Rapid determination of 1,3-propanediol in fermentation process based on a novel surface-enhanced Raman scattering biosensor

Progress in Production of 1, 3-propanediol From Selective Hydrogenolysis of Glycerol

1,3-propanediol (1,3-PDO) is an important bulk chemical widely used in the polyester and polyurethane industry. The selective hydrogenolysis of glycerol to value-added 1,3-PDO is extremely attractive. However, the formation of 1,3-PDO is less thermodynamically stable than 1,2-PDO, and the steric hindrance effect in the reaction process makes the highly selective production of 1,3-PDO a great challenge. In this mini review, the recent research progress on the selective catalytic hydrogenolysis of glycerol to 1,3-PDO is overviewed and the catalytic mechanism of the reaction is summarized. We mainly focus on the different performances of each type of catalyst (Pt-W-based catalysts, Ir-Re based-catalysts, and other types) as well as the interactions between metals and supports. Finally, several personal perspectives on the opportunities and challenges within this promising field are discussed.

Facile synthesis of Au nanoparticle-coated Fe3O4 magnetic composite nanospheres and their application in SERS detection of malachite green

A facile method for synthesizing Au nanoparticle-coated Fe₃O₄ magnetic composite nanospheres (Fe₃O₄@Au MCS) via seed-mediated growth and iterative reduction is reported. The nanospheres were then successfully used to detect malachite green (MG) residues in water bodies via surface-enhanced Raman scattering (SERS) technique. Fe₃O₄@Au MCS has excellent optical properties and superparamagnetism; it can be dispersed into the solution to fully adsorb target molecules and then collected with a magnet to increase the molecular density and the number of SERS hot spots. Magnetic enrichment was superior to conventional detection method. The limit of detection for MG was 10^-7 M and the enhancement factor was 1.1 × 10⁵. The logarithm of the SERS intensity of the characteristic peak at 1618 cm^-1 exhibited a linear relationship with the logarithm of the MG concentration over the range of 10^-3- 10^-7 M, with a correlation coefficient of 0.966. The Fe₃O₄@Au MCS had good uniformity of SERS signals, with a 18.59% relative standard deviation for the SERS intensity. MG detection in aquaculture water conformed with the established quantitative regulations. The SERS spectrum calculated with density function theory for MG adsorbed on Fe₃O₄@Au MCS was very close to the experimental spectrum, which verified enhancement by the substrate. Overall, Fe₃O₄@Au MCS enabled ultrasensitive, quantitative SERS detection of MG.