Acid hydrolysis of shrimp-shell wastes and the production of single cell protein from the hydrolysate

Ferrer, José; Páez, Gisela; Mármol, Zulay; Ramones, Eduardo; Garcia, H.S.; Forster, C.F.

doi:10.1016/0960-8524(96)00057-0

Cited by 84 publications

(47 citation statements)

References 11 publications

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“…The processing discards from the crustacean industry are mainly shells, viscera, heads and adhered meat. The major components of shells are proteins, chitin and minerals, as well as small amounts of flavourant proteins and c arotenoid pigments Hansen and Illanes, 1994;Ferrer et al, 1996). Direct use of the crab waste for land manuaring or spreading is generally discouraged by the uniquely obnoxious odours of putrefying shells.…”

Section: Suitability Of Chemical Treatments For Extending the Shelf Lmentioning

confidence: 99%

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Use of chitosan for the removal of metal ion contaminants and proteins from water

2007

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Section: Suitability Of Chemical Treatments For Extending the Shelf Lmentioning

confidence: 99%

“…These materials are mainly shells, viscera, heads and adhered meat. The major components of shells are proteins, chitin and minerals, as well as small amounts of flavourant proteins and carotenoid pigments (Hansen and Illanes, 1994;Ferrer et al, 1996).…”

Section: Seafood Processing Discards As Environmental Pollutantsmentioning

confidence: 99%

Use of chitosan for the removal of metal ion contaminants and proteins from water

2007

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“…-Chitin, an abundant polysaccharide of 1,4-linked 2-acetamido-2-deoxy-b-d-glucopyranose (b-d-GlcNAc), is found in animals, fungi, and some bacteria [1], and readily isolated by deproteinization and demineralization of crustacean shells [2]. Chitosans, fully or partially deacetylated chitin derivatives, and their modifications [3] possess antiviral and antimicrobial properties [4], and know a number of applications, being useful in enzyme inhibition and immobilization [5], in grafts copolymerization [6], as carriers for drugs [7] and genes [8], and for biomedical purposes such as wound healing and immunostimulation [9].…”

mentioning

confidence: 99%

2‐Azido‐2‐deoxycellulose: Synthesis and 1,3‐Dipolar Cycloaddition

Zhang

Bernet

Bonnet

et al. 2008

Helvetica Chimica Acta

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Chitosan (1) was prepared by basic hydrolysis of chitin of an average molecular weight of 70000 Da, 1 H-NMR spectra indicating almost complete deacetylation. N-Phthaloylation of 1 yielded the known Nphthaloylchitosan (2), which was tritylated to provide 3a and methoxytritylated to 3b. Dephthaloylation of 3a with NH 2 NH 2 · H 2 O gave the 6-O-tritylated chitosan 4a. Similarly, 3b gave the 6-O-methoxytritylated 4b. CuSO 4 -Catalyzed diazo transfer to 4a yielded 95% of the azide 5a, and uncatalyzed diazo transfer to 4b gave 82% of azide 5b. Further treatment of 5a with CuSO 4 produced 2-azido-2-deoxycellulose (7). Demethoxytritylation of 5b in HCOOH gave 2-azido-2-deoxy-3,6-di-O-formylcellulose (6), which was deformylated to 7. The 1,3-dipolar cycloaddition of 7 to a range of phenyl-, (phenyl)alkyl-, and alkylmonosubstituted alkynes in DMSO in the presence of CuI gave the 1,2,3-triazoles 8 -15 in high yields. 2-Azido-2-deoxycellulose should be available from chitosan by diazo transfer. 1,3-Cycloadditions of 2-azido-2-deoxycellulose to alkynes should introduce 1,2,3-triazolyl side chains into chitosan and formally into cellulose, similarly as it is known for 6-azido-6-deoxypolysaccharides [20] [21] 1 ). In the following, we describe the synthesis of 2-azido-2-deoxycellulose and its reactivity in the 1,3-dipolar cycloaddition to alkynes, leading to new chitin/cellulose derivatives.

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“…The cell mass generated after a 12-h fermentation was 4.86 g L -1 of incubation medium, resulting in a productivity of approximately 2.6 g CP L -1 . Using this same yeast but under a continuous cultivation system based on glucosamine as the fermentation substrate, Ferrer et al (1996) achieved production of 0.447 kg cells DM kg . In another study, the authors Nwabueze and Oguntimein (1987) evaluated this yeast as a protein producer using waste from the industrial processing of sweet oranges (Citrus sinensis) as the fermentation substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of the type of substrate on the chemical composition and productivity of a protein concentrate of yeast origin

2012

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Extracts of Saccharomyces cerevisiae (Sc) yeast were generated using a biotechnological solid-state fermentation method. The organic material used for fermentation consisted of a variety of fibrous substrates of agricultural origin, and their effect on the chemical composition and productivity of cellular biomass generated was evaluated. The substrates studied included the following: wheat straw, WS; barley straw, BS; chili stubble, CS; oat hull, OH and starch powder, SP (control). For incubation with Sc, 2 g of (dry) vegetable substrate were added to 12 mL of cultivation medium. The fermentation time was seven days under aerobic conditions (pH 5, 26ºC). After extraction of the yeast biomass, its chemical composition and productivity were analyzed. The results showed an effect (P≤0.01) of the type of vegetable substrate fermented on the crude protein (CP) and true protein (TP) contents of the yeast biomass. The highest concentration of CP was obtained by fermentation of the control TSP (treatment with the starch powder substrate ) (506.3 g kg -1 DM), followed by the treatment TOH (474.5 g kg -1 DM). The productivity of the yeast biomass was affected by the type of substrate fermented (P≤0.001). The highest value was obtained with TSP (327.10 mg g -1 ), followed by TOH (treatment with the oat hull substrate) (207.08 mg g -1 ). The lowest efficiency was measured in TCS (156.30 mg g -1 ). On the basis of these results, it may be inferred that an extract of high CP can be obtained from yeast (Sc) by the fermentation of fibrous substrates.

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Acid hydrolysis of shrimp-shell wastes and the production of single cell protein from the hydrolysate

Cited by 84 publications

References 11 publications

Use of chitosan for the removal of metal ion contaminants and proteins from water

Use of chitosan for the removal of metal ion contaminants and proteins from water

2‐Azido‐2‐deoxycellulose: Synthesis and 1,3‐Dipolar Cycloaddition

Effect of the type of substrate on the chemical composition and productivity of a protein concentrate of yeast origin

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