Ms,t, is the level of nisin while in the simulant at time t; MF,0, level of nisin during the film when t = 0; α, mass ratio among the amount of nisin during the simulant and inside the film at equilibrium; qn, could be the “n” root of tanqn=−αqn; l, https://www.supplementsbymail.com/product-category/bioactive-peptides/