Reference

Enzymes & biocatalysis

Kinetics and immobilisation, in-vitro polymer synthesis, catalysis on hydrocarbons and detergents — industrial enzymes from reactor to retail shelf.

An enzyme picks its molecule more precisely than any catalyst, but pays with fragility: selectivity demands a flexible active-site geometry, longevity a rigid structure, and enzyme engineering always buys one at the other’s expense. That is the cluster’s first through-line.

The second is water as the master variable. The hydration shell keeps the protein alive, yet water pushes equilibrium back toward hydrolysis; so both in-vitro polymer synthesis and a detergent formula on the shelf reduce to one question — how much water to leave. The third through-line is surfaces: on a hydrophobic substrate an enzyme works only at the phase boundary, and it is interfacial area, not enzyme concentration, that sets the pace.

The cluster ends in household chemistry deliberately: the same catalysis that works in a reactor under controlled conditions must survive for months, dilute, on a warm shelf — and that turns out to be the hardest part.

Start with industrial enzymes & biocatalysis: kinetics, immobilisation and the activity–stability trade set the cluster’s vocabulary.

  • Industrial enzymes and biocatalysis Why enzymes are regio- and stereoselective, what the Michaelis–Menten constants mean for process design, how immobilisation changes the rate law, and why engineering for stability tends to cost activity.
  • Enzymatic polymer synthesis in vitro How phosphorylases and lipases build glucans and polyesters stepwise, why water activity — not water content — is the variable the enzyme actually senses, and what sets the attainable chain length.
  • Biocatalysis in petrochemistry Why hydrophobic feedstocks force interfacial catalysis, what a bound hydration shell does for an enzyme in organic solvent, and where solvent tolerance, mass transfer and cofactor costs set the ceiling.
  • Bio-degreasing How lipases convert an insoluble triglyceride film into dispersible products, why the fatty-acid soap formed becomes part of the mechanism, and where temperature windows, mineral oils and emulsion breaking set the limits.
  • Bio-clean-in-place Which enzyme class attacks which soil in a food-plant cleaning loop, why contact time replaces temperature as the input, and where the caustic or acid step still cannot be skipped.
  • Bio all-purpose home cleaners Why dilute enzymes in a bottle degrade each other and themselves, what calcium, inhibitors and polyols do about it, and why dwell time on the surface, not cleaning power, caps what a consumer enzyme product can do.