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Guido C Galletti Alberta Carnacini Andrea Antonelli Giovanni A Farris 《Journal of the science of food and agriculture》1996,70(1):44-50
Forty compounds were identified by gas chromatography and gas chromatography/mass spectrometry in the volatile fraction of Vernaccia di Oristano, an Italian sherry-like wine produced in Sardinia since the 11th century. The individual aromatic compounds were identified and quantified in the original wine, both after biological ageing by inoculation of the original wine with Saccharomyces cerevisiae var bayanus and S cerevisiae var prostoserdovii , and after ageing under sterile conditions. The effects of flor yeasts in terms of production or subtraction of flavour components are discussed. 相似文献
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高效液相色谱-串联质谱法测定茶叶中草甘膦残留量的不确定度评价 总被引:2,自引:0,他引:2
对茶叶中草甘膦残留量的高效液相色谱.串联质谱法测定过程进行了研究,分析测量过程的不确定度来源,并且对不确定度的各个分量进行评估和合成。结果表明,加标回收试验和标准物质纯度引入的不确定度分量是影响草甘膦残留量测定不确定度的主要原因。当茶叶中草甘膦残留量为0.67mg/kg时,扩展不确定度为0.026mg/kg,测定结果表示为X=(0.67±0.026)mg/kg,k=2,P=95%。 相似文献
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Association Between Modification of Phenolic Profiling and Development of Wine Color during Alcohol Fermentation 下载免费PDF全文
Si‐Yu Li Pei‐Tong Liu Qiu‐Hong Pan Ying Shi Chang‐Qing Duan 《Journal of food science》2015,80(4):C703-C710
To solve the problem of wine color instability in western China, different additives (the maceration enzymes Vinozym G and Ex‐color, yeasts VR5 and Red Star, and commercial tannins) were added during alcoholic fermentation of Syrah (Vitis vinifera L.). The phenolic profile and color characteristics of wine were examined using high performance liquid chromatography mass spectrometry and CIELAB, respectively. The results showed that the combination of the enzyme Ex‐color with the Red Star yeast eased the release of non‐anthocyanins from grape berries into wine, whereas the use of enzyme Vinozym G and VR5 yeast enhanced the concentration of anthocyanins and achieved a higher red hue (a* value) and a lower yellow hue (b* value) in the wine. The addition of commercial tannins greatly promoted the level of gallic acid in the wine and led to a relatively higher concentration of anthocyanins. Partial least‐squares regression analysis was used to find out the major phenolics, which were in close relation with color parameters; principal component analysis was used to evaluate the contribution of different winemaking techniques to wine color. The combination of these 2 analytic methods indicated that Vinozym G and VR5 yeast together with commercial tannins should be an appropriate combination to enhance the stability of wine color during alcohol fermentation, which was related to a significant increase in cyanidin‐3‐O‐(6‐O‐acetyl)‐glucoside, cyanidin‐3‐O‐(6‐O‐coumaryl)‐glucoside, trans‐peonidin‐3‐O‐(6‐O‐coumaryl)‐glucoside, trans‐malvidin‐3‐O‐(6‐O‐coumaryl)‐glucoside, and malvidin‐3‐O‐(6‐O‐acetyl)‐glucoside‐pyruvic acid, all of which played an important role in stabilizing wine color. 相似文献
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目的:建立一种简单、快速、准确的高效液相色谱-串联质谱法,同时分离与检测紫苏叶、茎和根中酚类化合物含量,探讨紫苏各部位酚类物质的累积规律,为确定紫苏各部位最佳采收时期提供依据。方法:对紫苏进行人工栽培,样品分期采集,采集后的样品经乙醇提取,采用高效液相色谱-串联质谱法进行分析,对影响色谱、质谱的重要参数进行优化,通过对照标准物质的保留时间及质谱分析,确定相应的化合物;通过标准曲线法定量,以其中13 种酚类化合物为主要参考指标,观察它们在各部位的动态含量变化。结果:鉴定出化合物:咖啡酸、咖啡酸-3-O-葡萄糖苷、迷迭香酸、迷迭香酸-3-O-葡萄糖苷、木犀草素、木犀草素-7-O-葡萄糖苷、木犀草素-7-O-葡萄糖苷酸、木犀草素-7-O-二葡萄糖苷酸、芹菜素、芹菜素-7-咖啡酰基葡萄糖苷、芹菜素-7-O-二葡萄糖苷、野黄岑素-7-O-二葡萄糖苷、迷迭香酸甲酯,以上化合物中酚酸及其糖苷化合物含量呈先降低,至结果期急剧上升达到最大,黄酮及其糖苷化合物含量则递增至结果期达到最大。其中鉴定出迷迭香酸和木犀草素-7-O-葡萄糖苷酸分别在结果期达到最大,含量分别为21.41 mg/g和19.89 mg/g,结果期叶部位总酚类含量达到最大,含量为47.50 mg/g。结论:通过对紫苏各个部位不同采收时期黄酮、黄酮糖基化、酚酸的动态变化、总含量变化和部位成分分布的研究,对紫苏酚类资源的利用提供参考依据。 相似文献
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目的研究利用固相提取净化、高效液相色谱-电喷雾串联三重四级杆质谱检测分析水中微囊藻毒素MC-LR和MC—RR。方法水样品经玻璃纤维滤纸过滤后,经C18固相提取柱富集净化,氮吹后定容。流动相中添加0.1%甲酸,采用梯度洗脱模式,经C18反相色谱柱分离,以电喷雾串联三重四级杆质谱定性、定量测定。结果线性定量范围0.1~5.0μg/kg,检测低限为MC-LR 0.01μg/kg,MC—RR 0.02μg/kg。结论此方法操作简便、定性定量能力较强,可作为检测水质量和评估食品安全风险的可靠方法。 相似文献
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Yutang Wang Yuanyuan Liu Chunxia Xiao Laping Liu Miao Hao Jianguo Wang Xuebo Liu 《Journal of food science》2014,79(6):C1100-C1105
This study established a new method for quantitative and qualitative determination of certain components in black rice wine, a traditional Chinese brewed wine. Specifically, we combined solid‐phase extraction and high‐performance liquid chromatography (HPLC) with triple quadrupole mass spectrometry (MS/MS) to determine 8 phenolic acids, 3 flavonols, and 4 anthocyanins in black rice wine. First, we clean samples with OASIS HLB cartridges and optimized extraction parameters. Next, we performed separation on a SHIM‐PACK XR‐ODS column (I.D. 3.0 mm × 75 mm, 2.2 μm particle size) with a gradient elution of 50% aqueous acetonitrile (V/V) and water, both containing 0.2% formic acid. We used multiple‐reaction monitoring scanning for quantification, with switching electrospray ion source polarity between positive and negative modes in a single chromatographic run. We detected 15 phenolic compounds properly within 38 min under optimized conditions. Limits of detection ranged from 0.008 to 0.030 mg/L, and average recoveries ranged from 60.8 to 103.1% with relative standard deviation ≤8.6%. We validated the method and found it to be sensitive and reliable for quantifying phenolic compounds in rice wine matrices. 相似文献
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为快速检测食品中的苏丹红1号,建立了一种快速准确的苏丹红1号液质联用测定方法。样品用乙腈提取,稀释定容后用液相色谱-质谱联用法测定,对HPLC-MS/MS的测定条件进行了研究和优化。回收率在90.5%~110.0%之间,多次测定的RSD在1.3%~7.2%之间,该方法的最低检出限低于10pg。该方法简便、快速、准确、灵敏,可以满足食品中苏丹红1号检测的需要。 相似文献
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高效液相色谱串联质谱法测定乳粉中低聚果糖 总被引:1,自引:0,他引:1
建立了测定乳粉中低聚果糖(蔗果三糖、蔗果四糖、蔗果五糖、蔗果六糖)的高效液相色谱串联质谱(HPLC-MS/MS)检测方法。乳粉样品用乙醇-水提取,上清液稀释后,采用XBridge TM Amide(3.5μm,4.6 mm×150 mm)柱,以乙腈-氨水溶液为流动相进行洗脱,电喷雾质谱负离子(ESI-),多反应监测(MRM)模式检测,外标法定量。该方法在0.5~20 mg/L范围线性良好(r0.9990,检出限最低为0.022 mg/kg)。分别在样品中添加标准物质1、5、10 mg/kg进行回收率实验,方法的回收率范围为90.8%~95.8%,相对标准偏差为3.6%~9.0%(n=6)。该方法样品前处理简单、快速,分析时间短,灵敏度、准确度和精密度均满足乳粉中低聚果糖的检测要求。 相似文献
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建立了纺织品中苯扎氯铵的高效液相色谱-串联质谱(HPLC-MS/MS)测试方法。结果表明,采用超声萃取的方法对纺织品中的苯扎氯铵进行提取,提取率可达85%以上。采用C18液相色谱柱,流动相采用0.1%甲酸水-甲醇体系溶液,质谱采用电喷雾离子源正离子模式电离,选择多反应监测(MRM)模式,在0.1~0.8 mg/L范围内具有良好的线性关系(R~2>0.999),平均加标回收率在83.04%~98.91%,相对标准偏差(RSD)小于4.61%。该方法的准确性和重复性好,灵敏度高,操作简便。 相似文献
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建立猪肉中糖皮质激素多残留的液相色谱串联质谱(LC-MS/MS)分析方法。样品经甲醇提取,固相萃取柱净化后采用LC-MS/MS 进行检测分析。对样品前处理条件和质谱参数进行研究,这些激素的物质的线性范围均为0.5~100μg/kg。低、中、高3 种质量浓度加标回收率均为78%~101%;最低检出限为0.2~2μg/kg。该方法快速简便,灵敏度高,选择性好,测定结果令人满意,可在各食品检测机构推广应用。 相似文献
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高效液相色谱串联质谱法测定蔬菜中苯醚甲环唑的残留量 总被引:1,自引:0,他引:1
建立高效液相色谱-串联质谱检测蔬菜中苯醚甲环唑残留的分析方法。样品采用乙腈提取,经石墨碳黑-氨基串联固相萃取(GCB/NH2 SPE)柱净化,液相色谱分离多反应监测模式下测定,外标法定量。结果显示:苯醚甲环唑质量浓度在1~500ng/mL范围内线性关系良好。苯醚甲环唑在不同基质中平均回收率为79.3%~108.0%,相对标准偏差为2.7%~8.5%,检出限为0.001mg/kg。该方法灵敏度高,准确度、精密度好,满足样品测定的定性、定量要求。 相似文献
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建立了高粱中蜀黍苷的高效液相色谱-串联质谱(HPLC-MS/MS)检测方法。样品经甲醇-水(95∶5,v/v)提取,C18色谱柱分离,HPLC-MS/MS多反应离子监测(MRM)方式检测,并采用外标法定量。结果表明,蜀黍苷在浓度10.1~202μg/L范围内时与其峰面积呈良好线性关系,相关系数不低于0.999,检出限为0.178μg/L,定量限为0.593μg/L,低、中、高3个不同水平的加标回收率分别为96.1%、97.9%、90.7%,重复性好,精密度高。所建立的方法具有前处理简单、准确性好、灵敏度高的特点,可用于高粱中蜀黍苷的定量分析。 相似文献