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Carotenoid is a group of natural pigment which is very diverse in colors, ranging from yellow to red. It is an antioxidant, and is able to increase human immune system. Therefore, the reseach “Determination of carotenoid-producing bacteria isolated in Hon Tre, Kien Hai district, Kien Giang province” aim at isolating hingcarotenoid-producing bacteria to apply in food industry and especially husbandry and aquaculture. The results show that there are 17 carotenoidproducing bacterial strains which were isolated from 6 soil samples and 4 sea water samples collected in Hon Tre, Kien Hai district, Kien Giang province. The colony colors of bacterial strains are ranging from yellow to pink. Average diameters of colonies are approximately from 3 to 5 mm. In terms of morphology, all the bacterial
cells are rod-shaped with different size (2 - 4 µm) x 1 µm. They are Gram-positive, positive - catalase test, and motile. According to results of carotenoid extracted in methanol: chloroform với tỉ lệ 1: 2 v/v from 17 bacterial strains, it is noticed that all the extracts absorb wavelength from 400 – 600 nm. Therefore, these bacterial strains are proved to be likely to produce carotenoid. Three high-producing-carotenoid strains HT 8-1, HT 5-1 and HT 9-3 are 100% similar with Bacillus vietnamensis ANBU6, Bacillus arbutinivorans JPR85 và Bacillus indicus JG-30 .
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