乳糖酸為經濟價值高的產品，用途廣泛，醫學工程、藥物工程、化妝品工程以及食品工程等皆能添加。全球目前約有30%的乳製品廢棄物，乳清，沒有被善加利用，長期大都以丟棄或是做為動物飼料處理。若可利用發酵程序將乳製品廢棄物生產附加價值高的產品，不但能兼具能源與環保雙重價值，以操作與成本考量，也相當具有競爭力。目前已發現可將乳清利用Pseudomonas taetrolens發酵產生附加價值高的乳糖酸。
先前的研究發現大部分菌種照射紅光可促進其氧化能力，而本實驗利用此特性，將具有光源接受器的Pseudomonas taetrolens照射紅光以及藍光，探討其對生產乳糖酸的影響。目前由搖瓶實驗數據可知，照射500 lux紅光可促進Pseudomonas taetrolens發酵乳清生產乳糖酸，乳糖酸產量與不照光對照組相比，18.5 g/L由提升到23.8 g/L，另一方面照射100 lux藍光則是在菌種生長階段能促進菌種的生長，發酵第12小時菌種與不照光對照組相比，3.78 g/L由提升到5.61 g/L。因此，利用此特性進行兩階段方式發酵，發酵前24小時照射100 lux藍光促進菌體生長，隨後照射500 lux紅光促進菌體氧化能力，實驗結果發現，兩階段式照射能縮短發酵時間，增加發酵效率。

Lactobionic acid(LBA) finds extensive applications in the fields of pharmaceuticals, cosmetics and medicine. Currently, about 30% of annual world cheese whey production remains underutilized, ending up as waste or being employed as animal feed. Therefore, the methodology of fermentation by using cheese whey as an inexpensive raw to generate high value-added product LBA demonstrates an environmental and economic objective. In the recent studies, they can promote the oxidation activity of bacteria by exposing to red light in the fermentation process. In additions, Pseudomonas contain the photoreceptors of red light and the modulated effect by blue light. In this study, we used the two-stage culture light bioreactor to enhance lactobionic acid production from whey by Pseudomonas taetrolens.
A light bioreactor with shake-flasks can promote the first 12 hours dry cell weight by exposing to 100lux blue light; in addition, exposing to 500lux red light can improve the production of LBA from 18.5g/L to 23. 8g/L. Therefore, in order to ferment in the best environment, it is suggested that exposing to 100 lux blue light during the growth phase, which is the first day in fermentation process, and then change to the 500 lux red light for the oxidative phase by the two-stage culture light bioreactor. The photobioreactor experiment shows that the two-stage culture can shorten the fermentation time.

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