Riveros et al. (1989) Effect of growth conditions on production of violacein by Chromobacterium violaceum (BB-78 strain). Braz J Med Biol Res. 1989;22(5):569-77.

https://www.ncbi.nlm.nih.gov/pubmed/2620169

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". . . Methionine was the only absolute requirement for growth . . . The highest yields of violacein were obtained by incubation in liquid medium and in the absence of light at pH 7.0 and 28 degrees C for 24 h."

Please check this useful link.

https://www.researchgate.net/publication/306322289_PERSPECTIVE_APPROACH_ON_REACTOR_DESIGN_FOR_SURFACE_CULTIVATION_OF_CHROMOBACTERIUM_VIOLACEUM

Conference Paper PERSPECTIVE APPROACH ON REACTOR DESIGN FOR SURFACE CULTIVATI...

Dear Laila Karomah

Pls. find the attached files

Page 102 in: Ronald M. Atlas. 2005. Handbook of Media for Environmental Microbiology, Second Edition CRC Press,Pp.672 ISBN 142003748X, 9781420037487

Page 369 in: Ronald M. Atlas. 2004. Handbook of Microbiological Media, Third Edition CRC Press,Pp.2056. ISBN0849318181, 9780849318184

http://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra05765e

http://www.microbiologyresearch.org/docserver/fulltext/ijsem/63/5/1840_ijs045161.pdf?expires=1475851688&id=id&accname=guest&checksum=0952C4C05DD4937C942A30875E210FC3

http://www.nature.com/articles/srep28174

https://www.ncbi.nlm.nih.gov/pubmed/22984138

https://doaj.org/article/d163d06a4649458a99e76f126f4774b2

https://microbewiki.kenyon.edu/index.php/Chromobacterium_violaceum

http://aac.asm.org/content/53/5/2149.full

Hoping this will be helpful, Best of luck

Regards               

Prof. Houda Kawas