The properties of PLA depend on the ratio of the two optical isomers of lactate (D-lactate and L-lactate).
ðə pɹˈɑːpɚɾiz ʌv pˌiːˌɛlˈeɪ dᵻpˈɛnd ɔnðə ɹˈeɪʃɪˌoʊ ʌvðə tˈuː ˈɑːptɪkəl ˈaɪsəmɚz ʌv lˈækteɪt dˈiːlˈækteɪt ænd ˈɛllˈækteɪt.