Compound Specific 13C & 15N analysis of Amino Acids by GC-C-IRMS

The Stable Isotope Facility (SIF) will be closing, effective July 26, 2026.

June 3, 2026
An Update on the Plant Sciences Stable Isotope Facility

Dear Faculty, Staff, Students, and Supporters,
After a lengthy review process and careful consideration, we have made the difficult decision to sunset the Stable Isotope Facility (SIF) in its current form, effective July 26, 2026.

The Department of Plant Sciences continues to face hard decisions surrounding funding allocation given the campus-wide request to reduce budgets. Over the past several years SIF has been operating with a significant and growing deficit and, despite extensive efforts over the last several months to find a solution that would allow the facility to continue to provide services to the research community, we have not found a model that is financially sustainable.

I want to thank SIF’s staff for their excellent work and dedication these past 25 years, and everyone who has played a role in supporting this facility.

We are committed to doing our best to support the researchers who rely on the facility during this transition, and will be in touch with individual clients about details of specific plans for handling existing orders over the next several weeks.

Sincerely,
Daniel Potter
Professor and Chair, Department of Plant Sciences
University of California, Davis

Original Letter

Compound Specific 13C & 15N analysis of Amino Acids by GC-IRMS Pricing

 

Analysis Turnaround Time for Data (weeks) 2024 Price per Sample (US$) 2025 Price per Sample (US$)
13C or 15N analysis of Amino Acids

contact us
appointment required

 $180.00 $249.50
13C & 15N analysis of Amino Acids

contact us
appointment required

 $320.00 $374.00

 

Price is inclusive of duplicate analysis; triplicate measurements will be made, at no extra charge, if duplicate measurements fall outside typical measurement error. Researchers may request all measurements to be made in triplicate at additional cost. Samples with matrices that require additional preparation requirements (e.g. cation-exchange chromatography) will incur additional costs. Please contact us for details.

 

All projects are accepted on a case-by-case basis and must be scheduled with the SIF prior to sample submission.  Samples arriving at the SIF without prior approval will be returned at the shipper's expense.

As of December 1, 2022, the SIF no longer accepts individual CSIA of amino acids projects totaling greater than 100 samples. By nature, this is not a high-throughput analysis and this restriction has been put in place to allow for equitable service to all SIF clients. If you are planning a project > 100 samples, please contact us to discuss how those projects might be accommodated. We appreciate your understanding.


Shipping
Dry, homogenized samples should be shipped dry in 0.5-1 dram glass vials.  

First, complete and submit the online Analysis Order Form and Sample List for your samples. Shipment may proceed once you receive email confirmation from SIF staff.   Be sure to also include a printed copy with your samples. The SIF uses this form to track your samples and to contact you regarding receipt of samples, data, and invoicing. For mixed analysis requests, we require the completion of a separate form for each type of analysis.

Supplies

Manufacturer / Part#

Description

 Unit

Fisher Scientific / 03-339-22A

0.5 dram (1.8 mL) Fisherbrand Class B Clear Glass Threaded Vials

144/PK

Fisher Scientific / 03-339-22B

1.0 dram (3.7 mL) Fisherbrand Class B Clear Glass Threaded Vials

144/PK