geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Nonbitter protein hydrolysates


, : Nonbitter protein hydrolysates. Canadian Institute of Food Science & Technology Journal 14(1): 49-52

Deboned, defatted chicken meat was reacted with pancreatin to produce a bitter hydrolysate as judged by a trained sensory panel. The hydrolysis was carried out at 60.degree. C, an enzyme concentration of 4.3%, pH of 8.55 (carbonate buffer) and a salt concentration of 0.6 M (KCl). These conditions resulted in > 95% substrate solubility after 120 min. Enzyme activity was monitored by formol titration. Samples for sensory analysis and .alpha. amino nitrogen were taken after 0, 30, 60, 90 and 120 min, and it was found that when chicken alone was reacted with enzyme a steady increase in bitterness was perceived by the panel up to 90 min, reaching a level equivalent in quinine concentration to > 0.003%. The .alpha. amino nitrogen curve was similar in shape to that for bitterness, increasing from .apprx. 6 to 23 mg/g total protein. When gelatin was added (1:1 protein basis, enzyme level constant) the .alpha. amino nitrogen curve was not substantially altered but no significant increase in bitterness was perceived. When glycine, which is a sweet amino acid found in large quantities in gelatin, was added to the chicken hydrolysate at the same level that would have been in a chicken: gelatin preparation, it significantly reduced bitterness while proline and hydroxyproline alone did not. The mechanism by which gelatin affects protein hydrolysate may be the ability of the endogenous amino acid glycine to mask bitterness.

US$19.90

DOI: 10.1016/S0315-5463(81)72676-2


Other references

Rowland, JM., 1973: New whipscorpions from New Guinea and the Solomon lslands (Thelyphonida, Arachnida). Occasional Papers Museum Texas Tech University, 10: 1-8

Juhasz, A.; Engi, H.; Hamari, Z.; Kevei, F., 2003: Interpretation of mtDNA polymorphisms of Aspergillus tubingensis strains. FEMS Congress of European Microbiologists Abstract Book (1): 204

Wasserman, D.I.; Wang, H.G.; Rashid, A.J.; Josselyn, S.A.; Yeomans, J.S., 2014: Cholinergic control of morphine-induced locomotion in rostromedial tegmental nucleus versus ventral tegmental area sites. M5 muscarinic acetylcholine receptors expressed on ventral tegmental dopamine (DA) neurons are needed for opioid activation of DA outputs. Here, the M5 receptor gene was bilaterally transfected into neurons in the ventral tegmental area (VTA) or t...

Matsui K.; Shibata Y.; Kajiwara T.; Hatanaka A., 1989: Separation of 13 and 9 hydroperoxide lyase activities in cotyledons of cucumber seedlings. In cucumber cotyledons, both C6- and C9-aldehyde were formed via hydroperoxide (HPO) lyase activity. Because it has not been elucidated whether these activities are attributed to one enzyme which can cleave both 13- and 9-HPO or to two or more enz...

Oliaro, T., 1959: Author's code of honour. Panminerva Medica 1: 153-155

Yastrebov, V.K., 1995: On the functional pattern of natural disease foci. Meditsinskaya Parazitologiya i Parazitarnye Bolezni 0(2): 58-59

Samuel N.L.oma; James L.C.rter, 1993: Understanding the toxicity of contaminants in sediments; beyond the bioassay-based paradigm. Environmental Toxicology and Chemistry 12(5): 793-796

Sharma, A.; Ngan, B-Yee.; Sándor, G.K.B.; Campisi, P.; Forte, V., 2008: Pediatric aggressive fibromatosis of the head and neck: a 20-year retrospective review. Aggressive fibromatosis in children is a rare, benign condition that is locally infiltrative and destructive. It often presents as a rapidly growing, painless lump in the head and neck region. To date, only small series and case reports have been...

Zhang, Y.; Hu, P.; Shun, L.; Zhu, X.; Yi, Y.; Liu, W., 2006: External approach microsurgery of retinal dialysis. To explore the effect of external approach microsurgery in retinal dialysis. Consecutive 30 eyes of 28 patients with retinal dialysis were enrolled for this study. The progresses of the external approach microsurgery were following. Under the surg...

Sattayatewa, C.; Arnaldos, M.; Pagilla, K., 2011: Measurement of organic nitrogen and phosphorus fractions at very low concentrations in wastewater effluents. The purpose of this study was to develop simple, accurate, and inexpensive measurement protocols for dissolved organic nitrogen (DON) and dissolved non-reactive phosphorus (DNRP) at low levels in wastewater effluents. Two protocols are presented--...