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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)