Oxidative stress is believed to play an important role in the development of vascular complications associated with diabetes mellitus. We examined the antioxidative effect of sesamin and sesamolin on the preventing the development of insulin dependent diabetes mellitus using streptozotocin-induced Sprague Dawley diabetic rats. From 48 hours after injection of streptozotocin (60 mg/kg body weight), a portion of diabetic rats were fed with 0.2% sesamin and sesamolin containing diet for 3 weeks. There were significant differences of blood glucose and kidney weight between diabetic ports and control. Sesamin and sesamolin increased glutathione-S-transferase activity in kidney. The concentration of the thiobarbituric acid-reactive substances in the serum, liver, and kidney of diabetic rats administered sesamin and sesamolin decreased significantly as compared with that of the non-treated diabetic group. Dietary sesamin and sesamolin suppressed the oxidative stress in the diabetic rats. These results demonstrated that sesamin and sesamolin are potential and effective antioxidants that can protect the complications associated with diabetes.

To obtain some information on the change of antioxidant components of seeds during grain filling stage as affected by the sowing dates, lignan compounds were investigated according to days of flowering under different sowing dates. Sesamin and sesamolin contents showed significantly different by days of flowering and varieties. Both of sesamin and sesamolin content increased after flowering and reached highest at 40 days of flowering, but they started to decrease thereafter. Sesamin and sesamolin contents of sesame seeds changed with sowing dates. Generally, late sowing date of May 30 showed relatively higher accumulation rate of sesamin and sesamolin contents rather than other sowing dates, but overall patterns were a little different by varieties and lignan compounds. In case of variety Yangbaek, sesamin and sesamolin contents showed relatively higher at sowing date of May 30, but variety Yanghuck showed higher sesamin and sesamolin contents till 20 days of flowering when sowing date of May 30, but it showed to change that both lignan contents were relatively higher under sowing date of May 10.

Sesamin and sesamolin, antioxidant lipidsoluble lignan compounds, are abundant in sesame (Sesamum indicum L.) seed oil and provide oxidative stability of oil related to sesame quality. The sesamin and sesamolin contents of 403 sesame land races of Korea were determined by HPLC analysis of methanol extract (HPLC value), and their total lignan content was compared with those by using UV-Vis spectrophotometric analysis (UV method) of methanol (UV-MeOH value) and hexane (UV-Hexane value) extracts. HPLC values of total lignan content were strongly associated with UV-Hexane (r=0.705**) and UV-MeOH (r=0.811**) values. The UV values from both the extracts were 3.8-4.7 times higher than those of HPLC values. Lignan content was overestimated by UV method because total compounds in the mixture solution were quantified by absorbing at the same ultraviolet wavelength as in HPLC method. UV method could more rapidly analyze small amount of sample with higher sensitivity of detection than HPLC method. Average contents of lignans in sesame germplasm evaluated in this study were 2.09~pm1.02mg/g of sesamin, and 1.65~pm0.61mg/g of sesamolin, respectively, showing significant variation for lignan components. The results showed that UV method for the determination of sesamin and sesamolin could be practically used as a faster and easier method than HPLC by using the regression equations developed in this study

To obtain some information on the change of antioxidant components of seeds during grain filling stage as affected by the sowing dates, lignan compounds were investigated according to days of flowering under different sowing dates. Sesamin and sesamolin contents showed significantly different by days of flowering and varieties. Both of sesamin and sesamolin content increased after flowering and reached highest at 40 days of flowering, but they started to decrease thereafter, Sesamin and sesamolin contents of sesame seeds changed with sowing dates. Generally, late sowing date of May 30 showed relatively higher accumulation rate of sesamin and sesamolin contents rather than other sowing dates, but overall patterns were a little different by varieties and lignan compounds. In Yangbaekkae, sesamin and sesamolin contents showed relatively higher at sowing date of May 30, but Yanghuckkae showed higher sesamin and sesamolin contents till 20 days of flowering when sowing date of May 30, but it showed to change that both lignan contents were relatively higher under sowing date of May 10.

본 시험는 국내의 리그난 고함유 품종 개발이 미흡한 실정에서, 기존에 개발된 참깨 품종을 대상으로 항산화 성분인 리그난 화합물 및 지방산 조성 등의 품질을 분석 비교함으로써 리그난 고함유 품종 개발과 리그난 화합물의 건강기능식품으로의 소재 개발에 유용하게 이용될 수 있는 품질 기초 자료를 제시하고자 실시하였으며 그 결과를 요약하면 다음과 같다. 1. 2002년, 2003년에 재배된 참깨 각각 21품종, 27품종을 대상으로, 2002년도의 세사민, 세사몰린의 평균함량은 각각 4.08±1.742.48±0.68mg/g 이었으며, 2003년도의 세사민, 세사몰린의 평균함량은 각각 4.08±1.512.48±0.67mg/g 이었다. 2. 흰깨, 검은깨의 2003년의 세사민 평균함량은 4.87±0.731.82±0.47mg/g , 세사몰린 함량은 2.85±0.251.42±0.31mg/g 으로 세사민, 세사몰린 모두 흰깨가 검은깨보다 함량이 2~~4 배정도 높았다. 3. 성분깨는 세사민, 세사몰린 함량이 2002년에는 각각 5.94, 3.26mg/g이었고, 2003년에는 각각 6.27, 3.21mg/g으로 모두 상위 1~~2 위 순위에 분포하는 양상이었으나, 다른 흰깨 품종들은 재배 연수에 따라 절대함량은 물론 함량 순위에도 약간의 변이를 보였다. 4. 세사민은 2002년에는 단백깨(6.22mg/g), 성분깨(5.94mg/g), 남다깨(5.83 mg/g), 남안깨(5.59 mg/g) 순으로 함량 순위를 나타내었고, 2003년에는 성분깨(6.27 mg/g), 다삭깨(5.53mg/g), 단백깨(5.50mg/g), 진백깨(5.45 mg/g), 서둔깨(5.41mg/g) 순으로 함량 순위를 나타내었다. 5. 세사몰린은 2002년에는 황백깨(3.27mg/g), 성분깨(3.26mg/g), 안남깨(3.22 mg/g), 한섬깨(3.17 mg/g), 단백깨(3.16mg/g)순으로, 2003년에는 성분깨(3.21 mg/g), 서둔깨(3.04 mg/g), 풍안깨(3.10 mg/g), 남안깨(3.09 mg/g), 단백깨(3.04 mg/g) 순으로 함량 순위를 나타내었다. 6. 세사민 함량이 높은 단백깨, 성분깨, 다삭깨, 남다깨, 풍안깨 등은 성분깨가 48.56~% 로서 기름함량이 다소 낮았으나 나머지는 50.00~% 이상으로 양호한 기름 함량분포를 나타내었다.

본 연구는 고항산화 양질 육종의 체계확립을 위해서 참깨에 있는 특수성분인 sesamin, sesamolin의 표준물질을 동정하고 그 분석기술을 개발하였는바 그 결과는 다음과 같다. 1. 한국산 참깨로부터 sesamin, sesamolin 성분을 분리하여 화학적 구조를 분광학적 방법(UV, 1 H와 13C-NMR, MS)으로 확인하여 sesamin, sesamolin의 표준물질을 동정하였다. 2. 참깨 lignan성분의 추출 및 분리에는 Unsaponifiable fration 보다 MeOH 냉온처리가 더 효과적이었다. 3. 검량선의 회귀직선의 방정식은 sesamin에서 y=53924.43＋1277.93x(r=0.9993)이었고 sesamolin의 경우는 y=11034.95＋1188.38x(r=0.9994)로 추정되었다. 4. 한국산 참깨의 lignan 성분함량은 단백깨의 경우 sesamin 0.42% sesamolin 0.3%로 나타났다.