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- W2005096593 abstract "Various hydrolysis reaction conditions were examined in order to produce high quality hydrolysate from shrimp waste for its possible use in animal feed and some food products. In a first set of experiments, shrimp waste was hydrolysed with varying concentrations of HCl and samples taken after various hydrolysis times and tested for ninhydrin positive substances (NPS). Twelve hours of hydrolysis with 5N HCl gave maximum NPS yields and was, therefore, chosen as a suitable hydrolysing agent for subsequent hydrolysis trials. In a second set of experiments, shrimp waste samples of varying weights were hydrolysed with 5N HCl for various times and tested for NPS and total amino acids. On a dry weight basis, amino acid contents of all 12 h hydrolysates varied from 29 to 35%. Maximum yields varying from 32 to 37% were achieved when the hydrolysis time was increased to 24 h. Prolonging hydrolysis time to 48 h reduced amino acid yields by 15–20 percent. The amino acid contents decreased with an increase in sample weight. Of the total amino acid contents approximately 40–42% were essential amino acids with considerable amounts of lysine, valine, leucine and threonine. The remaining 58–60% non-essential amino acid fraction was dominated by glutamic and aspartic acids. Diverses conditions d'hydrolyse furent étudiées dans le but de produire des hydrolysats de haute qualité à partir de résidus de crevettes pour emploi possible en alimentation animale et dans quelques produits alimentaires. Dans une première série d'essais, des échantillons de résidus de crevettes séchés de 50 g furent hydrolyses avec 150 mL de ClH 1N, 2N, 3N, 4N, 5N, 6N et 7N. Des échantillons d'hydrolysat prélevés après 3, 6, 12, 24, 30 et 48 h d'hydrolyse furent analysés pour la présence de substances positives à la ninhydrine (SPN). Les rendements en SPN furent maximums après 12 h d'hydrolyse avec ClH 5N. Ces conditions furent par la suite adoptées pour les essais d'hydrolyse subséquents. Dans une deuxième série d'essais, des échantillons de résidus de crevettes pesant 7, 11, 15, 20 et 25 g furent hydrolyses séparément à l'aide de 100 mL de ClH 5N. Des échantillons d'hydrolysat prélevés après 3, 6, 12, 24, 30 et 48 h d'hydrolyse furent analysés pour les teneurs en SPN et en acides aminés totaux. Les teneurs en acides aminés des hydrolysats de 12 h varièrent de 29 à 35% (base sèche). Les rendements maximums variant de 32 à 37% furent réalisés quand le temps d'hydrolyse fut augmenté à 24 h. Un temps d'hydrolyse prolongé à 48 h diminua les rendements en acides aminés de 15–20%. Les teneurs en acides aminés diminuèrent avec l'augmentation du poids de l'échantillon. Des teneurs en acides aminés totaux, il y en a environ 40–42% qui furent des acides aminés essentiels dont une participation importante de la lysine, la valine, la leucine et la threonine. La fraction restante de 58–60% des acides aminés non essentiels fut dominée par les acides glutamique et aspartique." @default.
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- W2005096593 date "1989-12-01" @default.
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- W2005096593 title "Methodology Investigations for the Production of Amino Acid Hydrolysate From Shrimp Waste" @default.
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- W2005096593 doi "https://doi.org/10.1016/s0315-5463(89)70597-6" @default.
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