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Commercial bean products were studied in terms of chemical composition and starch digestibility. In general, commercial cooked flours did not show differences in protein and ash contents. Canned beans also did not show statistical differences (α=0.05) in protein, but they were different in ash, perhaps due to botanical variety. Lipid content varied in the different flours, due to the formulation u
The retrograded resistant starch contents (RS-III) and syneresis indices of cold stored starch gels were compared. Isolated starches from three cereals (maize, sorghum and rice), two legumes (jack bean and lentil) and arracacha roots (Arracacia xanthorrhiza) were hydrated and gelatinized by boiling. Drained gels were stored for 24 h at 4°C before the analyses. Neither apparent amylose contents nor
Starch was isolated from Peruvian carrot (PC) -or arracacha- (Arraccacia xanthorrhiza B.) roots. Its chemical, physical, physicochemical and granular structural properties were compared to those of commercial cassava starch. Scanning electron microscopy revealed a granular size for PC starch ranging between 4 and 26 μm in diameter, with spherical and truncated-egg shapes. PC and cassava starches w
Starch is an important ingredient of many processed foods. The natural versatility of this polymer has been greatly expanded through physical and chemical modification processes, leading to new food applications. However, the alteration of starch functional properties may also affect its digestibility features, promoting changes that range from increased digestion rate to reduced overall enzymic a
The starch content of black beans and cowpeas was assessed enzymatically in freshly cooked as well as in cooked, stored, and reheated samples. The available starch contents of the variously treated seeds were greater in cowpeas (32-33%, dmb) than in black beans (25-28%, dmb). All samples exhibited relatively high levels of retrograded resistant starch (RS) (8-20%, total starch basis), although bea
Starch was isolated from either raw or steam-heated black, red, and lima beans. Isolates from steam-heated legumes were rich in indigestible (resistant) starch (19-31%, dmb), a fact not observed when raw seeds were used. Similarly, resistant starch measured directly in conventionally and high-pressure steamed beans was 3-5 times higher than in the raw pulses, suggesting retrogradation as the major
Despite their important contribution to seed weight, carbohydrates in pulses have received limited attention. However, experimental evidence accumulated during the last two decades indicate that legumes are rich sources of slowly digestible starch promoting moderate postprandial glycernic and insulinemic responses. Although the reasons for this phenomenon are not completely understood, some intrin
Legume seeds were treated in various ways, e.g. cooking applied either before or after milling, in order to obtain flours with different microstructural properties. In vitro protein digestibility was assessed by a pepsin/pancreatin index. In all cases digestibility was enhanced by cooking, although final values varied depending on the flour preparation procedure. Cooked and milled seeds, which ret
Carbohydrate foods differ considerably in their effects on postprandial glucose and insulin responses. Qualitative differences among starchy foods are particularly intriguing because of the dominance of starch in human diets. This paper focuses on food properties in cereal (eg, pasta, bread, Arepas, and porridge) and legume products (eg, red kidney beans and lentils) that affect metabolic response
A new method for measuring the rate of in-vitro starch digestion in products with a structure 'as eaten' is introduced. An equivalent amount of potentially available starch from each product was chewed by subjects, expectorated into a beaker and incubated with pepsin. The incubate was thereafter transferred to a dialysis tubing and incubated with pancreatic α-amylase for 3 h. Samples were removed
The digestibility of starch in precooked flours from green coat lentils (Lens culinaris Medik) and red kidney beans (Phaseolus vulgaris L.) was investigated by balance experiments using rats treated with antibiotics to suppress hind-gut fermentation. The legume preparations were rich in intact cells filled with denaturated starch and contained retrograded amylose. Between 8% (beans) and 11% (lenti
BACKGROUND: International middle- and long-distance running competitions attract millions of spectators in association with city races, world championships, and Olympic Games. It is therefore a major concern that ill health and pain, as a result of sports overuse, lead to numerous hours of lost training and decreased performance in competitive runners. Despite its potential for sustenance of perfo
Postprandial glycemic and insulinemic responses to variously processed red kidney beans were evaluated in normal subjects. The dried seeds were (a) boiled; (b) autoclaved; (c) boiled, freeze-dried, and milled to obtain a precooked flour (PCF) rich in cell-enclosed starch; or (d) milled, steam-cooked, and freezedried to yield a flour containing free starch (FSF). All bean products elicited lower me
The digestibility of a mixture of starches was evaluated in balance experiments, with both normal and streptozotocin-induced diabetic rats treated with antibiotics to prevent colonic fermentation of unabsorbed material. Pancreatic amylase production in the diabetic animals was only 10% of the normal level. In spite of this, only a minor decrease in the total starch digestibility index was recorded
Measured with an enzymic method, the starch content of a raw red kidney bean (Phaseolus vulgaris) flour (RBF) was higher than that of a cooked and blended (CBB) and of a cooked, freeze-dried, and milled (CBF) preparation of the seeds. Wet homogenization as well as pepsin pretreatment of CBF increased the starch yield, indicating that starch in the cooked samples is not completely available to enzy
Dried lentils (Lens culinaris) and beans (Phaseolus vulgaris, black, brown, white, and red) were boiled until soft, freeze-dried, and milled. This procedure yielded precooked flours (PCF), rich in intact cells filled with starch granules. Starch content in the various bean PCFs was underestimated by enzymic assays. Potentially available starch in PCFs was evaluated after complete release of starch
