Raw agro-industrial orange peel waste as a low cost effective inducer for alkaline polygalacturonase production from Bacillus licheniformis SHG10

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Table 2 Effect of some medium supplements in citrus pectin based- mineral medium on PGase productivity

Parameter	Relative specific activity (%)^a,b
Control medium^c	100.00
Salts (0.2% w/v):
NaN0₃	145.00
KN0₃	163.80
MgS04	237.70
CaCl₂	198.80
FeS0₄	228.57
(NH₄)₂S0₄	103.60
NH₄Cl	72.41
Yeast extract (0.5%)	60.21

^aSpecific activity (U/mg): calculated as μg galacturonic acid .min^-1. mg protein^-1.
^bAll relative specific activities of PGase were related to U/mg PGase obtained upon using citrus pectin –based basal medium as production medium.
^cCitrus pectin based- basal medium composition as mentioned in materials and methods.