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ATR-FTIR spectra of native (hydrated) egg case and purified egg case proteins. (a) Native egg capsule and (b) curve-fitted Amide I spectra of the egg case. (c) Purified Bc-CPs and (d) curve-fitted Amide I of purified Bc-CPs showing secondary structure compositions that are dominated by α-helices (>50%). The α-helix : β-sheet ratio is ∼2.5 in the egg capsule and in the mixture of CP-1 and CP-3, and is significantly lower than that in CP-1 or CP-3 individually.
