Optical purity, molecular basis

PLA [e.g., see Sodergi d and Stolt [26]] is raie of the most important bio-based and biodegradable thermoplastic polymers commercially available today with some molecular weights and optical purities. First attempts to reinforce PLA with manmade cellulose fibers have been reported in [12], followed by papers of other groups [27-29]. Results are in full agreement with each other and will be reported on the basis of own work in this field [30, 31]. 

The value of the enzyme concentration may not be known in the initial stages of purification, and in its place the dry weight, the nitn en content, or the optical density of the enz3une solution at 280 m/tt may be used. In this case k represents an index of the purity achieved and should reach a constant maximum value when the pure enzyme is obtained. If the molecular weight of the enzyme is then determined, k is recomputed on the basis of the true enzyme concentration. 

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