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      A quimiluminescência como ferramenta analítica: do mecanismo a aplicações da reação do luminol em métodos cinéticos de análise Translated title: Chemiluminescence as an analytical tool: from the mechanism to applications of the reaction of luminol in kinetic based methods

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          Translated abstract

          Relevant aspects of proposed mechanisms of the chemiluminescent reaction of luminol are presented and commented to emphasize its perspectives for kinetic analysis. A careful search for analytical applications of this reaction is discussed in order to point out new trends of the studies. Kinetic analysis using the luminol reaction is proposed to be a very attractive due to the good performance of the reaction in analytical applications and the positive characteristics of kinetic analysis, such as low cost and sensibility. It is pointed out that kinetic analysis using the chemiluminescent reaction of luminol should be encouraged.

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          A spin-adapted Density Matrix Renormalization Group algorithm for quantum chemistry

          We extend the spin-adapted density matrix renormalization group (DMRG) algorithm of McCulloch and Gulacsi [Europhys. Lett.57, 852 (2002)] to quantum chemical Hamiltonians. This involves two key modifications to the non-spin-adapted DMRG algorithm: the use of a quasi-density matrix to ensure that the renormalised DMRG states are eigenvalues of \(S^2\) , and the use of the Wigner-Eckart theorem to greatly reduce the overall storage and computational cost. We argue that the advantages of the spin-adapted DMRG algorithm are greatest for low spin states. Consequently, we also implement the singlet-embedding strategy of Nishino et al [Phys. Rev. E61, 3199 (2000)] which allows us to target high spin states as a component of a mixed system which is overall held in a singlet state. We evaluate our algorithm on benchmark calculations on the Fe\(_2\)S\(_2\) and Cr\(_2\) transition metal systems. By calculating the full spin ladder of Fe\(_2\)S\(_2\) , we show that the spin-adapted DMRG algorithm can target very closely spaced spin states. In addition, our calculations of Cr\(_2\) demonstrate that the spin-adapted algorithm requires only roughly half the number of renormalised DMRG states as the non-spin-adapted algorithm to obtain the same accuracy in the energy, thus yielding up to an order of magnitude increase in computational efficiency.
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            Chiral Brønsted acid-catalyzed inverse electron-demand aza Diels-Alder reaction.

            Inverse electron-demand aza Diels-Alder reaction of aldimine with enol ethers proceeded under the influence of a phosphoric acid diester, derived from (R)-BINOL, to give tetrahydroquinoline derivatives with excellent enantioselectivity.
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              Glycosylation profiling of a therapeutic recombinant monoclonal antibody with two N-linked glycosylation sites using liquid chromatography coupled to a hybrid quadrupole time-of-flight mass spectrometer.

              Monoclonal antibodies have been used increasingly as therapeutic agents to target various diseases. Although most monoclonal antibodies have only one N-linked glycosylation site in the Fc region, N-linked glycosylation sites in the Fab region have also been observed. Because glycosylation of a monoclonal antibody can have a significant impact on its effector function, efficacy, clearance, and immunogenicity, it is essential to assess the glycosylation profile during cell line and clone selection studies and to assess the impact of cell culture conditions on the glycoform distribution during process optimization studies to ensure that the antibody is being produced with appropriate and consistent glycosylation. This article describes a liquid chromatography-mass spectrometry-based approach, in combination with papain digestion and partial reduction, to obtain site-specific glycosylation profile information for a therapeutic monoclonal antibody with two N-linked glycosylation sites in the heavy chain.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                qn
                Química Nova
                Quím. Nova
                Sociedade Brasileira de Química (São Paulo )
                1678-7064
                November 2002
                : 25
                : 6a
                : 1003-1011
                Affiliations
                [1 ] Universidade Estadual de Campinas Brazil
                Article
                S0100-40422002000600018
                10.1590/S0100-40422002000600018
                5688439a-9593-483f-b480-194bc004d6b5

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-4042&lng=en
                Categories
                CHEMISTRY, MULTIDISCIPLINARY

                General chemistry
                luminol,chemiluminescence,kinetic analysis
                General chemistry
                luminol, chemiluminescence, kinetic analysis

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