Steam-explosion of olive stones: hemicellulose solubilization and enhancement of enzymatic hydrolysis of cellulose

Fernández‐Bolaños, Juan; Felizón, B.; Heredia, Antonia; Rodríguez, Rafael Moreno; Guillén, Rafael; Jiménez, Ana

doi:10.1016/s0960-8524(01)00015-3

Cited by 131 publications

(51 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only Smeti showed little difference in duplicates at 180 C. The average recovery of dry solid residue was 25.06%. This percentage seemed to be low when compared with other products, such as olive stones, treated in the same reactor where the recovery average was 59.12% (Fernandez-Bolaños et al, 2001). It is important to take into account that soluble sugars accounted for more than 50% of date flesh dry weight (Table 1).…”

Section: Hydrothermal Treatments and Overall Recoverymentioning

confidence: 94%

“…NCS also varied with treatments because the hydrothermal treatments lead to a high solubilization of hemicelluloses (Fernandez-Bolaños et al, 2001). In the SET reactor, the FCs were significantly richer in NCS when treated at 180 C than at 200 C, and, except for Smeti at 180 C, there was no difference due to variety.…”

Section: Chemical Composition Of Fcsmentioning

confidence: 99%

“…Among the existing methods, steam explosion treatment (SET) is one of the most commonly used for fractionation of biomass components. The SET technique is very useful for the separation of cellulose, hemicellulose and lignin from raw materials, as wheat straw (Montane, Farriol, & Salvado, 1998), bagasse (Kar, Guti errez, & Kinoshita, 1998), and olive stone (Fernandez-Bolaños et al, 2001). As pressures for SET are very high for usual industrial steam generators (42 kg/cm 2 ), another pretreatment has been developed (Lama-Muñoz, Rodríguez-Guti errez, Rubio-Senent, G omez-Carretero, & Fern andez-Bolaños, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Valorization of Tunisian secondary date varieties (Phoenix dactylifera L.) by hydrothermal treatments: New fiber concentrates with antioxidant properties

Mrabet

Rodríguez-Gutiérrez

Guillén

et al. 2015

LWT - Food Science and Technology

View full text Add to dashboard Cite

a b s t r a c tTwo hydrothermal treatments were assayed on secondary date varieties from the Tunisian coastal oasis in order to obtain valuable solid extracts, rich in dietary fiber and antioxidants. The steam explosion treatment (SET) is based on high temperatures and pressures, with an explosive decompression. The steam treatment (ST), without rapid decompression, has lower pressures and temperatures, but longer treatments than SET. The recovery of the fiber concentrates (FCs) was very similar for the different assayed conditions. Only its granulometry showed differences, increasing the fraction with size lower than 4 mm in more intense treatments. Treatment conditions had higher influence than date variety in the FCs chemical composition. It was approximately 0.1e2% soluble sugar, 0.7e2% uronic acids, 4e8% phenols, 5e11% fat, 5e22% non-cellulosic sugars, 9e14% protein, 12e20% cellulose, and 44e71% lignin, depending on treatment conditions. They had also very high antiradical activity (230e580 mmols Trolox/ Kg FC). The use of ST reactor is highly recommended because it could be easily scaled up to the industry. The FC obtained by hydrothermal treatments from date fruits could be considered as a very interesting ingredient for healthier food, especially for bakery or dairy products due to its pleasant chocolate/coffee flavor.

show abstract

Section: Hydrothermal Treatments and Overall Recoverymentioning

confidence: 94%

Section: Chemical Composition Of Fcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Valorization of Tunisian secondary date varieties (Phoenix dactylifera L.) by hydrothermal treatments: New fiber concentrates with antioxidant properties

Mrabet

Rodríguez-Gutiérrez

Guillén

et al. 2015

LWT - Food Science and Technology

View full text Add to dashboard Cite

show abstract

“…Because of their high heating value, roughly 20.0 MJ·kg −1 (Skoulouet al, 2009), the main current application of olive stones is their direct combustion to convert dry biomass into heat or electricity by means of stoves, furnaces, boilers and turbo-generators. However, this biomass has a high content of hemicellulose, ranging between 21.9% (Fernández-Bolaños et al, 2001) and 28.1% , which is a potential source of D-xylose. What is more, the removal of hemicellulose (which has lower heating power than cellulose and lignin) from olive stones would increase the heating power of this biomass.…”

Section: Introductionmentioning

confidence: 99%

“…Few studies deal with D-xylose production; the works are mainly focused on D-glucose and later ethanol production by autohydrolysis, enzymatic hydrolysis, simultaneous saccharification and fermentation, and yeast fermentation (Fernández-Bolaños et al, 2001;Ballesteros et al, 2002;Cuevas et al, 2009). Furfural production has also been assayed with dilute acid hydrolysis as it is an important renewable, non-petroleum based, chemical feedstock (Montané et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Influence of solid loading on D-xylose production through dilute sulphuric acid hydrolysis of olive stones

Cuevas¹,

Saleh²,

García‐Martín³

et al. 2015

Grasas y Aceites

View full text Add to dashboard Cite

SUMMARY:The selective hydrolysis of hemicellulose from olive stones was attempted in order to achieve a maximum D-xylose yield. For this aim, batch hydrolysis was conducted under different operating conditions of temperature, acid concentration and solid loading. Firstly, distilled water, sulphuric acid and nitric acid were assessed as hydrolytic agents at different temperatures (200, 205, 210 and 220 °C) and at a fixed acid concentration (0.025 M). Sulphuric acid and 200 °C were selected for the subsequent dilute acid hydrolysis optimization based on the obtained D-xylose yields. The combined influence of solid loading (from 29.3 to 170.7 g olive stones into 300 mL acid solution) and sulphuric acid concentration (0.006-0.034 M) on the release of D-xylose was then estimated by response surface methodology. According to a statistical analysis, both parameters had significant interaction effects on D-xylose production. The results illustrated that the higher the solid loading, the higher the required acid concentration. The decrease in the solid/liquid ratio in the reactor had a positive effect on D-xylose extraction and on the amount of acid used. The optimum solid loading and sulphuric acid concentration were determined to be 50 g (solid/liquid ratio 1/6) and 0.016 M, respectively. Under these conditions, the predicted D-xylose yield (expressed as g of sugar per 100 g of dry matter fed) was 20.4 (87.2% of maximum attainable). KEYWORDS: D-xylose; Dilute acid hydrolysis; Hemicellulose; Olive stones; Response surface methodologyRESUMEN: Influencia de la carga de sólido en la producción de D-xilosa mediante hidrólisis del hueso de aceituna con ácido sulfúrico diluido. Se ha desarrollado una hidrólisis selectiva de la fracción hemicelulósica del hueso de aceituna con el fin de obtener el máximo rendimiento de D-xilosa. Para ello las hidrólisis se llevaron a cabo en un reactor discontinuo a distintas condiciones de temperatura, concentración de ácido y carga de sólidos. En primer lugar se evaluó la capacidad hidrolítica del agua destilada y de los ácidos nítrico y sulfúrico a distintas temperaturas (200, 205, 210 y 220°C) manteniendo fija la concentración de ácido (0,025 M). A partir de los rendimientos en D-xilosa obtenidos se seleccionó el ácido sulfúrico y una temperatura de 200 °C para la posterior optimización del proceso. La influencia conjunta de la carga de sólidos (desde 29,3 a 170,7 g de hueso de aceituna en 300 mL de disolución ácida) y de la concentración de ácido sulfúrico (0,006-0,034 M) sobre los rendimientos de D-xilosa fue determinada mediante metodología de superficie de respuesta. Según el análisis estadístico ambos parámetros tuvieron un efecto interactivo significativo en la producción de D-xilosa. Los resultados mostraron que se requiere mayor concentración de ácido a mayor carga de sólidos. La disminución de la relación sólido/líquido en el reactor tuvo un efecto positivo en la extracción de D-xilosa y en la cantidad de ácido utilizado. Las condiciones óptimas fueron 50 g de sólidos (relación ...

show abstract

Integrated olive mill waste (OMW) processing toward complete by‐product recovery of functional components

Goula¹,

Gerasopoulos²

2017

Olives and Olive Oil as Functional Foods

View full text Add to dashboard Cite

Steam-explosion of olive stones: hemicellulose solubilization and enhancement of enzymatic hydrolysis of cellulose

Cited by 131 publications

References 17 publications

Valorization of Tunisian secondary date varieties (Phoenix dactylifera L.) by hydrothermal treatments: New fiber concentrates with antioxidant properties

Valorization of Tunisian secondary date varieties (Phoenix dactylifera L.) by hydrothermal treatments: New fiber concentrates with antioxidant properties

Influence of solid loading on D-xylose production through dilute sulphuric acid hydrolysis of olive stones

Integrated olive mill waste (OMW) processing toward complete by‐product recovery of functional components

Contact Info

Product

Resources

About