. 2023 Dec 5;22:248. doi: 10.1186/s12934-023-02256-2

Table 1.

Effect of different organic acids on the biomass productivity (BP, mg L⁻¹ day⁻¹) and the contents (% w/w) and productivities (mg L⁻¹ day⁻¹) of phycocyanin (PC), phycoerythrin (PE), and allophycocyanin (APC) as well as PC purity ratio (A₆₂₀/ A₂₈₀)

Treatment	Biomass productivity	PC			PE		APC
Treatment	Biomass productivity	Content	Productivity	Purity ratio	Content	Productivity	Content	Productivity
Control	84.15 ± 6.00^a	16.92 ± 0.44^a	1.42 ± 0.152^a	0.88 ± 0.004^b	3.42 ± 0.27^b	0.29 ± 0.003^a	4.66 ± 0.26^d	0.39 ± 0.005^b
AA (1 mM)	106.25 ± 0.80^c	24.55 ± 0.37^g	2.61 ± 0.059^e	0.84 ± 0.001^ab	4.58 ± 0.02^fg	0.49 ± 0.006^c	4.05 ± 0.02^bc	0.43 ± 0.005^c
AA (2 mM)	156.54 ± 1.00^f	24.02 ± 0.01^f	3.76 ± 0.023^h	1.74 ± 0.004^f	4.10 ± 0.06^d	0.64 ± 0.014ⁱ	9.37 ± 0.05ⁱ	1.54 ± 0.018^j
AA (3 mM)	164.19 ± 0.20^g	22.40 ± 0.32^d	3.68 ± 0.048^h	1.92 ± 0.004^gh	4.44 ± 0.04^ef	0.73 ± 0.007^k	3.38 ± 0.01^ij	0.33 ± 0.004^l
CA (1 mM)	96.33 ± 0.001^b	19.30 ± 0.01^c	1.86 ± 0.001^b	1.36 ± 0.002^a	4.12 ± 0.01^d	0.40 ± 0.001^b	7.38 ± 0.03^a	0.99 ± 0.003^a
CA (2 mM)	134.16 ± 0.60^e	24.11 ± 0.03^fg	3.23 ± 0.018^f	2.01 ± 0.001^h	6.24 ± 0.04^j	0.84 ± 0.009ⁿ	7.38 ± 0.04^g	0.99 ± 0.010^g
CA (3 mM)	139.26 ± 1.40^e	22.98 ± 0.01^e	3.20 ± 0.032^f	1.59 ± 0.001^e	4.53 ± 0.01 fg	0.63 ± 0.005ⁱ	7.09 ± 0.06^f	0.99 ± 0.019^g
SA (1 mM)	121.83 ± 2.00^d	18.96 ± 0.07^c	2.31 ± 0.047^d	1.03 ± 0.002^c	4.57 ± 0.01 fg	0.56 ± 0.009^fg	3.44 ± 0.01^a	0.42 ± 0.006^c
SA (2 mM)	164.62 ± 0.40^g	25.45 ± 0.27^h	4.19 ± 0.035^j	1.86 ± 0.161^fg	4.27 ± 0.07^de	0.70 ± 0.009^j	9.58 ± 0.02^j	1.58 ± 0.001^m
SA (3 mM)	164.05 ± 0.40^g	26.70 ± 0.01ⁱ	4.38 ± 0.010^k	2.20 ± 0.091ⁱ	4.74 ± 0.01^gi	0.78 ± 0.001^l	10.34 ± 0.00^k	1.70 ± 0.004ⁿ
FA (1 mM)	123.53 ± 0.40^d	18.35 ± 0.04^b	2.27 ± 0.003^d	1.03 ± 0.001^c	4.57 ± 0.01^fg	0.56 ± 0.003^gh	4.23 ± 0.01^c	0.52 ± 0.003^e
FA (2 mM)	171.56 ± 0.20^h	23.29 ± 0.12^e	3.99 ± 0.016ⁱ	2.26 ± 0.101ⁱ	3.13 ± 0.02^a	0.54 ± 0.003^e	8.77 ± 0.05^h	1.51 ± 0.016^k
FA (3 mM)	165.04 ± 1.00^g	24.55 ± 0.07^g	4.05 ± 0.014ⁱ	1.32 ± 0.054^d	4.84 ± 0.01ⁱ	0.80 ± 0.006^m	7.43 ± 0.05^g	1.23 ± 0.016^h
OA (1 mM)	122.68 ± 0.80^d	17.37 ± 0.02^a	2.13 ± 0.016^c	0.78 ± 0.011^ab	4.46 ± 0.01^ef	0.55 ± 0.003^ef	3.92 ± 4.61^b	0.48 ± 0.571^d
OA (2 mM)	124.81 ± 0.20^d	26.58 ± 0.01ⁱ	3.32 ± 0.007^f	1.59 ± 0.022^e	4.60 ± 0.01^fg	0.57 ± 0.001^h	10.49 ± 0.04^k	1.31 ± 0.006ⁱ
OA (3 mM)	134.58 ± 2.00^e	26.31 ± 0.05ⁱ	3.54 ± 0.046^g	3.06 ± 0.162^j	3.86 ± 0.01^c	0.52 ± 0.007^d	6.59 ± 0.01^e	0.89 ± 0.012^f

AA acetic acid, CA citric acid, SA succinic acid, FA fumaric acid, OA oxalic acid

Different superscript letters within columns indicate significant differences at p < 0.05