비방사구와 방사구 달걀 난황을 가열 압착하여 얻은 난황유를 정제한 후 화학적 성질과 지질조성에 관하여 실험한 결과는 다음과 같다. 난황의 일반성분은 비방사구, 방사구가 각각 수분이 49.50%, 47.06%, 조단백질은 16.53%, 16.98%, 조지방은 31.05%, 33.34%로 주성분을 이루었고, 조지방, 조단백의 함량은 방사구가 비방사구 보다 더 높았다. 난황유의 화학적 성질은 비방사구, 방사구가 각각 산가 8.95, 9.85, 요오드가 57.64, 58.15, 비누가 240.14, 223.92로 나타났다. 난황유 총지질의 조성은 비방사구, 방사구 각각 중성지질 76.60%, 71.23%, 당지질 3.95%, 5.03%, 인지질 19.45%, 23.74%였다. 중성지질 중에는 비방사구, 방사구 각각 triglycride가 59.3%, 56.3%로 주성분을 이루었고 그 외에 monoglyceride와 diglyceride의 함량이 높았다. 당지질은 비방사구, 방사구 각각 digalactosyl diglyceride가 98.3%, 97.8%로 대부분을 차지하였다. 인지질은 방사구, 비방사구 각각 phosphatidyl choline＋choline＋phosphatidyl serine이 58.6%, 59.8%로 주성분을 이루었고, 그 외에 lecithin＋sphingomyelin과 미확인 성분이 존재하였다.

Egg yolk oil was obtained from a roasting and pressure egg yolks obtained from cage system, open barn system, respectively. Lipids in egg yolk oil were extracted with a mixture of chroform: methanol (2:1, v/v) and fractionated into neutral lipid, glycolipid and phospholipid by silicic aicd column chromatography. Lipid components of each fraction were determined by thin layer chromatography (TLC). The results were summarized as follows: lipid content of egg yolk from each cage system (A) and open barn system (B) was 31.05% and 33.34%, and the lipid is made up of neutral lipid 76.60%, 71.23%, glycolipid 3.95%, 5.03% and phospholipids 19.45%, 23.74% respectively. Triglycerides (A: 59.3%, B: 56.3%) were the major components among the neutral lipids; monoglycerides, diglycerides, free sterols, and free fatty acids were the minor copmonents. The major components of the glycolipids were digalactosyl diglycerides (A: 98.3%, B: 97.8%), the other components were cerebrosides. The major components of the phophoslipids were phosphatidyl choline plus phosphatidyl serine (A: 58.6%, B: 59.8%) the other components were lecithin plus sphingomyelin.