Silkworms have been developed for food and medicinal purposes, and several silkworm products are commercially available. However, there has been no research on their shelf stability. This study investigated the shelf stability of freeze-dried silkworms during storage at various temperature and humidity conditions, using three lipid oxidation indicators: peroxide, acid, and TBA value. The higher the temperature and relative humidity are, the more significant the three lipid oxidation indicators increase. Among these indicators, the TBA and peroxide values show the highest temperature dependence and humidity dependence, respectively. This study could contribute to the standardization of the shelf life of products made from freeze-dried silkworms.

In order to investigate the optimal UVB (ultraviolet B) treatment conditions for vitamin D2 enhancement of freeze-dried ear mushroom, sample size (below 300 μm~whole), UV treatment temperature (30~60℃), treatment density (6.25~50.0 mg/cm2) and the samples mixing frequency (1~32 times) were treated differently. After that, chromaticity, vitamin D2 and ergosterol (vitamin D2 precursor) contents were investigated. As a result of the investigating, effective UVB treatment conditions for vitamin D2 enhancement are as follows. The sample sizes were 2~4 mm and finely crushed pieces. The treatment temperatures were 50℃ and 60℃. The treatment density was 12.5 to 25.0 mg/cm2, and the number of sample mixing was 8 times or more. As the amount of vitamin D2 increased by UVB treatment, the ergosterol content generally tended to decrease. However, under some UVB treatment conditions, the vitamin D2 content was not high despite the decrease of ergosterol content. Under the conditions set in this experiment, it was possible to obtain ear mushrooms with enhanced vitamin D2 up to 26,968.7 μg/100 g. Therefore, it is thought that the ear mushroom is highly likely to be used as a vitamin D source and nutritionally fortified food ingredient.

In this study, the authors investigated the quality characteristics of convenient rice porridge made from powder (PR) and half-rice (HR) sized freeze-dried cooked rice using Samgwang and Jinsumi rice. The hydration properties of the freeze-dried cooked rice and the color, viscosity, spreadability, and sensory evaluation of porridge were measured. PR showed significantly higher water-binding capacity, solubility, and swelling power than HR for both varieties (p<0.05). As a result of the quality characteristic of the porridge, PR showed significantly higher lightness, redness, yellowness, viscosity, and spreadability than HR (p<0.05). Acceptance testing showed that HR had significantly better results for all acceptance attributes than PR (p<0.05). Jinsumi HR showed better consumer acceptance for taste, texture, and overall acceptability than Samgwang HR (p<0.05). Intensity evaluations of sensory properties revealed that the Samgwang PR was more spreadable but was less chewy than Samgwang HR. Furthermore, Jinsumi HR had higher transparency, greater spreadability, and a better cooked-rice odor and savory taste than Samgwang HR (p<0.05). These results confirm that convenient porridges can be produced using freezedried cooked rice.

The feasibility of infrared assisted freeze drying (IRAFD) was evaluated for shelf stable sea cucumber to improve the traditional drying methods such as freeze drying (FD), vacuum drying (VD) and hot air drying (AD, 60, 80, 100oC). Infrared (IR) radiant energy was provided to accelerate the drying rate of freeze drying (FD). IRAFD had the most rapid drying rate among IRAFD, FD and VD. IRAFD showed drying time of 13.7 h followed by VD (18.7 h) and FD (24.3 h). In the final moisture content of sea cucumber, it decreased down to 3.25% at IRAFD. However, FD and VD could not reduce down the moisture content of sea cucumber below 7%. Quality attributes of AD sea cucumber were not acceptable with very low restoration rate and excessive hardness. For example, AD 100 had very low weight restoration rate of 23% and hardness of 22 N. IRAFD showed quite high restoration rates (weight: 50%, width: 82%, length: 91%) and acceptable hardness of 3.1 N. IRAFD consumed the minimal electrical energy of 120 kJ as compared to 209 kJ of FD. This study showed the potential application of IRAFD to produce the shelf stable dried sea cucumber with microbial safety.

본 연구에서는 양봉산물로서의 가치 평가와 제품다양화를 위한 기초자료 제공을 위해 수벌번데기(16 ~ 20일령)의 영양성분분석 및 이를 이용한 추 출물을 제조하고 생리활성 효과를 검정하였다. 수벌번데기 동결건조 분말의 일반성분 분석 결과 수분 1.69 ± 0.07%, 조단백 48.52 ± 0.20%, 조지방 23.41 ± 0.14%, 조회분 4.05 ± 0.02% 였고, vitamin C 14.92 ± 0.52 mg/100 g, vitamin E 6.06 ± 0.11 mg α-TE/100 g 이었으며, 무기성분은 K과 P 의 함량(mg/100g)이 각각 1,349.13 ± 34.57 및 1,323.55 ± 43.85로 가장 높게 함유되어 있고, Ca과 Fe의 함량은 각각 55.43 ± 1.51 및 5.49 ± 0.19가 함유된 것으로 분석되었다. 수벌번데기 동결건조분말 중에 함유된 지방산은 포화지방산(g/100g total fatty acids)이 약 59.62, 불포화지방산이 약 40.38 을 차지하였고, 고급지방산인 palmitic acid (C16:0)가 35.49 ± 0.08, 그리고 oleic acid (C18:1, n-9)가 35.91 ± 0.22로 다량 함유되어 있었다. 구성아미노산(g/100 g)은 총 38.99 ± 2.63이 함유된 것으로 분석되었고, 유리아미노산(mg/100 g)은 총 5,129.04 였으며, 이중 proline이 1,257.68, glutamic acid가 759.12로 가장 높았다. 수벌번데기 추출물의 DPPH radical-scavenging 활성(μg/ml)은 증류수추출 시 0.8, 50% EtOH 추출 시 3.2, 70% EtOH 추출 시 6.4, 그리고 EtOH 추출 시 32 농도에서 약 90% 이상이었다. 이와 같은 결과는 항산화능에 기여하는 주요 화합물이 극성계 화합물임으로 추정되었으며, 저분자단백질 또는 유리형 아미노산일 가능성이 높은 것으로 추측되었다. 이상의 결과와 같이 수벌번데기는 우수한 식품원료로의 사용과 새로운 기능성 소재로의 활용을 기대할 수 있을 것으로 사료된다.

This study assessed the color, polyphenol content, and sensory characteristics of dressing containing varying concentrations (0, 3, 6 and 9%) of freeze-dried Natto. We determined that the absence of freeze-dried Natto (0%) imparted the highest additive value for both L and a, b. The polyphenol contents obtained were 0.63, 0.69, 0.74, and 0.82 mg/g for 0, 3, 6 and 9% of dressing containing freeze-dried Natto, respectively. The appearance, color, taste, texture, and overall preference of dressings with freeze-dried Natto showed significant differences between the samples. The overall preference was highest at 5.92 points, with dressing containing 9% Natto. The quality characteristics of the 9% added samples exhibited significantly higher values as compared to those of the controls, raising the possibility of development as a health-functional dressing.

This study evaluated the color, DPPH radical activity, and sensory characteristics of nutritional bars supplemented with varying concentrations (0, 2.5, 5, and 7.5%) of freeze-dried Natto. An inconsistent pattern was observed for the L value, whereas both a and b values increased significantly up to 5% addition of freeze-dried Natto. The DPPH free radical scavenging activity of nutritional bars supplemented with 0, 2.5, 5, and 7.5% freeze-dried Natto were determined to be 59.54, 59.70, 44.85, and 55.07%, respectively. The appearance, color, taste, texture, and overall preference of nutritional bars supplemented with freeze-dried Natto showed significant differences between the samples. The overall preference of the nutrient bar was highest at 6.08 points, determined for the 2.5% Natto supplemented bar. The quality characteristics of the 2.5% added samples exhibited significantly higher values as compared to the controls, thereby indicating the potential of development in health-functional cereal bars.

본 연구는 아이스플랜트의 기능성 소금 대체제로서의 가능성을 조사하고자 천연 및 정제소금과의 NaCl, Dpinitol, 총 페놀, 총 플라보노이드 및 DPPH 라디칼 소거능에 대한 기초자료를 비교 조사하였다. 아이스플랜트 동 결건조분말의 NaCl 함량을 분석한 결과 19%이었고 Dpinitol의 함량은 777 mg/100 g으로 천일염 및 정제염에 비해 NaCl 함량은 유의적으로 낮으나 D-pinitol을 함유하고 있어 건강기능성에는 도움이 될 것으로 사료된다. 또한, 아이스플랜트 동결건조분말의 총 페놀 및 플라보노이드 함량은 각각 115 mg/100 g 및 985 mg/100 g을 함유 하고 있어 DPPH라디칼 소거능의 항산화효과를 갖는 것으로 나타났다. 따라서 아이스플랜트 분말의 bioactive compound을 함유한 대체 소금 천연소재로서 가능성을 확인한 기초 연구를 제공하였다.

In this study, we aim to evaluate the phenoilcs profile of fresh freeze dried whole crop rice (FWCR) sample by HPLC–DAD analysis. Firstly, the fresh whole crop rice (before heading stage) was dried using liquid nitrogen and then powdered sample was extracted using methanol-water. The extract was quantified phenolics and flavonoids content by HPLC-DAD. HPLC-DAD analysis showed that the FWCR contained six phenolic acids including; caffeic, p-coumaric, ferulic, and chlorogenic acid, prophyl gallate in addition to five flavonoids; rutin, vitexin, luteolin, qurecetin and kaempferol. Results indicated that ferulic and p-coumaric acids were the major soluble phenolic acids in FWCR, and their concentrations were 3.1 and 2.65 mg/g DW. It can be summarized that the presence of phenolic and flavonoids in FWCR enhance the palatability and feed intake of ruminants.

This study was conducted to investigate the effects of a powder of steamed and freeze-dried mature silkworms (SMSP), Bombyx mori, on hair growth/loss in vivo in C3H mice. Topically applied SMSP for at least 10 days or longer showed potent hair growth promoting activity. SMSP-treated mice showed increase in hair weight significantly compared with control mice which were not treated with SMSP. Orally administered SMSP also showed hair growth promoting activity, which was lower than that when applied topically. In conclusion, SMSP was identified as a potential candidate for a novel hair-loss preventing and/or hair-growth promoting agent, which shortened the telogen phase to advance the following anagen phase in C3H mice in vivo when SMSP was applied topically for at least 10 days or longer.

This study examined the effects of drying methods of Aronia melanocarpa on contents of total polyphenols and flavonoids, antioxidant activity and anti-inflammatory activity. As a result, freeze-dried aronia extract (FDAE) significantly exhibited higher contents of total polyphenols and flavonoids (155.76 mg GAE/g and 105.70 mg QE/g) than hot-air dried aronia extract (HDAE) (134.93 mg GAE/g and 82.29 mg QE/g). Also, FDAE showed greater antioxidant activity than HDAE in both DPPH and ABTS. For anti-inflammatory activity, NO production from lipopolysaccharide activated RAW264.7 cell reduced at a dose-dependent manner in both FDAE and HDAE. However, reduction rate of NO production is higher in FDAE (62.7%) than in HDAE (33.5%). These results suggest that comparatively, freezedrying is a better method for preserving the antioxidant and anti-inflammatory activities and of aronia.

The objective of this study was to investigate the effects of freeze dried placenta supplementation on reproductive performance, colostrum and plasma biochemical composition in pregnant sows. Eleven Landrace × Large white sows were fed with corn-soybean meal diets supplemented with or without 1% freeze dried placenta powder from 10 days before their expected farrowing dates until 10 days postpartum. The colostrum protein content was significantly higher(P=0.043) in the treatment group than in the control group. Compared to the control group, the immunoglobulin G(IgG) concentration in the colostrum was significantly higher(P=0.004) in the treatment. In day 25 piglets plasma, the IgG concentration was higher(P=0.184) in the treatment than the control. The mortality rate was lower(P=0.102), and the piglet weight gain was higher(P=0.35) in the treated group. Overall, the treatment group showed greater levels of protein and IgG concentration in the colostrum, when compared to control group. Therefore, the freeze dried placenta supplementation on pregnant sows can enhance its colostrum composition, hence decrease the mortality and increase the growth rate of piglets.