Butyl-octyl

The original acid—clay developers have been largely replaced by phenohc compounds, such as para-substituted phenohc novolaks. The alkyl group on the phenohc ring is typically butyl, octyl, nonyl, or phenyl. The acidity is higher than that of a typical unsubstituted novolak because of the high concentration of 2,2 -methylene bridges. 

HEPTANE 571 C12H26S BUTYL-OCTYL- -241.769 1.0327E-H30 1.6697E-04 81.17... 

Summer KH, Kiein D, Griem H (2003) Ecological and toxicological aspects of mono- and disubstituted methyl-, butyl-, octyl-and dodecyltin compounds— Update 2002. GSF Nationai Research Center for Environment and Heaith, Neuherberg, for the Organotin Environmentai Programme (ORTEP) Association, December. 

Reverse-phase HPLC (RP-HPLC) separates proteins on the basis of differences in their surface hydophobicity. The stationary phase in the HPLC column normally consists of silica or a polymeric support to which hydrophobic arms (usually alkyl chains, such as butyl, octyl or octadecyl groups) have been attached. Reverse-phase systems have proven themselves to be a particularly powerful analytical technique, capable of separating very similar molecules displaying only minor differences in hydrophobicity. In some instances a single amino acid substitution or the removal of a single amino acid from the end of a polypeptide chain can be detected by RP-HPLC. In most instances, modifications such as deamidation will also cause peak shifts. Such systems, therefore, may be used to detect impurities, be they related or unrelated to the protein product. RP-HPLC finds extensive application in, for example, the analysis of insulin preparations. Modified forms, or insulin polymers, are easily distinguishable from native insulin on reverse-phase columns. 

C12H26S BUTYL-OCTYL-SULFIDE 5.809E-04 733.68 -0.7143 259.16 697.00 8.431E-04 0.842... 

Reverse-phase HPLC (RP-HPLC) separates proteins on the basis of differences in their surface hydrophobicity. The stationary phase in the HPLC column normally consists of silica or a polymeric support to which hydrophobic arms (usually alkyl chains such as butyl, octyl or... 

Octahydro-9 H- (heptafluoro-l-hydro-lH-butyl)- octyl)- ElOa, 51 (Toxicity)... 

To give the semipermeable membrane flexibility, plasticizers such as phthalates (dibenzyl, dihexyl, or butyl octyl), triacetin, epoxidized tal-late, or tri-isoctyl trimellitate are added.18 In the design of osmotic controlled release systems, these plasticizers help to modulate and achieve the required release rate. 

TPP-extracted GFPuv from pelleted cells of E. coli was eluted through four HiTrap FF HIC columns methyl, butyl, octyl, phenyl Sepharose. The fluorescence intensity (excitation/emission maxima at 394/509 nm) of eluted samples was related to pg of GFPuv/mL, and then the same samples were run on a 12% SDS-PAGE gel (Figs. 1 and 2). 

Meanwhile, lower monohydric alcohols were first made by the oxo process. These included n-propanol, n- and isobutanol and amyl alcohol. In PVC, only one of these assumed any importance -n-butanol - mainly in butyl benzyl phthalate. Dibutyl phthalate (DBP) was by this time considered too volatile for use in PVC in the U.S.(10). The so-called coesters - butyl octyl phthalate (BOP), butyl isodecyl phthalate and butyl cyclohexyl phthalate -have been on and off the market for many years but never achieved major success in the U.S. Dibutyl phthalate/DOP blends and BOP have probably been most successful in Japan. Diisobutyl phthalate is used in Brazil and other South American countries even today, because of its low cost. BOP is also offered in Europe, but as in the U.S., it has not been a major success. One reason could be the wide variability of composition from different suppliers. In fact, some BOP s were merely physical blends of DBP and DOP. 

Anwander and coworkers100 101 silylated the inner surfaces of MCM-41 samples and phases built by co-condensation of TEOS and BTEE with disilazanes of the type HN(SiRR2)2 (R, R = H, Me, Ph, vinyl, n-butyl, / -octyl), whereby the degree of sily-lation depended naturally on the spatial requirements of the silylating reagent. Complete passivation could be achieved with hexamethyldisilazane, which can be used to determine the number of free silanol groups. The vinyl-functionalized MCM-41 samples proved to be very amenable to subsequent surface modification by hydroboration. 

Solid-phase matrices used for hydrophobic interaction chromatography are composed of hydrophilic structures such as agarose, dextran, and hydrophilic polymers. Hydrophobic sites such as methyl, butyl, octyl, dodecyl, and phenyl groups are chemically attached by means of activation reactions. 

In this paper solubility measurements of synthetic and natural dyestuffs are presented using VIS-spectroscopy. The investigations concentrate on two different methods. I. P-carotene was measured as a function of temperature and pressure in near- and supercritical C02 (289 to 309 K, 10 to 160 MPa) and CC1F3 (297 to 326 K, 12 to 180 MPa), respectively, using a static method. II. Additionally, the solubilities of l,4-bis-(n-alkylamino)-9,10-anthraquinones (with n-alkyl = butyl, octyl) were determined with a dynamic method in temperature and pressure ranges from 310 to 340 K and 8 to 20 MPa, respectively this method permits a continuous purification from better soluble impurities as well as the measurement of solubilities at the same time. For both anthraquinone dyestuffs intersection points of the solubility isotherms were found in the plot of concentration versus pressure. This behavior can be explained by a density effect. 

The dynamic method permits the purification from better soluble impurities as well as continuous solubility measurements at the same time. An adsorption effect of the stationary phase which is used to precipitate the dyestuff on its surface is not found within the experimental accuracy. The measurements of l,4-bis-(n-alkylamino)-9,10-anthraquinone (with n-alkyl = butyl, octyl) show two intersection points in the plot of pressure versus concentration. 

C11H12 p-isopropylenylstyrene 16262-48-9 1.213E-h10 94.350 25316 C12H26S butyl octyl sulfide 16900-07-5 1.904E-I-10 140.440... 

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