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Recently, the development of molecular sensing systems for transition metal ions has gained intense attraction . Although great success has been made in this field, the majority of fluorescence probes exhibits a fluorescence quenching response upon binding with paramagnetic transition metal ions As fluorescence quenching probes’ response often results in low signal-tonoise ratio it is desirable to detect transition metal ions using an enhanced fluorescence signal. Although many fluorescent probes that display fluorescence amplification for transition metal ions such as Cu2þ [15,16], Zn2þ Fe3 Hg2þ have been reported, fluorescence molecules suitable for use with typical transition metal fluorescence quenchers namely, Ni2þ and Co2þ, are scarce. To circumvent the fluorescence quenching problem, paramagnetic Co2þ ions have to be oxidized to non-fluorescence-quenching diamagnetic Co3þ ions before fluorescence testing [23–25]. Bharadwaj and Qian reported two probes that provided an enhanced fluorescence response toward Ni2þ and Co2þ in the absence of oxidizing agents. However, caution must be exercised in the interpretation of the enhanced fluorescence observed with these probes, as suggested by de Silva et al. [28], as the onset of fluorescence is most likely attributable to the protonation of the amino receptor by the acidic hydration shells of the transition metal salts in moist organic solvents [29]. Newport Green (Molecular Probes Inc.) is a fluorescent indicator for Ni2þ and Co2þ ions [30,31] that is highly expensive as its synthesis is very complex. |
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zcy86520
铁杆木虫 (著名写手)
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木战士(金币+5,VIP+0):谢谢不太准啊 11-24 22:16
木战士(金币+5,VIP+0):谢谢不太准啊 11-24 22:16
| 最近，分子传感过渡金属离子系统的发展取得了强烈的吸引力。虽然已取得巨大成功，在这个领域取得了大多数荧光探针荧光猝灭呈现出淬火探针结合后的反应，往往在低顺磁信号，结果与过渡金属离子荧光- tonoise比例是可取的检测过渡金属离子使用的反应增强的荧光信号。虽然许多显示为过渡金属离子荧光如Cu2þ放大[15,16]，Zn2þ Fe3 Hg2þ据报道，荧光分子与过渡金属典型的荧光猝灭剂，即使用合适的荧光探针Ni2þ和Co2þ，很少。为了规避荧光猝灭问题，顺Co2þ离子被氧化了非荧光猝灭荧光检测抗磁前Co3þ离子[23-25]。巴拉德瓦杰钱两个探头报告中所提供的氧化剂的情况下朝着Ni2þ和Co2þ增强荧光反应。但是，政府必须谨慎在荧光增强行使解释这些探头观察所建议的那样德席尔瓦等。 [28]作为荧光的到来，很可能是由于氨基酸受体的质子由在潮湿的有机溶剂过渡金属盐类[29酸性水合壳]。新港绿色（分子探针公司）是一个Ni2þ和Co2þ离子荧光指示剂[30,31]这是非常昂贵的合成非常复杂。 |
2楼2009-11-24 18:44:01
bohaiwang
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
木战士(金币+130,VIP+0):谢谢，感觉很不错 11-24 22:17
木战士(金币+130,VIP+0):谢谢，感觉很不错 11-24 22:17
| 最近一段时间，过渡金属离子的分子传感系统引起了广泛的关注。虽然在在这一领域已经取得了很大的成功，但是大多数荧光探针与顺磁性过渡金属离子络合的时候却表现出了荧光淬灭响应。作为荧光淬灭探针的响应常表现出低的信噪比，因此人们期望探测过渡金属离子时能使用到增强的信号。虽然许多对过渡金属离子比如：Cu2+, Zn2+, Fe3+，Hg2+表现出荧光放大效应的荧光探针已经被报道，然而专门适用于过渡金属离子Ni2+，Co2+的荧光淬灭分子却鲜有报道。为了避免顺磁性的Co2+在未被测试之前就已经被氧化成非荧光反磁性的Co3+ ，Bharadwaj 和 Qian报道了在没有氧化剂存在下对Ni2+和Co2+ 具有荧光响应的两类探针。然而，De Silva等人却建议用这类探针观察解释说明荧光增强效应时应十分的小心，因为在湿的有机溶剂中过渡金属盐在酸性条件下的水合作用很容易导致在荧光开始的时候氨基受体的质子化。Newport Green (Molecular Probes Inc.)对Ni2+和Co2+来说虽然是一个荧光指示剂，但却由于其合成起来比较复杂导致价格比较昂贵。 |
3楼2009-11-24 18:47:26
bohaiwang
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4楼2009-11-24 18:50:59
5楼2009-11-24 19:48:07
w408912472
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鼓励一下6楼2009-11-24 19:57:36
先译一段
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木战士(金币+4,VIP+0):谢谢 11-24 22:19
木战士(金币+4,VIP+0):谢谢 11-24 22:19
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Recently, the development of molecular sensing systems for transition metal ions has gained intense attraction. Although great success has been made in this field, the majority of fluorescence probes exhibits a fluorescence quenching response upon binding with paramagnetic transition metal ions. As fluorescence quenching probes’ response often results in low signal-to-noise ratio, it is desirable to detect transition metal ions using an enhanced fluorescence signal. 最近,适用于过渡金属离子的分子传感系统开发已经引起了广泛的关注.虽然在这一领域已经取得了很大成就,但是在与顺磁性过渡金属离子相结合时,大多数荧光探针显示出荧光淬灭响应.因为荧光淬灭的探针响应经常导致低的信噪比,所以采用增强荧光信号来探测过渡金属离子是值得期待的的. BTW:楼主最好把原文编辑好再发,直接复制不利于大家阅读,很多符号还得猜去! [ Last edited by onlliu on 2009-11-24 at 20:35 ] |
7楼2009-11-24 20:33:49
接着来!
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Although many fluorescent probes that display fluorescence amplification for transition metal ions such as Cu2þ [15,16], Zn2þ Fe3 Hg2þ have been reported, fluorescence molecules suitable for use with typical transition metal fluorescence quenchers namely, Ni2þ and Co2þ, are scarce. To circumvent the fluorescence quenching problem, paramagnetic Co2þ ions have to be oxidized to non-fluorescence-quenching diamagnetic Co3þ ions before fluorescence testing [23–25]. 虽然许多对诸如Cu2+[15,16], Zn2+, Fe3+，Hg2+过渡金属离子表现出荧光放大效应的荧光探针已经被报道过,但适用于典型过渡金属离子,即Ni2+,Co2+,的荧光淬灭分子却极少报道.为了避免荧光淬灭问题,在荧光测试前,顺磁性的Co2+离子就已经被氧化成非荧光淬灭抗磁性的Co3+离子[23,25]. |
8楼2009-11-24 21:07:03
最后一段!
★ ★ ★ ★ ★
木战士(金币+5,VIP+0):谢谢 11-24 22:19
木战士(金币+5,VIP+0):谢谢 11-24 22:19
|
Bharadwaj and Qian reported two probes that provided an enhanced fluorescence response toward Ni2þ and Co2þ in the absence of oxidizing agents. However, caution must be exercised in the interpretation of the enhanced fluorescence observed with these probes, as suggested by de Silva et al. [28], as the onset of fluorescence is most likely attributable to the protonation of the amino receptor by the acidic hydration shells of the transition metal salts in moist organic solvents [29]. Newport Green (Molecular Probes Inc.) is a fluorescent indicator for Ni2þ and Co2þ ions [30,31] that is highly expensive as its synthesis is very complex. Bharadwaj 和 Qian报道过两种探针,在没有氧化剂时,对Ni2+和Co2+可产生增强荧光响应.然而正如De Silva等人所建议的,在解释说明用这类探针观察的荧光增强效应时应十分谨慎,因为初始荧光很可能是氨基受体质子化的作用,而氨基受体质子化是在湿的有机溶剂中过渡金属盐在酸性条件下的水合作用引起的.对Ni2+和Co2+而言,Newport Green (Molecular Probes Inc.)是一种荧光指示剂,但由于其合成非常复杂,价格也非常昂贵. BTW: be attributable to 是归因于...的意思,不是有助于...的意思. [ Last edited by onlliu on 2009-11-24 at 21:36 ] |
9楼2009-11-24 21:34:48