Thiamin and riboflavin content of 15 varieties of rice processed in Guandong province in 3 different milling degrees (unpolished, standard and top grade) were estimated fluorospectrophotometrically. The thiamin content was averaged 0.48?0.01mg/100g for unpolished rice,0.33?0.07mg/100g for standard second grade and 0.16?0.04 mg/100g for top grade rice. The riboflivin content was averaged 0.09 ?0.02mg/100g for unpolished, 0.07?0.01mg/100g for standard second grade and 0.05 ?0.01mg/100g for top grade rice. Rice from Cing Er Ai, Min Ke Zhati, Qi Gui Zhao, Za You, and Zhong Gui rich in thiamin and the mixed third class rice from Shangshui county was rich in riboflaflavin. Rice from both Zhong Gui and Qi Gui Zhao was rich in thiamin and riboflivin. The thiamin and riboflavin content in rice depended on the rice variety and the area where rice was grown. The thiamin content in rice from Nan Hai County was higher than that from Shangshui and Guao Yiao Counties.Certain amount of thiamin and riboflavin was lost in the same kind of rice with diffeererit millig degrees. As compared with unpolished rice, the standard second grade rice lost about 30.63% of thiamin, 22.36% of riboflavin and the top grade rice lost 65.35% and 45.00% respectively.There was some thiamin and riboflavin loss during different storage periods, 4.85% of thiamin, 4.23% of riboflavin were lost after 6 months storage, and 10.3% of thiamin, 7.04% of riboflavin lost after one year storage.In order to improve the nutrition status of the people, it is necessary to advocate people to consume fresh and standard grade rice and to encourage cultivators to grow crops rich in nutrients.

0.05). The average loss of blood for all groups was 55.0?44.2 ml and of iron 21.4? 15.9 mg, equal to 0.7 mg iron loss daily.

Objective: Our study described the body composition of 50 preschool children aged from 4 to 6 years old and evaluated their nutritional and developing status. Methods: Body composition was measured with dual energy X ray absorptiometry(DXA). Results: BMC, BMD, FTM, %BF, LTM of all children were (463.3?80.9)g、(0.69?0.04)g/cm 2、(3917.1?1281.6)g、(21.8?4.9)、(13391.4? 1823.8 )g respectively. The relationships between BMC and age and between LTM and age were positively correlated. BMD and LTM of the boys were significantly higher than those of the girls. On the contrary, FTM, %BF, F t/l and F t/a of the girls were obviously greater than those of the boys. Conclusion: DXA method may be used to evaluate the nutritional and developing status in preschool childran.