The effect of ripening temperature, pH and salinity on the formation of N-nitrosamine (NA) during Kimchi fermentation and in vitro was studied, respectively. During Kimchi fermentation for six weeks at cold storage temperature (4℃) and room temperature (16 ±2℃), the contents of nitrite and dimethylamine (DMA) showed variation at room temperature but no variation at cold storage temperature. The maximum generation of nitrosodimethylamine (NDMA) resulted low content (2.69 ug/kg) at cold storage temperature but started to increase after one week fermentation and reached to the 18-fold higher generation (49.6 ug/kg) at room temperature. During Kimchi fermentation, no correlation was observed between the variation of nitrite and DMA content and the generation of NDMA. However, pH showed effective relation to NDMA generation such as the highest NDMA generation was obtained at lowest pH 4. During in vitro test, higher temperature and lower pH resulted more NDMA generation and generation amount was affected more by pH. Also, the salinity of Kimchi provided inhibitory effects on the formation of NDMA. NDMA was produced 5.86 ug/kg at normal salinity (2.5%) but 90.9 ug/kg at lower salinity (15%) after three week. The higher salinity showed lower formation of NDMA in vitro test, too.

연시를 배추김치에 0, 5, 10, 15% 첨가하여 4℃에서 20일간 저장하면서 pH, 산도, 염도, 환원당, Vit.C 및 관능적 특성을 분석하였다. pH는 저장기간에 따라 점차 낮아지고 시료간에는 거의 차이가 없었다. 산도는 숙성초기 pH의 변화가 급격히 낮아질 때는 균일하고 숙성후기에 점차 증가하였으며 제조당일부터는 20일 동안 0.3∼1.0%를 나타내었다. 염도는 1.2∼2.2%로 숙성이 진행됨에 따라 점차적으로 감소하였으며 대조군이 전반적으로 염도가 높았다. 환원당은 저장 2일째 함량의 감소를 보였다. 발효진행에 따라 점차 감소하였고 연시 첨가군의 함량이 대조군보다 전반적으로 높았다. Vit. C는 저장 4일경 가장 높은 함량을 보였고, 이후 점차적으로 감소하였으며 연시 첨가군이 대조군보다 함량이 높았다. 관능검사 결과는 저장기간동안 맛, 향기, 텍스처 및 전반적인 바람직성에서 연시 10% 첨가군이 기호도가 가장 높게 나타났다. 따라서 김치에 연시를 첨가하면 김치가 숙성됨에 따라 연시가 김치의 기호성에 중요한 역할을 할 수 있는 것으로 볼 수 있다.

대두유를 튀김유로 사용하여 french fried potato를 185℃에서 제조하면서 84시간 튀김한 후 aluminium alloy (물, silicone, manganese, porous aluminium carrier을 함유)를 처리한 감자튀김유와 대조구의 물리화학적변화를 측정하였다. 물리화학적 변화의 척도로는 극성지질, 중합체의 함량, 공액이중산가 및 유리지방산가를 사용하였다. Aluminium alloy를 처리한 시료는 대조구에 비해 극성지질 및 중합체 형성을 크게 억제하였으며 공액이중산가 및 유리지방산가의 증가 억제에는 영향을 주지 않았으며 유리지방산가의 경우 오히려 촉진되는 결과를 보였다 따라서 튀김유에 대한 aluminium alloy의 처리는 유리지방산이나 공액이중산의 형성억제보다는 극성지질 및 중합체의 형성억제에 효과적임을 알 수 있었다.

Effectiveness of some natural antioxidants were investigated by measuring the physico-chemical charcteristics and fatty acid composition during thermal oxidation in palm oil. Tocopherol showed most enhanced thermal oxidation stabilities compared to the other natural antioxidants. AR spice was no good AOM stability and changes of acid value but the other parameters were obtained desirable results. The changes of linoleic aicd content was slightly decreased during thermal oxidation. Addition of rosemary and glycyrriza extract increased the stabilities of oil less than tocopherol and AR spice. Order of antioxdative effects was tocopherol, AR spice and others. There was no significiant difference in stability of rosemary and glycyrriza extract.

The storage stability of Instant Ramyon by industrially prepared with palm, beef tallow and blended rapeseed oils for frying oil was studied. The products was stored under fluorescent light at 60℃ with illumination of 9,000 lux. Changes of peroxide value, total carbonyl value, and absorbance at 232 nm of lipids extracted from Ramyon were investigated during storage. The storage stability of Ramyon prepared with oils containing TBHQ had better than that prepared with a mixture of BHA and BHT. The Ramyon prepared with 4 part of rapeseed oil to 6 part of tallow containing 0.02% BHA/BHT showed higher storage stability than that prepared with palm oil alone but showed lower stability than that prepared with tallow alone both under the same condition of antioxidant treatment.

A preliminary investigation was performed to evaluate the possibility of partially replacing palm oil and beef tallow by rapeseed oil for frying oils of instant Ramyon manufacturing. The AOM stability of rapeseed oil was inferior than of palm oil, but was comparable to that of beef tallow. When rapeseed oil was blended with palm oil or beef tallow, the AOM stability of the blended oil was improved. As far as AOM stability is concerned, best results were obtained with a blending ratio of 3 part of rapeseed oil to 7 part of palm oil and a ratio of 4 part of rapeseed oil to 6 part of beef tallow. These blended rapesee oils was retarded the formation of conjugated dienes and polymers during heating. The antioxidative effects on the stabilities of AOM and thermal in blended rapeseed oils showed that TBHQ was superior to tocopherols and a mixture of BHA and BHT was inferior.

가열우지중 콜레스테롤 산화안정성을 연구하기 위하여 130, 150 및 18 가열온도에서 일정시간 가열하였을 때 생성되는 각종 콜레스테롤 산화생성물을 TLC에 의하여 분리.확인하고, 지방산 조성의 변화를 측정하였다. 지방산 조성은 가열시간이 경과함에 따라 linoleic과 linolenic acid등의 불포화 지방산은 약간씩 감소한 반면 포화지방산의 함량은 다소 증가하는 경향이었고, 이러한 변화는 가열온도가 높을수록 심하였다. 추출한 비비누화물의

가열우지의 산화 안정성을 연구하기 위하여 우지를 130, 150 및 18의 세가지 튀김온도 조건에서 하루에 10시간씩 총 240시간 가열하였을 때 가열시간에 따라 지방질의 산화정도를 나타내는 각종 이화학적 특성치들(산값, 과산화물값, 요오드값, 유전상수, 극성화합물 및 중합물의 함량, 굴절률, 발연점 및 점도)과 색도의 변화를 연구하였다. 가열한 우지의 산값, 유전상수, 굴절률, 점도, 극성화합물 및 중합물의 함량은 가열시간의 경과에 따라 계속