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밤 Yogurt 의 제조와 특성 I. 밤 Yogurt 의 이화학적 및 미생물학적 성질
임종우,김상범,김기영,류진수 한국유가공기술과학회 2000 한국유가공기술과학회지 Vol.18 No.2
Physicochemical and microbiological properties of raw and dried chestnut yogurt manufactured by addition of raw and dried chestnut with levels of 1(T₁), 2(T₂), 3(T₃) and 4%(T₄) in skimmilk substrate were investigated during fermentation and storage period. Raw and dried chestnut yogurts were fermented with the mixed cultures of YC-380 and ABT-4, respectively. Titratable acidity and pH values of all treatments were increased and decreased significantly (p$lt;0.05) during fermentation period, respectively, and increased and decreased slightly during the storage period, respectively. Viscosity of raw and dried chestnut yogurt increased rapidly in order of T₄, T₃, T₂ and T₁ during fermentation period. The counts of viable cells of lactic acid bacteria in all treatments were rapidly and slightly increased during fermentation and storage periods, respectively. There were increased in order of all treatments fermented with YC-380 and ABT-4 in acid production and viscosity, while in order of ABT-A and YC-380 in counts of viable cells of lactic acid bacteria of all treatments. The counts of E. coli were not found in raw and dried chestnut yogurt for 12 days of storage after fermentation, respectively. As results the evaluation of physicochemical and microbiological properties of raw chestnut yogurt were better than those of dried chestnut yogurt and T₁ showed slightly high compared to those of control in all treatments. Based on the results of this experiment the optimum level of addition of raw and dried chestnut were 1%(w/v) for acid production, viscosity and the counts of viable cells of lactic acid bacteria.
김상범,김기영,임종우,신현수,류진수 한국유가공기술과학회 2001 Journal of Dairy Science and Biotechnology (JMSB) Vol.19 No.1
The effects of the addition of raw and dried chestnut with levels of 1%(T₁), 2%(T₂), 3%(T₃) and 4%(T₄) in skim milk substrate on the volatile flavour compounds and sensory properties of yoghurt fermented with the mixed cultures of YC-380 and ABT-4 during fermentation and storage period were investigated. In all treatments, the contents of acetaldehyde and acetone were detected at 2 hrs. and 1 hr. of fermentation, respectively and decreased with the storage period. The contents of ethanol and diacetyl were detected in all treatments at 3 hrs. and 4 hrs. of fermentation, respectively and increased significantly(p$lt;0.05) with the storage period. The contents of volatile flavour compounds of treatments were increased gradually with decreasing the level of addition of raw and dried chestnut, and increased in order of fermented with YC-380 and ABT-4. The contents of volatile flavour compounds of raw chestnut yoghurt were slightly high compared to those of dried chestnut yoghurt. The taste, flavour and texture of T₁, were slightly higher than those of all treatments immediately after fermentation and during the storage period. The scores of sensory evaluation of treatments except T₁, were lowered significantly(p$lt;0.05) with increasing the level of addition of raw and dried chestnut. The quality of both of flavour and texture, and taste were superior to chestnut yoghurt fermented with YC-380 and ABT-4, respectively. Generally the scores of sensory evaluation of dried chestnut yoghurt were slightly high compared to those of raw chestnut yoghurt. From the results mentioned above, the addition of raw and dried chestnut at 1%(w/v) level in skim milk substrate were suitable for volatile flavour compounds and sensory property of raw and dried chestnut yoghurt.