Chemical Quality Evaluation of Commercial Infant Formulas

시판 조제 분유의 화학적 품질 평가

In this study, three domestic and one foreign formulas for the infants up to 5 month old were examined to detect chemical changes such as pH, reactive sulfhydryl groups(RSH) content, 5-hydroxymethylfurfral(HMF) content, available lysine content, electrophoresis, and surface color caused by heat treatment for long term storage. In the SDS-polyacrylamide gel electrophoresis, A and B products showed similar pattern, while C product had a clearly distinguishable $\beta$-lacto-globulin band, but in casein, only D product showed a few strong casein band. RSH content, which indicate the extent of whey protein denaturation, ranged from 4.40 to 5.93 mmole/g protein. HMF content. which indicate the extent of Maillard reaction, ranged from 192 to 432 $\mu$mole/100g in formulas. B product showed the highest RSH and HMF content. Available lysine content ranged from 31 to 46 mg/g protein. Among them D product contain the highest available lysine content and others showed no significant difference. In conclusion, the domestic infant formulas showed higher RSH and HMF content than the foreign product and the available lysine content of the domestic products were lower than of the foreign product.