Table 3.

Effect of individual and multiple omission of essential vitamins on the xylitol production by C. tropicalis in defined medium

Omission	Xylitol (g/L)	Specific xylitol production (g/g of dry cell weight)a
None	114	10.6
ρ-Aminobenzoic acid	117	10.8
Biotin	2.8	0.27
Calcium pantothenate	118	11.0
Folic acid	114	10.5
Inositol	112	10.2
Niacin	118	10.8
Pyridoxine	113	10.2
Riboflavin	108	10.1
Thiamine	103	9.90
All essential vitaminsb except riboflavin, biotin, and thiamine	119	11.2

^aThe specific xylitol production was calculated from a standard curve of OD₆₀₀ against cell dry weight

^bAll essential vitamins: ρ-Aminobenzoic acid, biotin, calcium pantothenate, folic acid, inositol, niacin, pyridoxine hydrochloride, riboflavin, thiamine