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Multivariate analysis of over 1214 infrared spectra obtained from 35 species allowed us to group silks into distinct hierarchies and a classification that agrees well with current phylogenetic data and taxonomies. This approach also provides information on the relative contents of sericin, calcium oxalate, phenolic compounds, poly-alanine and poly(alanine-glycine) \u03b2-sheets. It emerged that the domesticated mulberry silk-moth Bombyx mori represents an outlier compared to other silk moth taxa in terms of spectral properties. Interestingly, Epiphora bauhiniae was found to contain the highest amount of \u03b2-sheet reported to date for any wild silk-moth. We conclude our approach provides a new route to determine cocoon chemical composition and in turn a novel, biological as well as material, classification of silks.<\/jats:p>","DOI":"10.1242\/jeb.128306","type":"journal-article","created":{"date-parts":[[2015,9,8]],"date-time":"2015-09-08T01:09:55Z","timestamp":1441674595000},"source":"Crossref","is-referenced-by-count":86,"title":["Identification and classification of silks using infrared spectroscopy"],"prefix":"10.1242","author":[{"given":"Maxime","family":"Boulet-Audet","sequence":"first","affiliation":[{"name":"Department of Life Sciences, Imperial College London, London, UK"},{"name":"Department of Zoology, University of Oxford, Oxford, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fritz","family":"Vollrath","sequence":"additional","affiliation":[{"name":"Department of Zoology, University of Oxford, Oxford, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris","family":"Holland","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","reference":[{"key":"2021042509020544600_JEB128306C1","first-page":"157","article-title":"Cancer monitoring by FTIR spectroscopy","volume":"5","author":"Andrus","year":"2006","journal-title":"Technol. 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