Figure 2From: Production of 3,4-dihydroxy L-phenylalanine by a newly isolated Aspergillus niger and parameter significance analysis by Plackett-Burman designPropagation of A. niger GCBT-8 for L-dopa production. Glucose conc. 6% (w/v), initial pH 5. Standard bars indicate standard deviation (± sd) among the three parallel replicates (L-tyrosine consumed - × -, L-dopa produced - ○ -).Back to article page