g±47.65)和山奈酚(364.29μg/g±2.84)。测定了月桂叶黄酮提取物清除DPPH自由基的能力,结果证明,月桂叶黄酮具有良好的清除自由基能力。     

白鲜皮黄酮类物质分析、富集及在卷烟中的应用

建立了白鲜皮提取物中芦丁、槲皮素、木犀草素、山奈酚和异鼠李素5种黄酮物质通过高效液相色谱法检测的方法,来分析白鲜皮来源对其黄酮物质含量的影响;并采用AB-8型大孔树脂对白鲜皮提取物中黄酮类成分进行富集,评价富集后的白鲜皮提取物在卷烟中的应用效果。试验采用ZORBAX ECLIPSE PLUS C18色谱柱(250mm×4.6 mm,5μm),流动相A相为0.35%乙酸水溶液,流动相B相为75%甲醇水溶液,梯度洗脱,流速为0.80 m L/min,VWD检测波长为283 nm,柱温为35℃。检测方法显示:5种黄酮物质测得的线性范围为0.05~500 mg/L;检出限(S/N=3)在0.004~0.08 mg/kg之间,加标回收率(N=6)在85.96%~107.52%之间,检测方法灵敏有效。检测结果表明,不同来源白鲜皮得到的白鲜皮提取物中芦丁、槲皮素、木犀草素、山奈酚、异鼠李素5种白鲜皮提取物黄酮物质的总含量以辽宁朝阳产白鲜皮提取物最高。经大孔树脂富集后,各产地白鲜皮黄酮类物质含量显著增加。卷烟加香应用结果表明,辽宁朝阳产白鲜皮提取物经大孔树脂富集后,能与烟香协调,增加烟气圆润、绵长感,改善余味。     

鱼腥草浸泡酒的工艺研究

利用高效液相色谱（HPLC）和紫外可见分光仪（UV）,以黄酮（山奈酚-3-O-葡萄糖苷、芦丁、金丝桃苷、槲皮苷、槲皮素、山奈素和异鼠李素）和多酚为考察指标,以乙醇体积分数、液固比和浸泡时间3个因素进行响应优化,研究鱼腥草泡酒的最佳工艺。结果表明,鱼腥草浸泡酒的最佳提取工艺为乙醇55%vol、液固比10∶1（mL/g）、存放时间40 d,山奈酚-3-O-葡萄糖苷、芦丁、金丝桃苷、槲皮苷、槲皮素、山奈素和异鼠李素和多酚理论含量分别为333.6 mg/L、157.4 mg/L、67.3 mg/L、137.3 mg/L、44.8 mg/L、161.7 mg/L、54.6 mg/L和1920.6 mg/L。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.