ACTA ALIMENTARIA VOL. 21 (An International Journal of Food Science, 1992)

1992 / 3-4. sz. - EL-KADY, A. A.-EL-HISSEWY, A. A.-SIMON-SARKADI, L.: A correlation study between protein content and some physical traits of rice grain with the amino acids composition

279 EL-KADY el al.: PROTEIN IN RICE GRAIN 2.2. Means of the essential, non-essential amino acids composition and protein content of some Egyptian rice varieties Table 2 presents the means of the essential and non-essential amino acids composition of the Egyptian rice varities in 1989 and 1990 seasons. It is clear that the values of the essential amino acids increased in 1990 in comparison to 1989 for all the varieties. Moreover, the rice variety Giza 171 (Japonica) had the highest values of these amino acids, while the lowest values were determined in IR 28 and IR 19743-46 (Indica) varieties. Regarding the non-essential amino acids, the results showed that the mean values differed in the two seasons of study. The highest values were determined in Giza 171 variety in both seasons for most of these components. These results were in agreement with EL-KADY and co-workers (1991). Protein content was determined in the varieties and shown in Table 2. The data showed that protein content increased in the second season 1990 in most of the varieties. In 1989 it ranged between 6.28% and 8.70% for Giza 171 and IR 19743-46, respectively, while in 1990 it varied from 7.0% (for Giza 172) to 10.1% (for IR 19743-46). In general the highest values were determined for the Indica group and the Indica/Japonica variety (Giza 175). Same results were reported by EL-KADY and co-workers (1991). 2.3. Correlation coefficients between protein content and some physical traits of rice grain with the essential and non-essential amino acids composition It is shown in Table 3 that protein content was positively correlated with grain length and negatively correlated with grain width and 100 grain weight. The observed negative correlation of protein content and 100 grain weight were in harmony with the information reported earlier concerning the disproportionate quantity of protein located in the outer layers and in the embryo of rice grain. These results were in agreement with those reported by MOHANTY and REDDY (1972), HLLLERJSLAMBERS and co-workers (1973), VILA WAN and SLDDLQ (1973) and HsiEH and Kuo (1982). On the other hand, no significant coefficients were estimated between protein content and the essential amino acids composition. Despite there were high magnitudes of such estimate with some of the essential amino acids (0.463-0.457 and -0.342 for tryptophan, lysine and leucine, respectively), these values were not significant, same results were obtained by VILLAREAL and JULIANO (1978). While, significant correlation coefficients between protein content and some amino acids composition were found by CAGAMPANG and co-workers (1966) and EPPENDORFER and co­workers (1983). Acta Alimentaria 21, 1992

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