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Experiments

PART I - ESTERASES and LIPASES Blablabla

PART II - KERATINASES Blablabla Semi-quantitative hair degradation assay To prove any enzyme activity a semi-quantitative hair degradation assay was performed. First, cultures of E. coli containing kerA, kerUS, kerP plasmid and one wild-type E. coli were grown o/n at 37°C in sterile LB broth. Chloramphenicol (final concentration 35 µg/mL) was added to the cultures containing kerA and kerUS – Kanamycin (final concentration 50 µg/mL) to the cultures containing the kerP. After incubation OD600 was measured before inducing cultures containing kerA and kerUS with IPTG with a final concentration of 1mM. Human hair was reduced to smaller pieces and then dried for 1 hour at 65°C. Afterwards the hair was distributed in 0.05 g aliquots and the full amount of each culture was added. The cultures + hair were incubated 120 hours at 37°C with slightly shaking. Skim milk plate assay This assay was performed to show qualitative enzyme activity. The different keratinases (kerA, kerUS and kerP) should degrade the casein in the milk, seen as clear zones around the cultures itself or the supernatant of the cells. Preparation of skim milk plates First 100 mL LB/agar (see methods) and 5 g skim milk powder in 125 mL distilled water was prepared. Both solutions were autoclaved and mixed after cooling down. For the plates used for kerA and kerUS cultures chloramphenicol (35 µg/mL) was added – in case of kerP kanamycin (50 µg/mL) was used to prepare plates. The plates were poured and stored at 4°C. Assay kerA/kerUS: Before spreading both keratinases on the plates, cells were induced with 1mM IPTG o/n at 37°C. After incubation 10 µL of the induced cell cultures and supernatant, cell culture without IPTG induction and a wild-type E. coli control was spread on skim milk plates containing chloramphenicol. The plates were incubated at room temperature for four days. kerP: 10 µL of cell culture, supernatant and a wild-type E. coli control was spread on skim milk plates containing kanamycin. The plates were incubated at room temperature for four days.

PART III - A LOVELY SCENT OF... ...ROSE FRAGRANCE Blablabla ...LIMONENE FRAGRANCE Blablabla