♣속시렛 추출(Soxhlet Extraction)
:고체, 반고체 시료로부터 반휘발성 물질을 유기용매로 추출하는 방법.
■원리: 용매 플라스크 위에 추출관, 그 위에 환류 냉각기가 연결된 장치이다. 추출관 속의 원통형 여과지 또는 여과관에 시료를 넣고 플라스크속에 있는 용매를 가열하면, 용매의 증기는 화살표처
I. Executive summary
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1. Introduction
1) Definition of preservation and food-spoilage micro-organisms
Food preservation is the process of treating and handling food to stop or greatly slow down spoilage (loss of quality, edibility or nutritive value) caused or accelerated by micro-organisms. Some methods, however, use benign bacteria, yeasts or fungi to add specific qualities and to preserve food (e.g., cheese, wine
2. 2. Extraction
After the fermentation, the microorganisms(Alcaligenes latus) are filled with PHB in their body. These PHBs have to be separated from microorganisms to make final product. To separate PHBs from biomass, they are extracted from biomass by using solvent. These PHB extracted solvent will experience washing and drying process. After that, PHB can be precipitated as white powder.
extraction) ; 원료가 액체인 경우
(예) 초산 수용액에 함유된 초산을 벤젠에 의해 추출
3-2. 추출 공정
추출의 원료를 추료라고 하며 고체 또는 액체 형태이다. 추료(feed)는 추제(extraction solvent)에 가용성이 있는 성분인 추질(solute)과 가용성이 없는 기타 성분(inert material)으로 구성된 혼합물이다. 추제(extrac