Agilent 1100 HPLC system

The Agilent 1100 Series HPLC system is a classic, fully modular high-performance liquid chromatography platform renowned for its rugged mechanical design, long-term reliability, and broad compliance with pharmacopoeial (USP, EP, JP) and GLP/GMP requirements, making it the workhorse of pharmaceutical QC, contract research, food safety, and environmental testing laboratories worldwide. This typical configuration comprises a G1322A (or G1379A) four-channel online vacuum degasser, a G1312A binary pump, a G1313A (or G1329A) autosampler (ALS), a G1316A thermostatted column compartment, and a G1315B diode array detector (DAD), all controlled via PC running Agilent ChemStation or OpenLAB CDS software. The G1322A degasser uses permeable Teflon AF tubing under controlled vacuum to strip dissolved gases from up to four mobile phase lines at flow rates up to 10 mL/min per channel, eliminating bubble-induced baseline noise and gradient artifacts without requiring helium sparging. The G1312A binary pump employs a dual-piston-in-series, servo-controlled floating design with active inlet valves and high-pressure (post-compression) blending of channels A and B, delivering pulse-free flow from 0.001 to 5.000 mL/min with ≤0.07% RSD precision and a typical operating pressure of 0–400 bar (5,880 psi); compressibility compensation is user-selectable for aqueous or organic-dominated phases, and early maintenance feedback (EMF) tracks seal wear. The G1313A ALS draws samples via a metal-free metering pump into a fixed or variable-volume loop, supporting injection volumes from 0.1 to 100 µL (extendable by multiple draws), with injection precision typically <0.5% RSD and carryover <0.05% after programmable needle wash; it accepts a standard tray of 100 × 2 mL vials or microplates, and can be paired with a G1330B thermostat for sample tray cooling/heating (4–40 °C). The G1316A column compartment uses Peltier elements to maintain column temperature from 10 °C below ambient up to 80 °C (optionally 100 °C) within ±0.15 °C, accommodating two analytical columns with low-dispersion plumbing and supporting pre- and post-column switching. The G1315B DAD illuminates the flow cell simultaneously with deuterium (UV) and tungsten (VIS) lamps, capturing 190–950 nm spectra via a 1024-element photodiode array at 1 nm optical resolution; a programmable slit (1–16 nm) optimizes light throughput vs. spectral resolution, short-term noise is typically ±1 × 10⁻⁵ AU at 254 nm, and the detector stores 3D chromatogram–spectral data for peak purity analysis, coelution detection, and spectral library matching—features unattainable with a single-wavelength VWD. The entire stack communicates over Agilent CAN bus and is operated through the workstation, which provides gradient editor, multi-level calibration, audit trail, and 21 CFR Part 11 readiness. Though superseded by the Infinity II/III lines, the Agilent 1100 remains prized for its straightforward maintenance, abundant spare parts ecosystem, and proven performance with 3–5 µm analytical columns in validated methods that demand consistency over decades.