An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Dr. Duke's Phytochemical and Ethnobotanical Databases
U.S. Department of Agriculture

 CYSTINE

Download a full report in PDF format
Chemid
CYSTINE
Ubiquitous
Yes

Data Views

List of all chemical plants
Click on column headings to sort table by that column
Plant Part Low PPM High PPM StdDev *Reference
Abelmoschus esculentus Fruit 180.0 1900.0 0.9 *
Acacia farnesiana Seed 700.0 750.0 -1.7 Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar.
Allium cepa Bulb 210.0 2289.0 1.0 USDA's Ag Handbook 8 and sequelae)
Allium sativum var. sativum Bulb 0.0 1560.0 -1.0 *
Allium sativum var. sativum Leaf -- -- -- *
Aloe vera Juice -- -- -- Waller, G. R., Mangiafico, S., Ritchey, C. R. 1978. A Chemical Investigation of Aloe barbadensis. Proc. Okla. Acad. Sci. 58: 69-.
Amaranthus sp. Leaf 290.0 3489.0 0.5 *
Anacardium occidentale Seed 2830.0 2879.0 -0.2 *
Ananas comosus Fruit 20.0 148.0 -0.9 *
Angelica sinensis Root -- -- -- Jim Duke's personal files.
Apium graveolens Pt 40.0 755.0 -- USDA's Ag Handbook 8 and sequelae)
Arachis hypogaea Seed 3290.0 3580.0 0.3 *
Arctium lappa Root 60.0 300.0 -1.2 USDA's Ag Handbook 8 and sequelae)
Artocarpus altilis Fruit 90.0 305.0 -0.8 USDA's Ag Handbook 8 and sequelae)
Artocarpus altilis Seed 1160.0 2655.0 -0.3 USDA's Ag Handbook 8 and sequelae)
Asparagus officinalis Shoot 360.0 4645.0 -1.0 *
Avena sativa Seed 1000.0 5000.0 1.3 Jim Duke's personal files.*
Basella alba Leaf 270.0 3915.0 0.8 *
Bertholletia excelsa Seed 3490.0 3611.0 0.3 USDA's Ag Handbook 8 and sequelae)
Beta vulgaris Root 180.0 1420.0 1.2 USDA's Ag Handbook 8 and sequelae)
Show all rows.
*Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.