Impact of Power Ultrasound on Antihypertensive Activity, Functional Properties, and Thermal Stability of Rapeseed Protein Hydrolysates

Table 1

Amino acid composition of rapeseed protein hydrolysates with and without ultrasound pretreatment.

Amino acids	Content mg mg^−1		Percent increase %
	RPH	US-RPH
Asp D (aspartic acid)	8.09	8.12
Thr T (threonine)	4.96	4.63
Ser S (serine)	4.96	4.85
Glu E (glutamic acid)	21.49	20.86
Gly G (glycine)	5.89	5.80
Ala A (alanine)	5.12	5.30
Cys C (cysteine)	1.89	1.57
Val V (valine)	5.43	5.63
Met M (methionine)	1.19	1.60
Ile I (isoleucine)	4.07	4.53
Leu L (leucine)	7.92	8.53
Tyr Y (tyrosine)	2.85	3.45
Phe F (phenylalanine)	4.42	4.59
His H (histidine)	4.05	3.84
Lys K (lysine)	5.63	4.97
Arg R (arginine)	6.37	5.94
Trp W (tryptophan)	ND	ND
Pro P (proline)	5.67	5.81	2.47
Asn N (asparagine)	ND	ND
Glu Q (glutamine)	ND	ND
HAAs	38.56	40.99	6.31
SCAAs	3.08	3.16	2.59
EAAs	54.16	55.38	2.26

RPH (rapeseed protein hydrolysates without ultrasound pretreatment), US-RPH (rapeseed protein hydrolysate with ultrasound pretreatment), HAAs (hydrophobic amino acids: cysteine, valine, isoleucine, leucine, alanine, tyrosine, phenylalanine, methionine, and proline), EAAs (essential amino acids: threonine, tyrosine, cysteine, lysine, histidine, arginine, valine, leucine, isoleucine, and methionine), and SCAAs (sulphur-containing amino acids: cysteine and methionine). Ultrasound pretreatment conditions 600 W and pretreatment 12 min.