Table 1 Peaks corresponding to functional groups and changes in indicator biofilms.

Functional group	T₁	T₂	T₃	T₄	T₅	Changes
Stretching vibrations of O-H bonds	55.96	55.51	53.39293	53.13034	51.60894	Decrease
Stretching vibrations of N-H bonds	55.96	55.51	53.39293	53.13034	51.60894	Decrease
Stretching vibrations of C-H bonds	46.15	46.21	46.15738	46.19944	46.27547	Increase
Bending vibrations of O-H bonds	48.11	47.75	47.85358	48.00687	48.18935	Increase
Bending vibrations of N-H bonds	55.64	55.47	58.81899	60.41261	60.29337	Increase
Bending vibrations of C-H bonds	59.24	59.10	61.91734	63.48924	62.70562	Increase
Bending vibrations of C-H bonds	58.58	58.99	65.40272	65.76016	65.30374	Increase
Stretching vibrations of C-N bonds	20.62	20.55	25.00531	28.36906	28.77245	Increase
Stretching vibrations of C-O bonds	20.62	20.55	25.00531	28.36906	28.77245	Increase
Bending vibrations of C-H bonds	68.73	68.04	75.26303	74.16848	71.64724	Increase
Bending vibration of aromatic rings	59.56	59.25	67.88514	70.87242	75.5092	Increase

T₁: fish coated with PVA/NCH-NC without PC; T₂: fish coated with PVA/NCH/PC-NC (0.5% PC); T₃: fish coated with PVA/NCH/PC-NC (1% PC); T₄: fish coated with PVA/NCH/PC-NC (1.5% PC) and code T₅: fish coated with PVA/NCH/PC-NC (2% PC).

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