The United States of America as Represented by the Secretary of

The Catholic University of America

Environmental Analytical Systems, Inc.

Gary R Beecher

Frederick Khachik

Peter Edgar Hare

John E Jordan

Betty W Li

David L Kemper

Kent K Stewart

(all-E)-2,7,-dimethylocta-2,4,6-triene-1,8-dial-.sup.13 C.sub.4 is synthesized from commercially available and relatively inexpensive starting compounds, and the key starting compound is triethyl phosphonoacetate-.sup.13 C.sub.2. The .sup.13 C labeled dial is useful as an intermediate in synthesizing .sup.13 C labeled carotenoids.

Synthesis of (all-E)-2,7,-dimethylocta-2,4,6-triene-1,8-dial.sup.13 C.sub.4

Apparatus and method for determination of concentrations of a substance in solution in a sample by determining the time between when the substance first appears and when it disappears. The time between the appearance and the disappearance of the substance is used to determine the concentrations of the substance in a sample. The apparatus includes many elements of a flow injection analysis system but also includes a very important stirred dilution chamber that enables the apparatus to use a simplified detection system that is capable of being used over a wide range of sample concentrations. The apparatus can include a microwave digestion system and in one embodiment a continuous flow microwave digestion system.

Apparatus and method for determination of concentrations

An apparatus and method for automatically analyzing up to 150 samples per hour with high precision. Air segmentation and its concomitant limitations and drawbacks are eliminated by use of a novel stream sampling valve which transfers a predetermined volume of sample only from a sample flow system to a reaction flow system.

Apparatus and method for rapid analyses of plurality of samples

Growing community of inventors

Laurel, MD, United States of America

Gary R Beecher