Varian Inc

Figure 4.20 Size-exclusion chromatogram of SBR adhesive formulation in THF using UV and RI detectors. After Alfredson and Tschida [760]. Reproduced by permission of Varian, Inc.

Varian Chrompack Application Note 19-GC, Varian Inc., Walnut Creek, CA (n.d.). 

FIGURE 1.25 Principle of operation of solid-supported liquid-liquid extraction from aqueous or plasma samples. (Reproduced with permission from Varian, Inc.)... 

Figure 7 The sinker required in the Japanese Pharmacopeia. (Courtesy of VanKel, a member of the Varian, Inc. Life Science Business, Cary, North Carolina, U.S.A.)...

Figure 7.1 SEC chromatogram and calibration curve. (Adapted from E.L. Johnson and R.L. Stevenson, Exclusion chromatography, in Basic Liquid Chromatography, Varian, 1978. With permission of Varian, Inc.)...

Separation of five compounds (DL, 6-OH-DL, 3-OH-DL, 7V-OH-DL, and 1-pyridine-/V-oxide-DL) was achieved using an Alliance HPLC system (Waters Corp., Milford, CA) equipped with a 2690 model pump, an autoinjector, a Polaris Cl8-A guard column (Varian Inc., Lake Forest, CA), and a Luna Phenyl-Hexyl analytical column (Phenomenex, Inc., Torrance, CA) maintained at 40°C. For robust characterization of each isomeric compound, an online HDX LC-MS method was developed. The composition of regular and deuterated mobile phases is summarized below ... 

Affinity chromatography. Disposable empty columns, e.g., Bond Elut TCA (4-mL propylene columns with 20-pm frits) from Varian, Inc., can be used. Alternatively, if choosing an automatic system of sample/buffer loading and sample collection, e.g., the FPLC system from Amersham Biosciences, the affinity resins must be properly packed in columns recommended by the supplier. 

In the fiber mode, the sorbent coated fiber is housed in a microsyringelike protective holder. With the fiber retracted inside the syringe needle, the needle is used to pierce the septum of the sample vial. The plunger is depressed to expose the sorbent-coated fiber to the sample. After equilibrium is reached or at a specified time prior to reaching equilibrium, the fiber is retracted into the protection of the microsyringe needle and the needle is withdrawn from the sample. The sorbent is then interfaced with an analytical instrument where the analyte is desorbed thermally for GC or by solvents for HPLC or capillary electrophoresis. For the in-tube mode, a sample aliquot is repeatedly aspirated and dispensed into an internally coated capillary. An organic solvent desorbs the analyte and sweeps it into the injector [68,130,133]. An SPME autosampler has been introduced by Varian, Inc., that automates the entire process for GC analyses. 

Figure 9.2 Spectra obtained using the Varian 5 mm XSens dual cold probe. (A) 500 MHz H spectrum, 50 pg quinine, 3 mm NMR tube, 1 scan acquisition. (B) 125 MHz 13C spectrum, 50 pg quinine, 3 mm NMR tube, 2.5 hour acquisition (data kindly provided by Varian Inc.).

The Flow Control Device for the LC/NMR System Courtesy of Varian Inc. 

Figure 15.2 Oscilloscope trace showing the first NMR spectrum of ethanol, taken at Stanforil University in I951. (Courtesy of Varian, Inc.)...

Figure 2-1 Effects of misadjusted shim settings, (a) Z3 misset. (b) Z5 misadjusted. (c) Z2 misset. (d) Z4 misadjusted. (e) First-order spinning sidebands X, Y, XZ, and YZ misset. (f) Second-order spinning sidebands XY and X2-Y2 misadjusted on lop of first-order sidebands, (g) High-order nonspin shims X3, Y3, Z3X, and Z3Y misset. (h) Zl, Z2, and Z4 misadjusted. These spectral effects have been exaggerated for the purpose of illustration. (Courtesy of Varian Inc. Technical Publications.)...

The Handbook of Sorbent Extraction Technology, 2nd ed., Varian Inc., Palo Alto, CA 1993. 

A study of column extraction of metals was carried out using pre-packed columns available from Polymer Laboratories (now a part of Varian, Inc.) [6]. Trace metals in these monomers would have a detrimental effect on the stability of anaerobic adhesive products and must be absent prior to use. The columns used are specially coated macroporous polystyrene products that are compatible with polar, non-polar, protic and aprotic solvents. They are designed to remove metals from solvents and monomers. The metal removing SPE product is approximately 45 pm and based on a mono-dispersed macroporous polymeric material. 

Stratospheres SPE Resins, mini high load scavenger resin columns , Polymer Laboratories (now a part of Varian Inc.). 

---