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(a) Absorption spectra in water-alcohol solutions: Ech—line a1; ι/κ-CRG (C = 2 mg × mL−1)—line a2; differential spectra of CRG/Ech 8:1—line a3; and 25:1—line a4. (b)—Differential spectra of Ech in the phosphate buffer (pH 5.9)—line b1; Ech + lambda-carrageenan—line b2.
