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Does cold brew coffee has any better smell?
While higher temperatures improve solubility,
heat may degrade or evaporate some labile coffee chemicals
and they may precipitate out of solution when it cools off to room temperature.
Connoisseurs say you must wait at least 24 hours for a good cold brew coffee.
I think you can add some preservative to the water, and let it sit for several days.
I wonder if adding some surfactants to the water, yields a better coffee extraction.
@Chemist77 unfortunately the Dow local distributor here mostly sells agricultural chemicals.
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@Chemist77 - Dow here won’t talk to me because I can’t order the large minimum quantity they require. Teacher’s Supply in the USA has it.
@Gunther - I hadn’t thought of that and yes, it is an interesting idea. I will try it. Since it is not for internal use I see no reason not to add a surfactant. -
I tried cold brewing coffee
230 ml deionized water
150 mg SLS powder
mixture of finely and coarse ground coffee
and it gave a distinct reddish, brick like color.
The smell was nothing to write home about, but neither did hot brewing for that particular ground coffee.
I’ll try again with a more expensive, aromatic one, to see if it’s any better.Interesting study on coffee oils:
Topical use and systemic action of green and roasted coffee oils and ground oils in a cutaneous incision model in rats (Rattus norvegicus albinus)
AbstractIntroductionWounds are a common health problem. Coffee is widely consumed and its oil contains essential fatty acids. We evaluated the local (skin) and systemic effects associated with the topical use of coffee oils in rats.MethodsPunch skin wounds (6 mm) incisions were generated on the backs of 75 rats. Saline (SS), mineral oil (MO), green coffee oil (GCO), roasted coffee oil (RCO), green coffee ground oil (GCGO) or roasted coffee ground oil (RCGO) were topically applied to the wounds. Healing was evaluated by visual and histological/morphometric optical microscopy examination; second harmonics generation (SHG) microscopy, wound tissue q-PCR (values in fold-change) and blood serum (ELISA, values in pg/mL).ResultsRCO treated animals presented faster wound healing (0.986 vs. 0.422), higher mRNA expression of IGF-1 (2.78 vs. 1.00, p = 0.01), IL-6 (10.72 vs. 1.00, p = 0.001) and IL-23 (4.10 vs. 1.2, p = 0.05) in early stages of wound healing; higher IL-12 (3.32 vs. 1.00, p = 0.05) in the later stages; and lower serum levels of IFN-γ (11.97 vs. 196.45, p = 0.01). GCO treatment led to higher mRNA expression of IL-6 (day 2: 7.94 vs. 1.00, p = 0.001 and day 4: 6.90 vs. 1.00, p = 0.01) and IL-23 (7.93 vs. 1.20, p = 0.001) in the early stages. The RCO treatment also produced higher serum IFN-α levels throughout the experiment (day 2: 52.53 vs. 21.20; day 4: 46.98 vs.21.56; day 10: 83.61 vs. 25.69, p = 0.05) and lower levels of IL-4 (day 4: 0.9 vs.13.36, p = 0.01), adiponectin (day 10: 8,367.47 vs. 16,526.38, p = 0.001) and IFN-γ (day 4: 43.03 vs.196.45, p = 0.05). The SHG analysis showed a higher collagen density in the RCO and GCO treatments (p = 0.05).ConclusionTopical treatment with coffee oils led to systemic actions and faster wound healing in rats. Further studies should be performed are necessary to assess the safety of topical vegetal oil use for skin lesions.
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0188779 -
No problem @Belassi
In fact I’m thankful to you for posting them.
Teachersource looks greatPlease keep us posted on how their Polyox works in personal care products.
Right now I’m still surfing their site for some projects for my daughter’s science fair (and some for me).
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