检测器的种类及选择方法
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简介
种类:紫外检测器(UV) 荧光检测器(FD) 电化学检测器(ECD) 蒸发光散射检测器(ELSD) 示差折光检测器(RID) 质谱检测器(MSD) 氢火焰检测器(FID) 热导检测器(TCD) 氮磷检测器(NPD) 火焰光度检测器(FPD) 其它检测器:质谱仪、付立叶变换红外光谱仪、 AED、SCD、ELCD、PID、HID等
紫外检测器(UV)
The data showed that glucuronidation of the 3- and 40-hydroxyls resulted in band I λmax hypsochromic shifts (or blue shift) of 13-30 and 5-10 nm, respectively. Glucuronidation of the 5-hydroxyl group caused a band II λmax hypsochromic shift of 5-10 nm. In contrast, glucuronidation of the 7-hydroxyl group did not cause any λmax change in band I or II λmax, whereas glucuronidation of the 6hydroxyl group did not cause predictable changes in λmax values. The paper demonstrated for the first time that a rapid and robust analysis method using λmax changes in online UV spectra can be used to pinpoint region-specific glucuronidation of flavones and flavonols with hydroxyl groups at the 40-, 3-, 5-, and/or 7-position(s).
company name
简介
检测器性能评价指标: 响应值(或灵敏度)S : 定义 S= R/ Q 在一定范围内,信号R与进入检测器的量Q呈线性 关系: R=SQ S= R/Q 单位: mV/(mg / cm3) ;(浓度型检测器) mV /(mg / s) ;(质量型检测器) S 表示单位量的物质通过检测器时,产生的响应 信号的大小。S值越大,检测器(也即色谱仪)的灵 敏度也就越高。
company name (1) SAOWAPA CHUMANEE, SOMYOTE SUTTHIVAIYAKIT, AND PAKAWADEE SUTTHIVAIYAKIT. Identification of the Position of Mono-O-glucuronide of Flavones and Flavonols by Analyzing Shift in Online UV Spectrum (λmax) GenFra Baidu bibliotekrated from an Online Diode Array Detector[J]. Agric. Food Chem. 2009, 57, 1752–1759.
company name
紫外检测器(UV)
固定波长检测器:波长一般为254nm,以低压汞灯为光源, 光源单色性好、光强度大、灵敏度高。 可变波长检测器:目前配置最多的检测器。光路系统类似分 光光度计,一般采用氘灯或卤钨灯为光源,光束经单色器分光 后按需要选择组分的最大吸收波长为检测波长,从而提高灵敏 度。 二极管阵列检测器(DAD)是20世纪80年代出现的一种光学多 通道检测器。在晶体硅上紧密排列一系列光电二极管,每一个 二极管相当于一个单色器的出口狭缝,二极管越多分辨率越高, 一般是一个二极管对应接受光谱上一个纳米谱带宽的单色光。 原理:复色光通过样品池被组分选择性吸收后再进入单色器, 照射在二极管阵列装置上,使每个纳米波长的光强度转变为相 应的电信号强度,即获得组分的吸收光谱,从而获得特定组分 的结构信息,有助于未知组分或复杂组分的结构确定。
company name
紫外检测器(UV)
Identification of the Position of Mono-O-glucuronide of Flavones and Flavonols by Analyzing Shift in Online UV Spectrum (λmax) Generated from an Online Diode Array Detector (1)
company name
紫外检测器(UV)
紫外检测器是液相色谱中使用最广泛的检测器,几 乎所有的液相色谱仪都配此类检测器,是一种选择性检 测器。 原理:朗伯—比尔(Lambert—Beer)定律,即当一束 单色光透过样品池时,若流动相不吸收光,则吸光度 (A)与吸光组分的浓度(C)和样品池的光径长度(L)成正 比。 分类:紫外检测器包括固定波长检测器,可变波长 检测器和光电二极管阵列检测器三类。 缺点:只能检测有紫外吸收的物质,流动相的选择 有 一定限制,流动相的截止波长必须小于检测波长。 适用范围:大多数有紫外吸收的化合物。
In this paper,glucuronide(s) of 36 flavones and flavonols were generated using an in vitro glucuronidation reaction. UPLC/MS/MS was used to confirm the degree (mono- or di-) of glucuronidation in flavonoids with up to four hydroxyl groups. UV spectra of flavonoids and their respective mono-O-glucuronides were generated using UPLC with an online diode array detector. Analysis of the extent of shift in spectra of glucuronides in band I (300-385 nm) and band II (240-280 nm) regions as reflected by changes in λmax value was used to identify the position of glucuronidation.
种类:紫外检测器(UV) 荧光检测器(FD) 电化学检测器(ECD) 蒸发光散射检测器(ELSD) 示差折光检测器(RID) 质谱检测器(MSD) 氢火焰检测器(FID) 热导检测器(TCD) 氮磷检测器(NPD) 火焰光度检测器(FPD) 其它检测器:质谱仪、付立叶变换红外光谱仪、 AED、SCD、ELCD、PID、HID等
紫外检测器(UV)
The data showed that glucuronidation of the 3- and 40-hydroxyls resulted in band I λmax hypsochromic shifts (or blue shift) of 13-30 and 5-10 nm, respectively. Glucuronidation of the 5-hydroxyl group caused a band II λmax hypsochromic shift of 5-10 nm. In contrast, glucuronidation of the 7-hydroxyl group did not cause any λmax change in band I or II λmax, whereas glucuronidation of the 6hydroxyl group did not cause predictable changes in λmax values. The paper demonstrated for the first time that a rapid and robust analysis method using λmax changes in online UV spectra can be used to pinpoint region-specific glucuronidation of flavones and flavonols with hydroxyl groups at the 40-, 3-, 5-, and/or 7-position(s).
company name
简介
检测器性能评价指标: 响应值(或灵敏度)S : 定义 S= R/ Q 在一定范围内,信号R与进入检测器的量Q呈线性 关系: R=SQ S= R/Q 单位: mV/(mg / cm3) ;(浓度型检测器) mV /(mg / s) ;(质量型检测器) S 表示单位量的物质通过检测器时,产生的响应 信号的大小。S值越大,检测器(也即色谱仪)的灵 敏度也就越高。
company name (1) SAOWAPA CHUMANEE, SOMYOTE SUTTHIVAIYAKIT, AND PAKAWADEE SUTTHIVAIYAKIT. Identification of the Position of Mono-O-glucuronide of Flavones and Flavonols by Analyzing Shift in Online UV Spectrum (λmax) GenFra Baidu bibliotekrated from an Online Diode Array Detector[J]. Agric. Food Chem. 2009, 57, 1752–1759.
company name
紫外检测器(UV)
固定波长检测器:波长一般为254nm,以低压汞灯为光源, 光源单色性好、光强度大、灵敏度高。 可变波长检测器:目前配置最多的检测器。光路系统类似分 光光度计,一般采用氘灯或卤钨灯为光源,光束经单色器分光 后按需要选择组分的最大吸收波长为检测波长,从而提高灵敏 度。 二极管阵列检测器(DAD)是20世纪80年代出现的一种光学多 通道检测器。在晶体硅上紧密排列一系列光电二极管,每一个 二极管相当于一个单色器的出口狭缝,二极管越多分辨率越高, 一般是一个二极管对应接受光谱上一个纳米谱带宽的单色光。 原理:复色光通过样品池被组分选择性吸收后再进入单色器, 照射在二极管阵列装置上,使每个纳米波长的光强度转变为相 应的电信号强度,即获得组分的吸收光谱,从而获得特定组分 的结构信息,有助于未知组分或复杂组分的结构确定。
company name
紫外检测器(UV)
Identification of the Position of Mono-O-glucuronide of Flavones and Flavonols by Analyzing Shift in Online UV Spectrum (λmax) Generated from an Online Diode Array Detector (1)
company name
紫外检测器(UV)
紫外检测器是液相色谱中使用最广泛的检测器,几 乎所有的液相色谱仪都配此类检测器,是一种选择性检 测器。 原理:朗伯—比尔(Lambert—Beer)定律,即当一束 单色光透过样品池时,若流动相不吸收光,则吸光度 (A)与吸光组分的浓度(C)和样品池的光径长度(L)成正 比。 分类:紫外检测器包括固定波长检测器,可变波长 检测器和光电二极管阵列检测器三类。 缺点:只能检测有紫外吸收的物质,流动相的选择 有 一定限制,流动相的截止波长必须小于检测波长。 适用范围:大多数有紫外吸收的化合物。
In this paper,glucuronide(s) of 36 flavones and flavonols were generated using an in vitro glucuronidation reaction. UPLC/MS/MS was used to confirm the degree (mono- or di-) of glucuronidation in flavonoids with up to four hydroxyl groups. UV spectra of flavonoids and their respective mono-O-glucuronides were generated using UPLC with an online diode array detector. Analysis of the extent of shift in spectra of glucuronides in band I (300-385 nm) and band II (240-280 nm) regions as reflected by changes in λmax value was used to identify the position of glucuronidation.