OrangerV1, Main, Exploration, bibRecord, 002008

Submerged citric acid fermentation on orange peel autohydrolysate.

Identifieur interne : 002008 ( Main/Exploration ); précédent : 002007; suivant : 002009

Submerged citric acid fermentation on orange peel autohydrolysate.

Auteurs : Beatriz Rivas [Espagne] ; Ana Torrado ; Paolo Torre ; Attilio Converti ; José Manuel Domínguez

Source :

Journal of agricultural and food chemistry [ 0021-8561 ] ; 2008.

RBID : pubmed:18321055

English descriptors

KwdEn :
- Beverages, Calcium Carbonate (pharmacology), Citric Acid (metabolism), Citrus sinensis (metabolism), Fermentation, Fruit (chemistry), Fruit (metabolism), Hydrolysis, Industrial Waste, Methanol (pharmacology).
MESH :
- chemical , metabolism : Citric Acid.
- chemical , pharmacology : Calcium Carbonate, Methanol.
- chemistry : Fruit.
- metabolism : Citrus sinensis, Fruit.
- Beverages, Fermentation, Hydrolysis, Industrial Waste.

Abstract

The citrus-processing industry generates in the Mediterranean area huge amounts of orange peel as a byproduct from the industrial extraction of citrus juices. To reduce its environmental impact as well as to provide an extra profit, this residue was investigated in this study as an alternative substrate for the fermentative production of citric acid. Orange peel contained 16.9% soluble sugars, 9.21% cellulose, 10.5% hemicellulose, and 42.5% pectin as the most important components. To get solutions rich in soluble and starchy sugars to be used as a carbon source for citric acid fermentation, this raw material was submitted to autohydrolysis, a process that does not make use of any acidic catalyst. Liquors obtained by this process under optimum conditions (temperature of 130 degrees C and a liquid/solid ratio of 8.0 g/g) contained 38.2 g/L free sugars (8.3 g/L sucrose, 13.7 g/L glucose, and 16.2 g/L fructose) and significant amounts of metals, particularly Mg, Ca, Zn, and K. Without additional nutrients, these liquors were employed for citric acid production by Aspergillus niger CECT 2090 (ATCC 9142, NRRL 599). Addition of calcium carbonate enhanced citric acid production because it prevented progressive acidification of the medium. Moreover, the influence of methanol addition on citric acid formation was investigated. Under the best conditions (40 mL of methanol/kg of medium), an effective conversion of sugars into citric acid was ensured (maximum citric acid concentration of 9.2 g/L, volumetric productivity of 0.128 g/(L.h), and yield of product on consumed sugars of 0.53 g/g), hence demonstrating the potential of orange peel wastes as an alternative raw material for citric acid fermentation.

DOI: 10.1021/jf073388r
PubMed: 18321055

Affiliations:

Le document en format XML

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<author><name sortKey="Converti, Attilio" sort="Converti, Attilio" uniqKey="Converti A" first="Attilio" last="Converti">Attilio Converti</name>
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<author><name sortKey="Dominguez, Jose Manuel" sort="Dominguez, Jose Manuel" uniqKey="Dominguez J" first="José Manuel" last="Domínguez">José Manuel Domínguez</name>
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<affiliation wicri:level="2"><nlm:affiliation>Departmento de Ingeniería Química, Universidad de Vigo (Campus Ourense), Edificio Politécnico, As Lagoas, 32004 Ourense, Spain.</nlm:affiliation>
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<author><name sortKey="Converti, Attilio" sort="Converti, Attilio" uniqKey="Converti A" first="Attilio" last="Converti">Attilio Converti</name>
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<term>Citrus sinensis (metabolism)</term>
<term>Fermentation</term>
<term>Fruit (chemistry)</term>
<term>Fruit (metabolism)</term>
<term>Hydrolysis</term>
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<front><div type="abstract" xml:lang="en">The citrus-processing industry generates in the Mediterranean area huge amounts of orange peel as a byproduct from the industrial extraction of citrus juices. To reduce its environmental impact as well as to provide an extra profit, this residue was investigated in this study as an alternative substrate for the fermentative production of citric acid. Orange peel contained 16.9% soluble sugars, 9.21% cellulose, 10.5% hemicellulose, and 42.5% pectin as the most important components. To get solutions rich in soluble and starchy sugars to be used as a carbon source for citric acid fermentation, this raw material was submitted to autohydrolysis, a process that does not make use of any acidic catalyst. Liquors obtained by this process under optimum conditions (temperature of 130 degrees C and a liquid/solid ratio of 8.0 g/g) contained 38.2 g/L free sugars (8.3 g/L sucrose, 13.7 g/L glucose, and 16.2 g/L fructose) and significant amounts of metals, particularly Mg, Ca, Zn, and K. Without additional nutrients, these liquors were employed for citric acid production by Aspergillus niger CECT 2090 (ATCC 9142, NRRL 599). Addition of calcium carbonate enhanced citric acid production because it prevented progressive acidification of the medium. Moreover, the influence of methanol addition on citric acid formation was investigated. Under the best conditions (40 mL of methanol/kg of medium), an effective conversion of sugars into citric acid was ensured (maximum citric acid concentration of 9.2 g/L, volumetric productivity of 0.128 g/(L.h), and yield of product on consumed sugars of 0.53 g/g), hence demonstrating the potential of orange peel wastes as an alternative raw material for citric acid fermentation.</div>
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<name sortKey="Torre, Paolo" sort="Torre, Paolo" uniqKey="Torre P" first="Paolo" last="Torre">Paolo Torre</name>
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<country name="Espagne"><region name="Galice"><name sortKey="Rivas, Beatriz" sort="Rivas, Beatriz" uniqKey="Rivas B" first="Beatriz" last="Rivas">Beatriz Rivas</name>
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Submerged citric acid fermentation on orange peel autohydrolysate.

Submerged citric acid fermentation on orange peel autohydrolysate.

Source :

English descriptors

Abstract

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Le document en format XML

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