Structure and properties of sugar beet fibres

Abstract

Fibrous fractions were prepared from sugar beet pulp (RF) by sequential extractions with potassium oxalate, 0.05 M hydrochloric acid at 85°C and 0.05 M sodium hydroxide at 4°C. The overall composition, polysaccharide structure and some physico-chemical properties (cation exchange capacity, CEC; water holding capacity, W H C ; swelling) of each fraction were determined. RF was mostly composed of carbohydrates (66.3 %) with minor amounts of ash, proteins and lignin. The main polysaccharides were highly methylated and acetylated pectins, cellulose and arabinans. The oxalate residue (82.1 % of RF) exhibited only minute differences from RF whereas the acidic and alkaline residues,accounting for 42.8 %and 35.5 % of RF, respectively, were enriched in cellulose and hemicelluloses (xylans, xyloglucans, mannans) and mostly devoid of pectins and arabinans. CEC and WHC of fractions were closely related to the content of unmethylated galacturonic acid residues. The influence of the ionic form of ionisable groups was demonstrated, the Na' form giving the highest WHC. The ionic strength of the medium can reduce the WHC, especially in the case of the acid-and alkali-extracted fibres.

Replacement of digestible fibre by starch in the diet of the growing rabbit. I. Effects on digestion, rate of passage and retention of nutrients

“…Thus, the lignocellulose fraction was provided for about 40% by beet pulp and wheat bran in the A12 diet, whereas these ingredients were lacking in the A24 diet. The high accessibility of the pulp cellulose by bacteria has already been reported [3], thus explaining the highest digestion of the lignocellulose fraction. Similar results were obtained in other studies, but without a complete control of the lignocellulose supply [8,28,32].…”

Effect of crude protein concentration and sugar-beet pulp on nutrient digestibility, nitrogen excretion, intestinal fermentation and manure ammonia and odour emissions from finisher pigs

“…Pectins are a highly soluble non-starch polysaccharide (Bertin et al, 1988) and have been shown to be extensively degraded (Robertson et al, 1987). The reduction in the digestibility of DM, ash, GE and N in pigs offered SBP-based diets is in contrast to the increase in the digestibility of NDF.…”

Comparison of Pectins from the Alcohol-insoluble Residue of Japanese Pepper (Zanthoxylum piperitum DC.) Fruit, a Major By-product of Antioxidant Extraction

“…Sequential extraction of pectins Pectins are usually obtained from alcohol insoluble residues by sequential extraction with water, chelating agents (oxalate, ethylenediaminetetraacetate or hexametaphosphate), hot dilute acid, and cold dilute alkali (Bertin et al, 1988). In this study, the use of water, sodium oxalate, hot 0.05 M HCl and cold 0.05 M NaOH provided a fraction of pectins (Table 2).…”

“…Sequential extraction Sequential extraction of pectins from the AIR was based on the method described by Bertin et al (1988). The extraction volume was adjusted to 60 mL/g of the AIR and kept constant throughout the entire extraction sequence.…”