View Table of Contents Gusmer Analytical Services Frequently Asked Questions
Which analysis method do I choose? When you require highly accurate and precise results, direct analysis methods are the better choice. These methods are accepted by the TTB and held to a rigorous standard of quality. FTIR (Fourier Transform Infrared) technology offers fast, reliable, repeatable, and cost-effective results, making it an excellent tool for identifying trends and managing large sample batches efficiently. These panels provide exceptional value, delivering significant advantages for your investment. What filter grade is optimal for my filtration? The Filterability test helps to determine the optimal Gusmer
Why is sulfide detection important? Wine can have off-aromas related to sulfides, causing a rotten egg, skunky, or cabbage smell. The sulfide compounds include hydrogen sulfide, mercaptans, and higher molecular weight disulfides. Lower molecular weight compounds are often treated effectively with copper alone, while the higher molecular weight compounds require initial treatment with ascorbic acid. Our Sulfide Detection and Treatment panel utilizes different levels of ascorbic acid and copper sulfate, followed by sensory trials to identify and address sulfide issues. How to Submit and Ship Samples Grape and Juice Samples Grape clusters can be refrigerated and shipped with a cooler pack. Juice and fermenting samples should be shipped in a plastic bottle filled one-quarter full, placed in several sealed plastic bags, and accompanied by a cold pack. Samples can also be submitted in person. All Other Samples To ensure accurate analysis, please send full (topped) containers of your beverage along with a completed Analysis Request Form. Be aware that some analyses require unopened cans or bottles, or specific volumes, which will be noted in the analysis description. You can send samples via UPS, FedEx, or deliver them in person. Please note that the US Postal Service does not accept or ship alcoholic products. If you have any questions about sample submission please call the lab at 707.224.7903 ext. 306. The minimum analysis charge is $25. Samples can be submitted in person or mailed to: Gusmer Analytical Services 640-D Airpark, Road, Napa, CA 94558 Analytical Request Form To download the analysis request form from Gusmer’s website, please scan this QR code.
filter media grade to achieve your filtration goals. To conduct the test, we will need your current filter
specifications (size and filter sheet capacity for plate and frame filters, or the number and size for lenticular filters), operating batch size, and the volume of wine to be filtered. The report can include: • A recommendation of which Gusmer filter media grade to choose • A estimate of how many gallons of wine will be filtered before exhausting or plugging the filters • A recommendation of whether a multi-step filtration is required Our technicians will assist you to achieve your filtration goals and maximize total throughput. Will my wine prematurely clog my sterile membrane? The Membrane Clogging Index test provides a clogging index number that indicates whether the wine is ready for sterile filtration. This test requires 500 mL of wine and should be conducted no more than five days before sterile filtration or bottling. A passing result is anything below 25 - this wine will generally be easy to filter through final cartridge filter membranes. A failing result is anything above 25 - this wine requires additional depth filtration prior to sterile filtration to prevent clogging and maximize the throughput and life of the final cartridge filter membrane.
For pricing or questions regarding samples for analysis or sampling procedures, please call our Napa Laboratory at 707.224.7903, extension 306.
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