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Analytical characterization of chemically modified starches by FT-Raman spectroscopy

100%

Phillips D. L., Xing J., Kong Chong C., Corke H.

Żywność Nauka Technologia Jakość. Suplement

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2000

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tom 07

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nr 2

We have recently developed an FT-Raman spectroscopic method for measuring the amount of chemical modification of starch samples from a diverse range of botanical sources and amylose contents. In this paper, we present results and FT-Raman spectroscopic calibration curves that can be used to measure the degree of chemical modification for starches that have been acetylated, succinylated, cationic modified, and maleic acid modified. The FT-Raman methodology we have developed is much faster than currently used wet chemistry techniques, is nondestructive of the sample, needs almost no sample preparation, does not require use of hazardous chemicals, and can be further developed for use as a quality control method for process control in manufacturing.

2

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Impact of cooking temperature on in vitro starch digestibility of rice varieties with different amylose contents

67%

Guillen S., Oria R., Salvador M. L.

Polish Journal of Food and Nutrition Sciences

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2018

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tom 68

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nr 4

The aim of this study was to evaluate the effect of cooking temperature on the in vitro starch digestibility of four varieties of rice: Basmati, Calrose, Arborio and Bomba. Total starch, resistant starch and amylose contents were determined in raw and cooked samples. The in vitro kinetics of starch hydrolysis were also determined, and the hydrolysis and glycemic indexes were estimated. Both the initial amylose content and the cooking temperature had a signifi cant Influence on the resistant starch content. Rice cooked at 95ºC retained a higher resistant starch content than rice cooked at 100ºC. The in vitro study of starch hydrolysis showed that hydrolysis tended to be slower and less complete for rice with a higher amylose content and for rice cooked at a lower temperature. Cooking rice at 95ºC instead of 100ºC reduced the estimated glycemic index by approximately 10% for the varieties tested.

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Study on physical-chemical characters and heritability for yield components in rice (Oryza sativa L.)

67%

Ha P. T. T., Khang D. T., Tuyen P. T., Minh T. N., Xuan T. D., Lang N. T., Buu B. C.

International Letters of Natural Sciences

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2016

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tom 57

Present study was performed to analysis both physical and chemical properties of rice germplasm and heritability for yield components in combinations. A total of 44 lines/varieties obtained from Cuu Long Rice Research Institute genebank, and 30 F1 generation combinations were evaluated. The results showed that the rice line IR79008-B-11-B-B-1 showed overall good physical characters (head rice, grain length, grain width, chalkiness). In terms of chemical characteristics, three varieties IR75499-73-1-B, OM6162, and OM4900 were found to have good amylose content, gel consistency, protein content, gelatinization temperature, and aroma. A very notable finding was that the cross between OM6162/SwarnaSub1 that low amylose content (20.2%), high gel consistency (78.2 mm), high protein content (8.1%), appropriate gelatinization temperature (scale 5), low chalkiness (level 0), high heritability (0.9) for grain yield trait/cluster, and (0.84) for the number of panicles/cluster. Moreover these characters consist of plant height, panicle length, number of panicles/cluster, number of filled grains/panicle, number of unfilled/panicle, and grain yield/ cluster showed moderate to high heritability of mean for combination OM6162/SwarnaSub1. The results suggest that the grain yield trait/cluster and the number of panicles/cluster are important yield contributing traits to rice breeders for selecting ideal combinations for higher yield and quality of next generations.

4

Starches from wheat of various technological value

67%

Nowotna A., Gambus H., Ziobro R., Berski W., Lewandowicz G., Sabat R., Cygankiewicz A.

Żywność Nauka Technologia Jakość. Suplement

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2000

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tom 07

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nr 2

The research was carried out on the grain of wheat classified to different quality classes (A, В or C) grown in 1998-1999. Protein content, wet gluten were measured, and bread was baked from flour. When starch was extracted from the flour, the following analyses were performed: amylose and phosphorus content, and its swelling and pasting characteristics. It was stated that investigated starches from the varieties of wheat belonging to different classes greatly vary in their properties. It was stated with full confidence that a high pasting temperature and medium water binding capacity and solubility are favourable for baked bread volume.

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Właściwości skrobi ziemniaczanej rozsortowanej z zastosowaniem sit

51%

Tomaszewska-Ciosk E., Golachowski A., Drozdz W., Boruczkowska H., Boruczkowski T., Zdybel E.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2010

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tom 557

Materiał badawczy stanowiła skrobia ziemniaczana (o wielkości gałeczek 5,0-112,2 µm), którą rozdzielono przy użyciu sit Retsch’a o wielkości otworów: 45 µm, 32 µm, 20 µm na 4 frakcje. W skrobi nierozsortowanej o raz w 4 uzyskanych frakcjach oznaczono: średnią średnicę wielkości gałeczek, udział frakcji amylozy i amylopektyny, zawartości pierwiastków żelaza, magnezu, wapnia, potasu i fosforu), wodochlonność i rozpuszczalność w wodzie w temperaturze 80°C, stopień scukrzenia uzyskany w wyniku działania α-amylazy i glukoamylazy oraz stopień retrogradacji 1% kleików. Wszystkie uzyskane frakcje charakteryzowały się znaczną jednorodnością wielkości gałeczek skrobiowych. Frakcje zawierające gałeczki duże odznaczały się większą zawartością amylozy w porównaniu do frakcji zawierających gałeczki małe. Zawartość fosforu, żelaza, magnezu, wapnia i potasu malała wraz ze wzrostem wielkości gałeczek. Wodochlonność i rozpuszczalność skrobi rosła wraz ze wzrostem wielkości gałeczek. Kleiki sporządzone z gałeczek dużych były w mniejszym stopniu hydrolizowane przez α-amylazę niż kleiki przygotowane z gałeczek małych. W najmniejszym stopniu zjawisku retrogradacji ulegały kleiki przygotowane z frakcji gałeczek małych, a w największym kleiki przygotowane ze skrobi o największych gałeczkach.

Ograniczanie wyników

Analytical characterization of chemically modified starches by FT-Raman spectroscopy

Impact of cooking temperature on in vitro starch digestibility of rice varieties with different amylose contents

Study on physical-chemical characters and heritability for yield components in rice (Oryza sativa L.)

Starches from wheat of various technological value

Właściwości skrobi ziemniaczanej rozsortowanej z zastosowaniem sit