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The emergence of chirality in enantioselective autocatalysis for compoundsunable to transform according to the Frank-like reaction network is discussedwith respect to the controversial limited enantioselectivity (LES) modelcomposed of coupled enantioselective and non-enantioselective autocatalyses.The LES model cannot lead to spontaneous mirror symmetry breaking (SMSB) eitherin closed systems with a homogeneous temperature distribution nor in closedsystems with a stationary non-uniform temperature distribution. However,simulations of chemical kinetics in a two-compartment model demonstrate thatSMSB may occur if both autocatalytic reactions are spatially separated atdifferent temperatures in different compartments but coupled under the actionof a continous internal flow. In such conditions the system can evolve, forcertain reaction and system parameters, towards a chiral stationary state,i.e., the system is able to reach a bifurcation point leading to SMSB.Numerical simulations using reasonable chemical parameters suggest that anadequate scenario for such a SMSB would be that of abyssal hydrothermal vents,by virtue of the typical temperature gradients found there and the role ofinorganic solids mediating chemical reactions in an enzyme-like role.

astrobiology

Spontaneous Mirror Symmetry Breaking in the Limited Enantioselective  Autocatalysis Model: Abyssal Hydrothermal Vents as Scenario for the Emergence  of Chirality in Prebiotic Chemistry