Anti-HEXA (N-terminal) polyclonal antibody

The title compounds, hexakis[mu(3)-2-(dimethylamino)ethanolato]hexa- 2-isopropanolato- 4-oxido-tetradecalithium(I), [Li7(i-PrO)3(C4HioN0)3120 (1), and {3-[(2-methoxyethyl)(methyl)amino1-1,1-dimethylpropanolatoldiisopropanolsodium(I), [Na(i-PrOH)2(C8H18NO2)] (2), were crystallized in the presence of 2-propanol (i-PrOH, C3H7OH). The structure 1 has monoclinic symmetry (C2Ic) and the asymmetric unit contains half of the compound. Title compound 2 has triclinic symmetry (Pi) and the asymmetric unit is half of an inversion symmetric aggregate. Both compounds consist of an alkali metal, an aminoalkoxide and a 2-propanol compound. Furthermore, the dimeric sodium aggregate 2 is build up by hydrogen bonding through the 2-propanol and the alkoxides. Compound 1 does not exhibit hydrogen bonding, due to the fact that the 2-propanol is deprotonated. In compound 1, benzene appeared as cocrystallate, but was suppressed by solvent masking because of strong disorder. The formula mass and density do not take account of the solvent.

Quinoline yellow (E104) dye is a food additive and generally used in cosmetics and drugs. In this work, polyethylene glycol hexa decyl ether (Brij 58) was used for the spectrophotometric determination of quinoline yellow (QY) in food and drug samples after cloud point extraction (CPE). Some parameters such as extraction temperature and time, pH, centrifuge speed, Brij 58 (surfactant) concentration, and Na2SO4 concentration were optimized using Box-Behnken design. The limit of detection (LOD) of this method was 0.0019 mu g mL(-1) for QY while the relative standard deviation (RSD) at low concentration levels (0.03 mu g mL(-1)) was 132% (n = 5). Findings indicated that, this novel CPE method can be used quickly for the reproducible, selective and sensitive determination of QY dye in ordinary analysis. (C) 2020 Published by Elsevier B.V.