You will be shown biomedical passages and your task is to the answer the provided question. Provide a concise and accurate response and do not include any additional text in the response other than the answer.

Question: What is the substrate of the microbial enzyme inulinase?

Context: Inulinases mainly produced by the microorganism and it degrades inulin into fructose which is a digestible form.
Inulin or inulin-rich materials can be actively hydrolyzed by microbial inulinases to produce glucose and fructose syrups that can be used in bioprocesses.
The catalysts treated at these conditions in both fluids were then used for the production of fructooligosaccharides (FOS) using sucrose and inulin as substrates in aqueous and organic systems.
This work is focused on the synthesis of the fructooligosaccharides (FOS) from sucrose and inulin, using free, immobilized and pre-treated immobilized inulinase
Using inulinases from K. marxianus NRRL Y 7571, 11.89% of GF2 and 20.83% of GF3 were obtained, using inulin as substrate.
TLC analysis of end product revealed that inulinase hydrolyzed inulin exclusively into fructose.
One product was an endo-inulinase, and the other was a β-fructofuranosidase. Both enzymes worked together to effectively degrade inulin.
The K (m) and V (max) values of the purified enzyme for inulin were 2.3 mg/mL and 4.8 mg/min, respectively.
Fructans were extracted from Agave salmiana juice, characterized and subjected to hydrolysis process using a commercial inulinase preparation acting freely.
A comparatively lower Michaelis-Menten constant (2.15 mg/ml) and higher maximum initial velocity (115 µmol/min/mg of protein) for inulinase I on inulin demonstrated the exoinulinase's greater affinity for inulin substrate.
Inulin was hydrolyzed by the purified enzyme, yielding d-fructose as the main product.
The inulinase acts on the beta-(2,1)-D-fructoside links in inulin releasing D-fructose.
The inulinase acts on the beta-(2,1)-D-fructoside links in inulin releasing D-fructose.