Topic
Endcapping
About: Endcapping is a research topic. Over the lifetime, 246 publications have been published within this topic receiving 4990 citations.
Papers published on a yearly basis
Papers
TL;DR: In this paper, a triacontyl polymeric surface modification of a moderate pore size (approximately 20 nm), moderate surface area (approximately 200 m2/g) silica, without subsequent endcapping, was demonstrated for the separation of structurally similar carotenoid standards, an extract of a food matrix Standard Reference Material, and a beta-carotene dietary supplement under consideration as an agent for cancer intervention/prevention.
Abstract: A variety of bonded phase parameters (endcapping, phase chemistry, ligand length, and substrate parameters) were studied for their effect on column retention and selectivity toward carotenoids. Decisions were made on how each of these variables should be optimized based on the separation of carotenoid and polycyclic aromatic hydrocarbon test probes. A column was designed with the following properties: high absolute retention, enhanced shape recognition of structured solutes, and moderate silanol activity. These qualities were achieved by triacontyl (C30) polymeric surface modification of a moderate pore size (approximately 20 nm), moderate surface area (approximately 200 m2/g) silica, without subsequent endcapping. The effectiveness of this "carotenoid phase" was demonstrated for the separation of a mixture of structurally similar carotenoid standards, an extract of a food matrix Standard Reference Material, and a beta-carotene dietary supplement under consideration as an agent for cancer intervention/prevention.
369 citations
TL;DR: It is found that endcapping alkyl-bonded stationary phases increases column longevity at pH 7, compared to non-endcapped columns, and that the type of silica support determines the stability of bonded-phase packings.
171 citations
Patent•
18 Jan 1999
TL;DR: In this paper, a polyol component having terminal unsaturation of less than 0.2 meq/g with a diisocyanate component was used to form a hydroxyl-terminated prepolymer, and endcapped the prepolymers with an isocyanates silane of the formula OCN--R--Si--(X) m (--OR 1 ) 3-m wherein m is 0, 1 or 2, each R 1 is alkyl containing 1 to 4 carbon atoms, each X is a difunctional organic
Abstract: Silylated polyurethanes exhibiting a superior combination of mechanical properties and which cure in reasonable time to a low-tack sealant, without excessive viscosity, are prepared by reacting a polyol component having terminal unsaturation of less than 0.2 meq/g with a diisocyanate component to form a hydroxyl-terminated prepolymer, and endcapping the prepolymer with an isocyanate silane of the formula OCN--R--Si--(X) m (--OR 1 ) 3-m wherein m is 0, 1 or 2, each R 1 is alkyl containing 1 to 4 carbon atoms, each X is alkyl containing 1 to 4 carbon atoms, and R is a difunctional organic group.
152 citations
TL;DR: This application demonstrates the applicability of LC-MS for analysis of polar OPs in surface, ground and drinking water, as a more favourable alternative to GC.
124 citations
TL;DR: In this paper, a series of positively charged polyethylene oxide (PEO)-400 hybrid membranes were obtained by endcapping PEO-400 with Tolylene 2,4-diisocyanate (TDI), followed by a reaction with N-[3-(trimethoxysilyl) propyl] ethylene diamine (A-1120).
106 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 5 |
| 2018 | 2 |
| 2017 | 6 |
| 2016 | 7 |
| 2015 | 3 |