Detection and selective sample clean-up of beryllium(ii) through {extractor-HOMO}(:){Be₃O(OH)₂}²⁺ ‘ion pair complexation’ amidst aluminum(iii) and uranium(vi) by employing a fluorescent resin: the resin's HOMO amount is a quantitative descriptor of BTC

Abstract

Under optimum sorption conditions, FSG–PAN forms 1 : 1 ‘ion pairs’ with {Be3O(OH)2}2+, {Al3(OH)3(H2O)2}6+ and {(UO2)2(OH)2(H2O)7}2+.

Multipoint Immobilization at the Inert Center of Urease on Homofunctional Diazo-Activated Silica Gel: A Way of Restoring Room-Temperature Catalytic Sustainability for Perennial Utilization

“…A distinguishing high-intensity peak at 1035.7 cm –1 for Si–O–Si of the SG network core identifies the inert support . The low-intensity peak at 1421 cm –1 for the −NN– stretching vibration is the full-proof descriptor of the diazo linkage. ,, In the present methodology, the diazo linkage appears at the o rtho position for the phenolic −OH of a tyrosine residue …”

“…74 The low-intensity peak at 1421 cm −1 for the −NN− stretching vibration is the fullproof descriptor of the diazo linkage. 58,75,76 In the present methodology, the diazo linkage appears at the ortho position for the phenolic −OH of a tyrosine residue. 58 The solid-phase UV−visible spectrum of pure tryptophan in SG shows a high-intensity peak shoulder at 286 nm (Figure 3a).…”

Improvement of Adsorption Selectivity of Ion-Exchange Chromatography through the Double-Recognition Mode

“…The results of the methylene blue method showed that the adsorption area of resins were 10.01 m 2 /g for DEAE Bestarose FF, 9.42 m 2 /g for DEAE@BSA, 8.87 m 2 /g for DEAE@bIgG, and 9.79 m 2 /g for DEAE@NIP. Then, more methods were adopted to characterize the composition and structure of resins. − FTIR spectroscopy was performed and the results are illustrated in Figure , with DEAE Bestarose FF and DEAE@NIP as controls. As shown in Figure , after the template proteins BSA and bIgG were washed away, DEAE@bIgG, DEAE@BSA, and DEAE@NIP showed similar FTIR spectra.…”

Chemically Bonded Pepsin via Its Inert Center to Diazo Functionalized Silica Gel through Multipoint Attachment Mode: A Way of Restoring Biocatalytic Sustainability over “Wider pH” Range

“…The strongly intense peak 1094 ± 45 cm –1 is assigned for Si–O–Si stretching SG unit cell . The bands around 803 ± 5 cm –1 and 468 ± 10 cm –1 resulted from Si–O vibrations . Three new peaks, 2970 cm –1 (C–H peak from DMDCS), 1516 cm –1 (the CC aromatic stretching vibration), 1342 cm –1 (C–N stretching vibration of the nitro groups) appeared on the nitro-derivative of SG .…”