“…Next, we recently confirmed that several organic acids with molecular sizes comparable to those of glucose, including gluconic acid, a two-electron oxidation product of glucose, permeated through the bilayer lipid membrane via the AmB channels. 13 The product that is smaller than the AmB channel is likely to flow out of the liposome; the lack of the product outside the liposome will drive diffusion of the product into the bulk solution. This outflow may contribute to stabilization of the current by minimizing reverse reactions; the enzymes and the cofactor remain in the capsule because they are not able to permeate the AmB channels.…”