--- title: Precise Viscosity Measurements with Small Samples, 18 µL description: VROC initium the automatic, high throughput viscometer allows viscosity characterization with small samples as little as 18 uL, unattended! --- [![RheoSense company logo - viscometer](https://www.rheosense.com/hs-fs/hubfs/Logo/RegLogo.png?width=258&name=RegLogo.png "RegLogo.png")](https://www.rheosense.com/viscometer?hsLang=en) ![inner-banner-image.png](https://www.rheosense.com/hs-fs/file-874204808-png/images/inner-banner-image.png?width=997&name=inner-banner-image.png "inner-banner-image.png") # **Simply Precise™ Viscosity Measurements with Just 18 µ****L of Sample!** A key application of [VROC® initium](https://www.rheosense.com/products/automatic-viscometer/vroc-initium?hsLang=en) is the hands-free measurement of large numbers of samples with limited sample volume. This allows viscosity characterization of samples that was previously unfeasible due to the large cost associated with samples and manpower required by traditional viscometry methods. The test was conducted as follows: 1. 25 µL samples of BSA (302 mg/mL in water) were loaded into 11 mm vials with 300 µL small-volume inserts (Wheaton) 2. The autosampler loaded 18 µL of the sample into the VROC® initium unit. 3. VROC® initium unit performed a measurement with the loaded sample at a fixed shear rate. 4. VROC® initium performed self-cleaning with preset protocols, and proceeded to the next sample. 8 vials of BSA were tested. The results indicated that the average viscosity of the BSA sample was 5.94 mPa-s at 25 oC, with a relative standard deviation of 0.45%!  Want to read more about automating your viscosity measurements? Visit our application library! ↓  ![Viscosity of 18 uL BSA Tests](https://www.rheosense.com/hs-fs/hubfs/Graphs/Small_Volumes.png?width=599&name=Small_Volumes.png "Viscosity of 18 uL BSA Tests") | Vial # | Chip Temp.,**°C**  | Shear rate, 1/s | Viscosity, mPa-s | | --- | --- | --- | --- | | 1 | 25 | 1065 | 5.984 | | 2 | 25 | 1065 | 5.904 | | 3 | 25 | 1065 | 5.956 | | 4 | 25 | 1065 | 5.93 | | 5 | 25 | 1065 | 5.943 | | 6 | 25 | 1065 | 5.926 | | 7 | 25 | 1065 | 5.958 | | 8 | 25 | 1065 | 5.913 |   [![Download More Application Notes on Automating Your Viscosity Measurements with VROC initium!](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/296746/8d464981-35dd-447d-8182-2980996f00f3.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/296746/8d464981-35dd-447d-8182-2980996f00f3) ## [**Click to Download the PDF!**](https://www.rheosense.com/hubfs/Application_Notes/VROC_initium/Application_Briefs/Application_Brief_-_Small_Volumes.pdf?hsLang=en) [![1412044659_list-128.png](https://www.rheosense.com/hs-fs/hubfs/Icons/1412044659_list-128.png?width=128&height=128&name=1412044659_list-128.png) ](https://www.rheosense.com/hubfs/Application_Notes/VROC_initium/Application_Briefs/Application_Brief_-_Small_Volumes.pdf?hsLang=en) [![Contact Us](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/296746/b070b16f-db8c-4c9c-abe6-46f268ec20ea.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/296746/b070b16f-db8c-4c9c-abe6-46f268ec20ea) [![View Product Preview Page for VROC initium](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/296746/36bc6273-f972-4f5e-bc82-e27810c66e35.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/296746/36bc6273-f972-4f5e-bc82-e27810c66e35) [![Facebook](https://www.rheosense.com/hs-fs/hub/296746/file-2218420815-png/Social_Media_Icons/dfd-1.png?width=40&name=dfd-1.png "Facebook")](http://www.facebook.com/Rheosense) [![Twitter](https://www.rheosense.com/hs-fs/hub/296746/file-2216748016-png/Social_Media_Icons/twitter-1.png?width=40&name=twitter-1.png "Twitter")](https://twitter.com/RheoSense) [![LinkedIn](https://www.rheosense.com/hs-fs/hub/296746/file-2218891837-png/Social_Media_Icons/official_logo_linkedin-1.png?width=40&name=official_logo_linkedin-1.png "LinkedIn")](http://www.linkedin.com/company/rheosense) [![Youtube](https://www.rheosense.com/hs-fs/hub/296746/file-2218891842-png/Social_Media_Icons/Youtube_icon-1.png?width=40&name=Youtube_icon-1.png "Youtube")](http://www.youtube.com/user/rheosense) [![RheoSense Blog](https://www.rheosense.com/hs-fs/hub/296746/file-2218891862-png/Social_Media_Icons/Blog_-_Orange.png?width=40&name=Blog_-_Orange.png "RheoSense Blog")](https://blog.rheosense.com/?hsLang=en) ![](http://nht-2.extreme-dm.com/n2.g?login=rheoextr&url=nojs) [Google+](https://plus.google.com/104262205239525388634)