Table 1.

Quantitative analysis of the exudates of Lyophyllum sp. strain Karsten and Trichoderma asperellum 302 for the identification of oxalic acid, using high-performance liquid chromatography (HPLC). Oxalic acid was used as an external standard and M9 medium as a negative control.

Compounds	Retention time (min)	Area	Height	Concentration % (w/v)
MilliQ	0.00	0	0	0.000
Oxalic acid_0.01%	2.48	386,101	27,450	0.010
Oxalic acid_0.01%	2.48	369,726	27,375	0.010
Oxalic acid_0.05%	2.39	5,071,290	562,392	0.051
Oxalic acid_0.05%	2.39	5,033,482	567,899	0.051
Oxalic acid_0.10%	2.39	9,400,274	1,084,105	0.099
Oxalic acid_0.10%	2.38	9,960,133	1,074,788	0.102
M9 medium	2.37	86,273	12,120	0.001
M9 medium	2.37	103,940	14,645	0.001
M9+0.1% Oxalic acid	2.37	8,007,944	1,290,413	0.092
M9+0.1% Oxalic acid	2.38	8,026,472	1,301,304	0.092
Lyophyllum sp. strain Karsten	2.41	7,795,023	719,831	0.090
Lyophyllum sp. strain Karsten	2.41	6,417,830	710,125	0.074
Lyophyllum sp. strain Karsten 1:5	2.36	3,554,342	518,881	0.041
Lyophyllum sp. strain Karsten 1:5	2.36	3,243,405	494,120	0.037
Lyophyllum sp. strain Karsten 1:10	2.36	2,205,528	388,395	0.025
Lyophyllum sp. strain Karsten 1:10	2.35	2,217,147	359,645	0.025
T. asperellum 302	2.40	8,137,144	683,484	0.093
T. asperellum 302	2.40	7,592,703	680,421	0.087
T. asperellum 302 1:5	2.36	1,576,896	286,151	0.018
T. asperellum 302 1:5	2.35	1,500,720	262,248	0.017
T. asperellum 302 1:10	2.36	847,009	162,324	0.010
T. asperellum 302 1:10	2.35	848,337	162,203	0.010