Peak Tales

Peak Tales is Agilent's podcast about chromatography, built as a run of question-and-answer sessions between host John and a guest. John asks the kind of question an analyst would bring to the bench. The guest answers in full and follows the choice through to what it does to the separation. That pattern holds whether the subject is gas chromatography or HPLC. Take the GC inlet liner. In 'Peak Tales EP 50 Inlet Liner Selection', Darren Decker, an applications engineer with Agilent, explains that the glass wool inside a liner is there for thermal mass, not to filter out debris, even though it does trap some and spare the gold seal. Asked whether the wool belongs at the top, middle or bottom, his usual answer is 'yes', meaning the position matters less than making sure it stays put. The real lesson is consistency: liners get dirty, and a replacement with a different wool size, placement or density can quietly change results. Darren also appears in an episode on DBWAX UI columns, where the talk turns to a test mix stocked with difficult analytes such as decanol, ethyl hexanoic acid and ethyl maltol. Ethyl hexanoic acid, the conversation notes, almost always tails a little, and the claim is that on this column the tailing is minimal. For liquid chromatography, Rita covers updating HPLC methods across two episodes, 'Updating Isocratic HPLC methods' and 'Peak Tales EP 49 Updating Gradient Methods'. The isocratic discussion is full of tradeoffs. A smaller particle size lifts efficiency and improves resolution, though resolution does not rise in proportion, and pressure climbs, so the instrument has to be able to handle it. Cut a column from 150 to 75 millimetres and the analysis time changes in proportion. The gradient episode adds more conditions: keep the gradient steepness the same across columns, scale the injection volume down with the column volume, and account for the extra-column volume in the flow path, which is why the instrument itself matters. Some episodes are replays. A Best Of Series episode replays a season-one conversation with Paul Altiero, whom John calls Professor Paul, on benchmarking a new HPLC column: inject control samples or an internal standard, then track area, resolution or tailing factor on statistical quality control charts. Another recast replays a conversation with Tim Kiefover, director of Agilent's educational programs, about formalized training, its link to retention and employee satisfaction, classroom courses that pair a lecture with a lab, and an option for self-paced learners. The vendor connection is plain in every episode here, each closing by directing listeners to a local Agilent representative, and several end with a promotion code on chemistries and supplies. HPLC users could start with the isocratic and gradient episodes as a pair, and GC users will likely get the most immediate use from the liner discussion.