How much chitosan is produced commercially world-wide?

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Annually, an estimated amount of 35-40,000 metric tons of chitin are extracted from different biological sources, mainly from shrimp and crab shell wastes, but only a very small portion of this chitin is further converted into chitosans. Thus, the current chitosan production probably comes to around 2,000 tons per year, but reliable numbers are not available as the chitin and chitosan market is a very confidential one. Chitosan is produced not only by chitin producers, but many, mostly small companies buy chitin which they then convert into different chitosans, potentially raising quality issues.