The dicumyl peroxide (DCP), styrene (St), divinyl
benzene (DVB), xylene and acetone, as the initiator, functional monomers and the solvents respectively, were purchased from Chengdu Kelong Chemical Regent Co.
The HPLC system was calibrated for each pigment with commercial standards, namely, chlorophyll a, b provided by Sigma Co; chlorophyll c2, chlorophyll c3, peridinin, 19-butanoyloxyfucoxanthin, fucoxanthin, 19-hexanoyloxyfucoxanthin, diadinoxanthin (DIAD), alloxanthin, lutein, zeaxanthin, divinyl
chlorophyll-a and [beta]-carotene provided by VKI, Denmark.
Even when intravenous alternatives became available, the technique was kept alive by rapid-onset, short-acting anaesthetics such as ethyl chloride, divinyl
ether and cyclopropane.
Gel Permeation Chromatography (GPC): The molecular weight of the polymers was determined by GPC (Varian-Prostar, Model-410) equipped with an auto sampler (100 [micro]L), refractive index (RI) detector, and mixed bed (60 cm) column of poly divinyl
Although this works for many monomers, styrene and divinyl
benzene, alone or with a porogen, are preferred.
D x100mm) containing strong acidic cation exchanger resin (styrene divinyl
benzene copolymer with sulphonic groups).
A gel permeation chromatograph (Model 500, Analytical Scientific Instruments, USA) with a refractive index detector (RI2000, Schambeck, Germany) and two Jordi gel divinyl
benzene mixed bed (Jordi FLP, USA) columns were used to measure the molecular weight relative to the polystyrene standards at 30[degrees]C.
As such, a Restek Q-bond, 100 percent divinyl
benzene porous layer open tubular, 30-m, 0.
Fukuda, "Nitroxide-Controlled Free-Radical Copolymerization of Vinyl and Divinyl
In an alternative embodiment, the polymer comprises vinyl functional polydimethyl siloxane, and preferably high molecular weight methyl divinyl
siloxane, with or without phenyl substituted siloxane.
For backbone, styrene divinyl
benzene (SDB) was preferred over silica gel because it is more rugged, less sensitive to pH changes, and possesses a higher capacity.
occur in the divinyl
(DV) form, namely 8-desethyl, 8-vinyl chlorophyll a (chl [a.