Variability of Thiamine Concentration in Thai rice

Monthani Phosaeng, Ketsaraporn Junprasert, Phakpoom Phraprasert

Abstract


The study of variation in thiamine content in Thai rice and the changes of thiaminlevels in developing grains were evaluated. The variation of total thiamine contents (free thiamine, thiamine monophosphate and thiamine pyrophosphate) in 30 cultivars of rice were between 0.144-0.447 mg/100 g. The variability of total thiamine among these cultivars was 0.303 mg/100g. This demonstrated that thiamine biosynthesis and accumulation were depended on genetic traits of each cultivar thus this showed the possibility to improve thiamine contents via breeding programme. In addition, the thiamine contents of rice grains at different stages of grain development were significantly difference which at flowering stage had the lowest of thiamine and then thiamine tended to clearly increase at milky stage and constant at dough stage and maturity stage demonstrated the highest of thiamine. Suphan Buri 1 was the highest synthesized and accumulated of thiamine from flowering stage to maturity stage (0.054 mg/seed). Therefor, the thiamine contents in grains were depended on rate of biosynthesis and accumulation during grain development.

 

Keywords:  thiamine, vitamin B1, grain development, rice

Abstract

The variation of thiamine content in Thai rice and changes in thiaminlevels in developing grains were accessed. Total thiamine content (free thiamine, thiamine monophosphate and thiamine pyrophosphate) in 30 cultivars of brown rice were significantly difference which RD41 had the highest of total thiamine and Phitsanulok2 had the lowest which were 0.447 and 0.144 mg/100g, respectively. These results showed a high variability of total thiamine, 0.303 mg/100g. In addition, the thiamine content of rice grains at different stages of grain development were significantly difference which at flowering stage had the lowest of thiamine and then thiamine tended to clearly increase at milky stage and constant at dough stage and maturity stage demonstrated the highest of thiamine. Suphan Buri 1 was the highest synthesized and accumulated of thiamine from flowering stage to maturity stage (0.054 mg/seed). 


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References


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