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Table 2 Amino acid composition (% dry weight) of Ensis siliqua, between April 2010 and February 2011

From: Temporal dynamics of amino and fatty acid composition in the razor clam Ensis siliqua (Mollusca: Bivalvia)

Amino acids Spring Summer Autumn Winter
April June August October December February
Essential (EAA)       
 Threonine 2.54 ± 0.03a 2.83 ± 0.19a 2.79 ± 0.05a 2.66 ± 0.08a 2.64 ± 0.05a 2.84 ± 0.10a
 Valine 2.15 ± 0.02a 2.38 ± 0.08b 2.30 ± 0.05ab 2.21 ± 0.11ab 2.13 ± 0.02a 2.36 ± 0.05b
 Methionine 0.90 ± 0.02a 0.97 ± 0.19a 1.10 ± 0.06a 1.13 ± 0.15a 0.89 ± 0.07a 1.04 ± 0.05a
 Isoleucine 1.94 ± 0.02a 2.20 ± 0.09b 2.17 ± 0.05bc 2.08 ± 0.09abc 1.99 ± 0.03ac 2.20 ± 0.07b
 Leucine 3.49 ± 0.03a 4.16 ± 0.22b 4.08 ± 0.17bc 3.87 ± 0.24abc 3.64 ± 0.04ac 4.05 ± 0.18bc
 Phenylalanine 1.85 ± 0.02a 2.06 ± 0.08bc 2.05 ± 0.05abc 1.90 ± 0.11abc 1.86 ± 0.01ab 2.10 ± 0.07c
 Histidine 0.96 ± 0.01abc 1.02 ± 0.03bc 1.00 ± 0.04abc 0.93 ± 0.04ab 0.92 ± 0.02a 1.04 ± 0.03c
 Lysine 3.64 ± 0.19ab 4.21 ± 0.08a 3.83 ± 0.36ab 3.59 ± 0.10b 3.46 ± 0.06b 3.98 ± 0.26ab
 Arginine 3.71 ± 0.03ab 4.25 ± 0.05ab 4.54 ± 0.13a 4.01 ± 0.32ab 3.20 ± 0.04b 4.09 ± 0.56ab
 ∑EAA 21.19 ± 0.24ab 24.08 ± 0.68c 23.86 ± 1.04c 22.39 ± 1.28abc 20.73 ± 0.21a 23.70 ± 1.38bc
Non-essential (NEAA)       
 Aspartic acid 4.78 ± 0.06a 5.58 ± 0.29ab 5.78 ± 0.16b 5.34 ± 0.32ab 4.96 ± 0.03ab 5.56 ± 0.27ab
 Tyrosine 1.70 ± 0.01a 1.94 ± 0.08b 1.94 ± 0.06b 1.82 ± 0.11ab 1.73 ± 0.01a 1.96 ± 0.05b
 Serine 2.41 ± 0.01ab 2.59 ± 0.05a 2.50 ± 0.09ab 2.35 ± 0.15ab 2.31 ± 0.01b 2.50 ± 0.08ab
 Glutamic acid 7.12 ± 0.09a 8.58 ± 0.43bc 8.67 ± 0.30c 8.17 ± 0.48abc 7.46 ± 0.09ab 8.21 ± 0.54abc
 Glycine 5.17 ± 0.10ab 5.87 ± 0.30bc 6.11 ± 0.22c 5.83 ± 0.38bc 4.86 ± 0.03bd 4.23 ± 0.19d
 Alanine 3.71 ± 0.06ab 4.01 ± 0.17b 3.57 ± 0.11a 3.42 ± 0.13ac 3.05 ± 0.04c 3.34 ± 0.23ac
 Proline 1.82 ± 0.04ab 2.02 ± 0.07ab 1.98 ± 0.07ab 1.77 ± 0.14a 1.83 ± 0.05ab 2.04 ± 0.14b
 ∑NEAA 26.72 ± 0.31a 30.59 ± 1.26b 30.56 ± 1.00b 28.73 ± 1.83ab 26.21 ± 0.12a 27.84 ± 1.63ab
 ∑AA 47.91 ± 0.18a 54.67 ± 1.83b 54.42 ± 2.04b 51.11 ± 3.08ab 46.94 ± 0.31a 51.53 ± 2.99ab
  1. Different superscript letters within rows represent significant differences (P < 0.05) and should be interpreted in the following exemplificative manner: a not ≠ a, a ≠ b, a ≠ c; ab ≠ cd, a not ≠ ab, ab not ≠ bc
  2. Values are means of triplicate samples (+SD). Amino acid essentiality was defined based on Knauer and Southgate (1999)