Natural gums, which have a polysaccharide backbone, are widely used in the food processing industry as binders, thickeners and texturizing agents. Although all are hydrocolloids and physico-chemical properties of various gums have been described by various workers, there appears to be lack of detailed studies on their functional properties, which show appreciable differences. The present study was carried out to determine the key functional characteristics of commercially important natural gums. These included flow, solubility, water holding capacity and oil holding capacity, angle of repose, bulk and true density, and coefficient of friction. The bulk density of various gums ranged from 0.95-1.20 g/mL, the lowest densities was that of Babool gum and the highest was of Piyar gum. The compressibility index of various gums ranged from 1 to 38.75%. Khair gum showed the highest solubility (83.65%) and Karaya gum showed the lowest solubility (60.06%). Psyllium gum showed the highest water holding capacity whereas gum Acacia showed the lowest value. Oil holding capacity of different gums varied from 114.66 to 214.66 (g oil/100 g gum). Ghatti and Piyar gums (38.13°) showed comparative decrease in angle of repose, whereas Guar gum showed an angle of repose of 39.80°.

The effect of edible coating using gum arabic on biochemical, microbiological, textural and sensory characteristics of fresh gutted mackerel stored at 4 °C was investigated. The results were further compared against the samples packed under vacuum (VP) and conventional polyethylene pouches (CP). Coating with gum arabic (GC) markedly retarded lipid oxidation process in gutted mackerel compared to VP and CP samples. Moreover, VP and CP samples showed higher degree of textural deterioration compared to GC samples. Microbiologically, the shelf life of chilled gutted Indian mackerel was estimated to be 7-8, 17 and 19-20 days for CP, GC and VP samples, respectively. The sensory analysis scores confirmed the efficacy of gum coating in retarding the spoilage process during chilled storage. The current study identifies the potential of edible coating with gum arabic to improve the overall quality of Indian mackerel and extend its storage life during chilled storage.

No abstract

Natural gums, which have a polysaccharide backbone, are widely used in the food processing industry as binders, thickeners and texturizing agents. Although all are hydrocolloids and physico-chemical properties of various gums have been described by various workers, there appears to be lack of detailed studies on their functional properties, which show appreciable differences. The present study was carried out to determine the key functional characteristics of commercially important natural gums. These included flow, solubility, water holding capacity and oil holding capacity, angle of repose, bulk and true density, and coefficient of friction. The bulk density of various gums ranged from 0.95-1.20 g/mL, the lowest densities was that of Babool gum and the highest was of Piyar gum. The compressibility index of various gums ranged from 1 to 38.75%. Khair gum showed the highest solubility (83.65%) and Karaya gum showed the lowest solubility (60.06%). Psyllium gum showed the highest water holding capacity whereas gum Acacia showed the lowest value. Oil holding capacity of different gums varied from 114.66 to 214.66 (g oil/100 g gum). Ghatti and Piyar gums (38.13°) showed comparative decrease in angle of repose, whereas Guar gum showed an angle of repose of 39.80°.

The present work was aimed to investigate the possibility of incorporating vegetable gums as binders in nuggets prepared from freshwater catfish, Pangasius pangasius. Guar gum and gum Acacia, which are well-known texturising agents were added in varying quantities during the preparation of the nuggets. Proximate analysis indicated that moisture content decreased from 78.9 to 74.0%, with increasing concentration of gum (0 -2%), and so did fat content, from 6.1 to 5.4%. Protein content went up from 15.5% in control to 19.3% in treated sample. Control sample underwent maximum cooking loss (3.5%), whereas both treatments T4 (2% guar gum, w/w) and T7 (2% gum Acacia, w/w), exhibited minimum loss ( 2.7%). CIE L*a*b* values indicated significant lightening of the product during prolonged storage at 0 0 C). Textural and sensory evaluation data also indicated that vegetable gums could be incorporated successfully in fish nuggets to improve their texture and sensory attributes. In all the treated and stored samples (0 0 C, 60 days), the presence of bacteria, yeast and mould were well within permissible limits ( 3.0 x 10 2 cfu/g and  2.8 x 10 1 cfu/g, respectively).