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Table 2 Comparative nutritional profile of protein in heterotrophic Chlorella vulgaris and soybean

From: Effects of C/N ratio on the growth and protein accumulation of heterotrophic Chlorella in broken rice hydrolysate

Parameter

Heterotrophic C. vulgaris

Soybean

C/N = 5:1

C/N = 12:1

C/N = 32:1

Total essential amino acids without histidine

19.61 ± 0.07a

19.37 ± 0.11a

10.92 ± 0.04c

17.09 ± 0.01b

Total non-essential amino acids

29.22 ± 0.04a

26.97 ± 0.11b

14.82 ± 0.05c

26.76 ± 0.06b

Total amino acids

48.83 ± 0.11a

46.34 ± 0.23b

25.74 ± 0.09d

43.85 ± 0.06c

E/T (%)

40.16 ± 0.05c

41.80 ± 0.04b

42.43 ± 0.01a

38.97 ± 0.06d

BV

84.87 ± 0.33a

85.39 ± 0.01a

83.29 ± 0.67a

84.25 ± 0.91a

EAAI

88.60 ± 0.31a

89.07 ± 0.01a

87.15 ± 0.61a

88.03 ± 0.84a

Total Sulphur containing amino acids

0.75 ± 0.02a

0.78 ± 0.01a

0.36 ± 0.02b

0.62 ± 0.05a

Total essential amino acids with histidine

20.60 ± 0.08a

20.36 ± 0.13a

11.46 ± 0.05c

18.23 ± 0.00b

Total neutral amino acids

28.15 ± 0.06a

27.68 ± 0.15b

15.25 ± 0.05c

23.38 ± 0.01d

Total aromatic acids

3.96 ± 0.03a

3.95 ± 0.03a

2.04 ± 0.01c

3.73 ± 0.00b

Total hydroxylic amino acids

4.61 ± 0.02a

4.43 ± 0.01b

2.58 ± 0.01d

4.02 ± 0.01c

Total acidic amino acids

11.39 ± 0.01b

10.29 ± 0.01c

5.74 ± 0.02d

13.34 ± 0.03a

Total basic amino acids

9.30 ± 0.05a

8.37 ± 0.07b

4.75 ± 0.02d

7.12 ± 0.02c

Leucine/isoleucine ratio (BCAA)

2.90 ± 0.01a

2.90 ± 0.01a

2.83 ± 0.01b

2.38 ± 0.01c

Lysine/arginine ratio

1.03 ± 0.01c

1.21 ± 0.01b

1.52 ± 0.01a

0.84 ± 0.00d

  1. Results are expressed as mean ± standard deviations. Means in the same row with different superscripts are significantly different (P < 0.05)