| Summary: | Decellularization offers great potential to the field of tissue engineering, since this method gives rise to scaffold material with the native organ architecture by removing all cellular material and leaving much of the extra-cellular matrix (ECM) intact. However, many parameters may affect decellularization efficacy and ECM retention, and therefore, decellularization protocols need to be optimized for specific needs. This requires robust methods for comparison of decellularized tissue composition. Various representation methods are used in the literature to express tissue composition (DNA, glycosaminoglycans, collagen, other ECM proteins and growth factors). Here, we present and compare the various methods used and demonstrate that normalization to either dry or wet decellularized weight might be misleading and may underestimate true component retention. Moreover, the magnitude of the confounding effect is likely to be decellularization treatment dependent. As a result, we propose alternative comparison strategies: normalization to whole organ, or to a unit of whole initial organ weight. We believe proper assessment of decellularized tissue composition is paramount for the successful comparison of different decellularization protocols and clinical translation.
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