Parameter Relative activity (%)* Control (without additives) 100 Metal additives (10 mM)   Co2+ 145 Mn2+ 152 Cu2+ 169 Mg2+ 125 Zn2+ 138 Fe3+ 186 Na+ 110 Ba2+ 107 Hg2+ 38 Cd2+ 87 Pb2+ 90 Ca2+ 111 Ni+ 79 Li+ 81 Detergent additives (1%)   Tween 20 119 Tween 80 114 Triton X-100 103 Sodium dodecyl sulphate (SDS) 41 Sodium tripolyphosphate 29 Sodium tetraborate 50 Protease inhibitors (mM) Paramethylsulfonyl fluoride (PMSF)   10 21 50 0 p-Chloromercuribenzoate (PCMB)   10 100 50 100 Iodoacetamide   10 100 50 98 1,10- Phenanthroline   10 97 50 89 Dithiothreitol ( DTT)   10 99 50 95 EDTA   10 100 50 100 EGTA   10 100 50 96 Organic solvents (50%)   1-Propanol 49 Propyleacetate 70 Benzene 111 Toluene 90 n-Hexane 109 Decanol 94 Isooctane 100 Tetradecane 102 n-Hexadecane 108 Ethyl acetate 60

*One hundred percent (%) was assigned to the activity in the absence of these chemical additives

Table 10: Some factors affecting xylanase activity produced by Streptomyces sp. ESRAA-301097.