초록
인삼 유청음료를 렌넷유청, 인삼, 감미료, 꿀, 매실 등에 종류가 다른 유산균주들을 접종하여 제조한 후, 일부는 발효시키고 일부는 비발효 상태로 4$^{\circ}C$ 및 30$\pm$1$^{\circ}C$에 저장하여 이화학적 및 미생물학적 특성들을 조사하였다. 유청의 수율은 78.8%였고 저장기간 동안 pH는 감소하였으며 적정산도는 증가하였다. 인삼 유청음료의 고형성분, 회분, 지방질 함량은 각각 7.90~8.20%, 0.62~0.66%, 0.16%이었고 단백질 함량은 0.42~0.56%였으며 저장기간에 따라서 큰 변화가 없었다. 유당함량은 유산균 발효시킨 시료가 발효시키지 않은 시료보다 높았다. D(-)- 및 L(+)- 젖산함략은 저장 기간(1~5주)중에 유산균 발효 인삼 유청 음료(17.3~156.1 mg/100g, 347.3~1894.2mg/100g)는 비발효 인삼 유청음료(6.2~82.8mg/100g, 7.1~885.5mg/100g)보다 높았다. 유산균으로 발효시키지 않은 시료와 Lac. casei sub-sp. casei와 Str. salivarius sub-sp. thermophilus를 접종하여 발효시킨 시료의 총 saponin 함량은 저장기간이 경과함에 따라 증가하는 추세였으나 Lac. acidophilus와 Lac. delbrueckii sub-sp. bulgaricus를 접종한 시료는 감소하는 경향을 나타냈다. 인삼 유청음료의 전기영동 결과 모든 시료에서 $\alpha$-la과 $\beta$-lg이 뚜렷이 나타났으며 저장기간에 따라 변화가 거의 없었다. 저장기간(제 1, 3주)동안 대장균군은 검출되지 않았으며 총세균수와 저온성 세균군은 저장기간이 경과함에 따라 증가하였다.
Ginseng-whey beverages were prepared with rennet whey, ginseng, sweetener, honey and Japanese apricot, inoculated with different strains of lactic acid bacteria or unfermented partly. The samples were stored at 4$^{\circ}C$ or 30$\pm$1$0^{\circ}C$ and then physicochemical and microbiological properties were investigated. The yield of whey was 78.8%. The pH-values reduced and acidities increased during the storage period. The contents of solid-substances, ash and lipid in ginseng-whey beverages were 7.90~8.20%, 0.62~0.66% and 0.16%, respectively. The protein contents of ginseng-whey beverages were 0.42~0.56% and the contents were not changed during the storage period. The lactose contents of fermented beverages were higher than those of unfermented beverages. During the storage period (1~5 weeks), the ranges of D(-) - and L(+)- lactic acid contents in fermented ginseng-whey beverages (17.3~156.1 mg/100g, 347.3~1894.2mg/100g) were higher than those of unfermented ginseng-whey beverages (6.2~82.8mg/100g, 7.1~885.5mg/100g). The contents of total saponin in unfermented sample and fermented sample (Lac. casei sub-sp. casei+Str. salivarius sub-sp. thermophilus) were increased during the storage period. But, those of the fermented sample(Lac. acidophilus+Lac. delbrueckii sub-sp. bulgaricus) were reduced. In the electrophoretic results of ginseng-whey beverages, an $\alpha$-lactalbumin and a $\beta$-lactoglobulin bands were shown apparently and there were no changes observed during the storage period. During the storage period (1~3 week) the coliform was not detected and total plate counts and psychrotrophs were increased according to the storage period.